Oregon Genealogy

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Oregon Genealogy Research Guide

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Oregon Genealogy Research Guide

Quick Facts

Oregon entered the Union on February 14, 1859 as the thirty-third state, after an unusually layered period of provisional and territorial government. The Oregon Country was held jointly by the United States and Great Britain until the Oregon Treaty of 1846 fixed the boundary at the 49th parallel; settlers had already organized their own Provisional Government at Champoeg in 1843, and Congress created Oregon Territory in 1848. Each of those governments left its own records, so knowing which one was in charge in a given year is the first step in finding them.

• Capital: Salem. Oregon City served as the first territorial capital; the seat of government moved to Salem in 1851, briefly to Corvallis in 1855, and back to Salem later that same year.
• Statehood: February 14, 1859, the thirty-third state, formed from Oregon Territory, which Congress created on August 14, 1848 and which originally reached north and east to take in present-day Washington and Idaho.
• Counties: 36. The Provisional Government created the first four districts in 1843 — Twality (later Washington), Yamhill, Clackamas, and Champooick (later Marion); the last county, Deschutes, was created in 1916.
• Land type: Oregon is a federal (public-domain) state, not a state-land state. Title to nearly all land passed from the United States to its first private owner by patent, issued through the General Land Office, so federal land records are central to Oregon research. Land is described by township, range, and section under the rectangular survey, measured from the Willamette Meridian and its initial point, the Willamette Stone, established in 1851.
• Nickname and motto: the Beaver State; the state motto is Alis volat propriis (“She flies with her own wings”), which was displaced for part of the twentieth century by the motto “The Union.”
• Where records live: deeds and marriages are recorded by the county clerk, and probate and most other case files belong to the county’s court; statewide civil registration of births and deaths did not begin until 1903, and the Oregon State Archives holds large bodies of transferred county, territorial, and provisional records.

Libraries and Archives

Oregon’s research collections cluster in Salem, which holds the state government’s records, and in Portland, home to the largest public library, the historical society, and the leading genealogical society; county courthouses and local historical societies hold material for their own areas. The principal Oregon repositories include:

• Oregon State Archives (Salem) — provisional and territorial government records, county records transferred from courthouses, vital-record indexes, land claim files, naturalizations, tax rolls, and military records.
• Oregon State Library (Salem) — Oregon histories, published genealogies, newspapers, city directories, and census microfilm.
• Oregon Historical Society Research Library (Portland) — manuscripts, photographs, maps, church records, early census and tax records, and Indian War pension files.
• Genealogical Forum of Oregon (Portland) — a large genealogical library, publisher of the standard abstracts of the Oregon donation land claims, with extensive free online indexes.
• Oregon Genealogical Society (Eugene) — a statewide society with a research library and published indexes.
• Multnomah County Library (Portland) — the state’s largest public library, with a substantial genealogy and local history collection.
• City of Portland Archives & Records Center — the city’s municipal records, including council, police, health, and public works files.
• National Archives at Seattle — the federal repository for Oregon: federal court and naturalization records, Chinese Exclusion Act case files, Bureau of Indian Affairs records, and land entry papers.
• University of Oregon Special Collections and University Archives and the Oregon State University Special Collections and Archives Research Center — manuscript collections documenting Oregon families, businesses, and communities.
• Oregon Jewish Museum and Center for Holocaust Education, the Japanese American Museum of Oregon, and Oregon Black Pioneers — the leading repositories for Jewish, Japanese American, and Black Oregonian family history.
• The FamilySearch Library and its worldwide FamilySearch Centers hold extensive Oregon microfilm and digital collections, and county clerks, circuit courts, county historical societies, and tribal enrollment offices hold records for their own communities.

Major Websites

These sites host digitized Oregon records and indexes. Subscription sites are marked ($).

• FamilySearch — free; the backbone finding aid, with the FamilySearch Wiki, catalog, and large digitized collections of Oregon vital, land, probate, court, church, and naturalization records.
• Ancestry ($) — extensive Oregon vital, census, probate, naturalization, military, and land collections.
• MyHeritage ($) — Oregon vital records, censuses, newspapers, and immigration collections.
• Findmypast ($) — Oregon marriage and other vital-record indexes.
• Oregon State Archives genealogy records — free; the gateway to the Archives’ research aids, and to the Oregon Historical Records Index, which searches birth, death, marriage, divorce, probate, land claim, naturalization, census, and military entries drawn from the Archives’ holdings.
• Oregon Historical County Records Guide — free; a county-by-county inventory of which record series survive and where they are held. It is the essential first stop before writing to any courthouse.
• Historic Oregon Newspapers — free; full-text searchable Oregon newspapers from 1846 onward, hosted by the University of Oregon.
• Bureau of Land Management General Land Office Records — free; federal land patents, survey plats, and field notes, the starting point for land research in this public-domain state.
• Chronicling America — free; the Library of Congress newspaper archive.
• Internet Archive and HathiTrust — free; digitized Oregon histories, published record abstracts, and law books.
• Find a Grave and BillionGraves — free; cemetery listings, photographs, and transcriptions.

Law and Government

Oregon’s statutes explain the jurisdictions and record-keeping practices that produced its genealogical records — who could claim land, who could marry, which court kept which file, and, notoriously, who was permitted to settle in the state at all. The foundational volumes are digitized and free to read.

• Laws of a General and Local Nature Passed by the Legislative Committee — the Organic Laws and acts of the Provisional Government, the earliest body of Oregon law; free on the Internet Archive.
• The Statutes of Oregon — the territorial code, covering the courts, probate, marriage, and land claims; free on the Internet Archive.
• The Organic and Other General Laws of Oregon, 1843–1872, compiled by Matthew P. Deady and Lafayette Lane — the standard compilation of provisional, territorial, and early state law; free on HathiTrust.
• The Codes and General Laws of Oregon (William Lair Hill) and The Codes and Statutes of Oregon (Bellinger and Cotton) — the later codifications that governed courts and probate into the twentieth century; free on the Internet Archive.
• The Oregon Encyclopedia explains the Oregon Donation Land Act and the state’s exclusion laws, two bodies of law that determined who appears in Oregon’s records and who was kept out of them.
• The Oregon State Archives holds the provisional, territorial, and legislative records themselves, and the Oregon Blue Book sets out the constitutional and governmental framework.

Vital Records (Birth, Marriage, Death)

Statewide civil registration of births and deaths began in July 1903; the state began receiving copies of marriages in 1906 and of divorces in 1925. Everything earlier is a county or municipal record, and pre-1903 coverage is thin and uneven, which makes church registers, censuses, and the donation land claim files the working substitutes for most nineteenth-century families.

Before the state system. Counties recorded marriages from the time they were organized, some from 1849, and scattered county birth and death registers survive from the 1860s onward. Portland ran its own municipal registration well before the state did: the city’s births (roughly 1881–1902) and deaths (roughly 1881–1917) are indexed as a separate series held with the Oregon State Archives, so a Portland event in those years should be sought there rather than in the state files.

Access. Certified copies of the more recent records are issued by the Oregon Health Authority’s Center for Health Statistics, for a fee, and are not open records: births are restricted to the registrant’s immediate family, and deaths to those with a direct and tangible interest. Older records open for research — births after about a century, and deaths, marriages, and divorces after about half a century — and pass to the Oregon State Archives. Use the indexes below to identify a record, then order it.

• Births: Oregon, Oregon State Archives, Births, 1842–1917 is free on FamilySearch and is also on Ancestry ($); Oregon Births and Christenings, 1868–1929 is free on FamilySearch and also on MyHeritage ($).
• Marriages: Oregon County Marriages, 1851–1975 — the main series, recorded by the county clerks — is free on FamilySearch and indexed on Ancestry ($). For the state series, see Oregon State Marriages, 1906–1971 ($) and the Oregon Marriage Indexes, 1906–2009 ($).
• Deaths: Oregon, Death Index, 1903–1998 and Oregon, Oregon State Archives, Death Records, 1864–1967 are free on FamilySearch; Oregon State Deaths, 1864–1971 ($) and the Oregon Death Index, 1898–2008 ($) are on Ancestry, and Oregon Deaths, 1903–1930 ($) is on MyHeritage.
• County births and deaths: Oregon County Births and Deaths, 1855–1949 ($) gathers the registers the counties kept before and alongside the state system, and Oregon Deaths and Delayed Births is free on FamilySearch.
• Divorces: before 1853 divorce was granted by the territorial legislature, and those records are at the Oregon State Archives; afterward divorces were heard in the circuit court of each county. Oregon County Divorce Records, 1917–1948 ($) and Oregon State Divorces, 1925–1968 ($) are on Ancestry, and Oregon Marriages and Divorces ($) is on MyHeritage.
• The free Oregon Historical Records Index searches births, delayed births, Portland births, deaths, coroner’s reports, marriages, and divorces together, and is the quickest way to learn whether the Archives holds a given record.

History and Timeline of Major Events

Key dates that shaped Oregon’s jurisdictions and records:

• 1805–1806 — Lewis and Clark reach the mouth of the Columbia and winter at Fort Clatsop.
• 1811 — The Pacific Fur Company founds Astoria, the first American settlement on the coast.
• 1825 — The Hudson’s Bay Company establishes Fort Vancouver and dominates the fur trade of the Oregon Country.
• 1834 and 1838 — Jason Lee opens a Methodist mission in the Willamette Valley, and the Catholic priests Blanchet and Demers arrive and found the mission at St. Paul. Their registers are the earliest surviving vital records for many families.
• 1843 — Settlers organize the Provisional Government at Champoeg and create the first four districts; the Great Migration brings the first large wagon trains over the Oregon Trail.
• 1846 — The Oregon Treaty settles the boundary with Great Britain at the 49th parallel.
• 1847–1848 — The killings at the Whitman mission touch off the Cayuse War.
• August 14, 1848 — Congress creates Oregon Territory.
• 1850 — The Donation Land Claim Act offers free land to settlers and generates the single richest body of Oregon genealogical records.
• 1851 — The Willamette Stone is set as the initial point of the Willamette Meridian, and the rectangular survey of Oregon begins.
• 1853 — Washington Territory is separated, reducing Oregon Territory toward its present bounds.
• 1855–1856 — The Rogue River Wars end with the removal of the western Oregon tribes to the Grand Ronde and Siletz reservations.
• December 1855 — Fire destroys the territorial statehouse at Salem, together with many of the territory’s public records, only weeks after the building was occupied.
• 1857 — The constitutional convention meets; voters approve a constitution that bars slavery and also bars Black people from settling in the state.
• February 14, 1859 — Oregon is admitted as the thirty-third state.
• 1862 — The Homestead Act opens the land remaining after the donation claims; Oregon’s Civil War regiments garrison the frontier rather than fight in the East.
• 1872–1873 — The Modoc War is fought in the lava beds of the far south.
• 1883 — Transcontinental rail service reaches Portland, ending the wagon-road era and accelerating immigration.
• 1887 — Chinese miners are massacred in Hells Canyon, one of several episodes of anti-Chinese violence.
• 1916 — Deschutes County, the last of the thirty-six, is created, and Congress revests the Oregon and California Railroad land grant in the United States.
• 1935 — The second state capitol burns at Salem, destroying and damaging state agency records.
• 1942 — Japanese American Oregonians are forcibly removed, assembled in Portland, and incarcerated at Minidoka and Tule Lake.
• 1948 — A Columbia River flood destroys Vanport, then the state’s second-largest city, displacing thousands of residents, a large share of them Black.

Census Records and Substitutes

Federal censuses were taken every ten years, and Oregon appears in all of them from 1850 through 1950 — in 1850 as Oregon Territory, which then included country that later became other states. The 1890 federal population schedule was almost entirely destroyed, but the 1890 special schedule of Union veterans and widows does survive for Oregon and partly fills the gap. Federal censuses are free on FamilySearch and on the National Archives 1950 census site, and are searchable on Ancestry ($) and MyHeritage ($); the 1890 Veterans Schedules ($) are indexed separately.

Territorial and state censuses are an Oregon strength, because they were taken almost annually in the territorial years. Enumerations were made in 1842, 1843, 1845, 1849, 1853, 1854, 1855, 1856, 1857, 1858, 1859, 1865, 1875, 1885, 1895, and 1905, but only portions survive, and survival is county by county rather than statewide. Most name only the head of each household. The Oregon Historical Records Index inventories what the Archives holds, and most surviving schedules are on microfilm through the FamilySearch Library. What each year offers:

• 1842: a list of persons living south of the Columbia River — among the earliest name lists for the Oregon Country.
• 1843: the Elijah White census, taken as the Provisional Government was being organized.
• 1845: enumerations of several districts, with a separate listing for Tuality, the district that became Washington County.
• 1849: a count of males over twenty-one in several counties, useful as a voting-age list on the eve of the territorial land laws.
• 1850: the federal census, taken of Oregon Territory, serves as the enumeration for this year.
• 1853, 1854, 1855, 1856, 1857, 1858, and 1859: near-annual territorial enumerations, each surviving for a shifting handful of counties — 1854 for Benton, Clatsop, and Jackson among others, 1855 for Coos and Jackson, and 1859 for Clatsop and Umpqua. Taken together they can place a family in a specific county almost year by year through the 1850s.
• 1865, 1875, and 1885: state censuses that generally name only the head of the household, with counts of the other residents; these survive for scattered counties.
• 1895 and 1905: the most valuable of the state censuses, because they record information about every member of the household rather than only its head.

Substitutes. Where a census is missing, the donation land claim files serve as a de facto census of the settled parts of the territory in the early 1850s, naming the claimant, the spouse, and the date of arrival. City directories (on Ancestry, $), county tax rolls, and elector and voter registrations at the Oregon State Archives place a family in a given town and year. The Early Oregonians Index, 1800–1860 ($) and the Oregon Compiled Census Index, 1841–1890 ($) draw many of these scattered early lists together.

Church Records

Because civil registration is so late, church registers are the most important substitute for vital records before 1903, and for the mission era they are the only records at all. The Roman Catholic mission founded by Blanchet and Demers in 1838 produced registers of baptism, marriage, and burial that reach back to the fur-trade families of French Prairie; the Methodist mission of 1834 is nearly as early, and Presbyterian, Congregational, Baptist, Episcopal, and Quaker congregations followed with the overland migration.

• Oregon Church and Cemetery Records, 1840–1965 ($) — the broadest single online collection of Oregon congregational and burial registers.
• Oregon, Church Records, 1853–1874 — free on FamilySearch.
• Catholic: registers are held by the parish or by the Archdiocese of Portland in western Oregon and the Diocese of Baker in the east. The early registers of Vancouver, St. Paul, and the other mission stations are transcribed and published in the multi-volume Catholic Church Records of the Pacific Northwest, the standard printed source for fur-trade and French Prairie families of mixed Native and European descent.
• Methodist: the records of the mission and the later conference are held at the Mark O. Hatfield Library at Willamette University, and the Oregon Historical Society holds a Methodist church collection.
• Quaker: the Northwest Yearly Meeting of Friends records are at the George Fox University archives.
• Jewish: congregational records, beginning with Congregation Beth Israel in Portland, are at the Oregon Jewish Museum and Center for Holocaust Education.
• Thousands of individual congregational registers are catalogued by county and town in the FamilySearch Catalog, and the Oregon Historical Society holds many originals and transcriptions.

Court Records

Oregon’s courts changed with each layer of government, and their records reach well beyond lawsuits into estates, guardianships, divorces, naturalizations, adoptions, and name changes. The courts a researcher meets are:

• Provisional Government courts (1843–1849) and the territorial district and supreme courts (1848–1859) — their surviving records are at the Oregon State Archives, described in its provisional and territorial records guide.
• Circuit Court, the county-level court of general jurisdiction since statehood — civil and criminal cases, divorce, adoption, name changes, and the naturalizations filed before the process was federalized. It also holds probate in most counties.
• County Court — historically the probate court as well as the county’s governing body. The 1969 probate code moved probate jurisdiction to the circuit courts in every county except Gilliam, Grant, Harney, Malheur, Sherman, and Wheeler, where the county court keeps it.
• Justice and municipal courts for minor matters, and the Oregon Supreme Court and Court of Appeals above them.

The Oregon Historical County Records Guide lists, county by county, which court series survive and whether they remain at the courthouse or have come to the Archives; modern case information is available through the Oregon Judicial Department. Two useful court-generated collections are online: Oregon Adoptions and Name Changes, 1876–1918 ($), and FamilySearch Full-Text Search, which makes many unindexed court and land documents searchable by every name they contain.

Ethnic/Minority Records

Oregon’s law actively shaped who settled here and who was recorded, so knowing a group’s history points directly to the records most likely to document a family.

• Indigenous peoples. The Chinook, Clatsop, and Tillamook lived along the lower Columbia and the coast; the Kalapuya and Molalla in the Willamette Valley; the Umpqua, Coos, Coquille, Siuslaw, and Takelma in the south and southwest; the Klamath and Modoc in the south; and the Cayuse, Umatilla, Walla Walla, Nez Perce, Wasco, Warm Springs, and Northern Paiute east of the Cascades. Treaties and wars in the 1850s forced removals onto the Grand Ronde, Siletz, Warm Springs, Umatilla, and Klamath reservations; several tribes were terminated in the 1950s and later restored. The National Archives at Seattle holds the Bureau of Indian Affairs records, including agency censuses, allotment and heirship files, and school records, and the tribes hold their own enrollment records — the Confederated Tribes of Grand Ronde, the Confederated Tribes of Siletz Indians, the Confederated Tribes of Warm Springs, the Confederated Tribes of the Umatilla Indian Reservation, and the Klamath Tribes among them. Catholic mission registers from Grand Ronde and Siletz are an important supplement.
• Black Oregonians. Oregon excluded Black settlers by law — the lash law of 1844, a territorial statute of 1849, and a clause in the 1857 constitution — and the Black population remained very small for decades as a result. Communities grew with the railroads, and then sharply during the Second World War around the Portland shipyards and the wartime city of Vanport, destroyed by flood in 1948, after which many residents moved into Portland’s Albina district. Oregon Black Pioneers is the leading resource, with the Oregon Historical Society and Portland’s Black newspapers.
• Chinese Oregonians. Chinese miners and laborers arrived from the 1850s for the gold fields, the railroads, and the canneries, with large communities in Portland and John Day. The richest genealogical source is the body of Chinese Exclusion Act case files at the National Archives at Seattle, which often document a family across generations; see the National Archives guide to Chinese American records. Portland, Oregon Chinese Immigrant Landing Records and Applications for Admission, 1882–1903 ($) is indexed online.
• Japanese Oregonians. Issei settled in Portland and farmed the Hood River valley from the 1890s. Forced removal in 1942 sent Oregon families through the Portland assembly center to Minidoka and Tule Lake; the War Relocation Authority records are federal, and the Japanese American Museum of Oregon and the Densho Digital Repository hold community records, oral histories, and camp documentation.
• European and Latino communities. Finns and Scandinavians settled Astoria and the lower Columbia fisheries; Germans, Volga Germans, and Russian Old Believers farmed the Willamette Valley; Basque herders worked the southeastern rangeland; and Mexican and Mexican American farmworkers became central to Willamette Valley agriculture in the twentieth century. Their records are largely church, newspaper, and society records held by the Oregon Historical Society and the university archives.

Immigration and Naturalization

Oregon was settled overland rather than through a great seaport: most nineteenth-century arrivals came by the Oregon Trail from the Missouri River, and there are no passenger manifests for a wagon train. Trail research therefore depends on diaries, published emigrant rosters, and the arrival dates recorded in the donation land claim files. Portland and Astoria did operate as customs ports, and later arrivals by sea and from Canada are documented.

• Oregon Passenger and Crew Lists, 1888–1956 — free on FamilySearch; also on Ancestry ($) as the Oregon arriving passenger and crew lists.
• Border crossings from Canada into the Pacific Northwest are indexed on the subscription sites and free on FamilySearch, and matter for families who entered through British Columbia.
• The Chinese Exclusion Act case files at the National Archives at Seattle are, in effect, the immigration records for Chinese Oregonians, and are far more detailed than an ordinary manifest.

Naturalization. Before 1906 any court of record could naturalize, so Oregon declarations and petitions are scattered through the county circuit and county courts; after 1906 the process was federalized and the papers were filed with the federal court. The National Archives at Seattle holds the federal court naturalizations for the District of Oregon, and the Oregon Historical Records Index is free and indexes many county naturalization entries. Online collections include Oregon Naturalization Records, 1868–1991, free on FamilySearch, and, on Ancestry, Oregon Naturalization Records, 1865–1991 ($) and Oregon County Court Naturalization Records, 1840–1982 ($). Because the donation land laws required citizenship or a declared intention to become a citizen, a claim file will often reveal exactly where and when an immigrant ancestor filed his papers.

Land Records

Oregon is a public-domain state: the United States, not the state, owned the land and granted it to the first private owner by patent. Every parcel therefore has a federal origin, and the federal case file behind that patent is usually far richer than the county deed that follows it. Land is described by township, range, and section, measured from the Willamette Meridian, whose initial point — the Willamette Stone — was set in 1851; the surveyor general’s office opened at Oregon City and district land offices followed at Roseburg, The Dalles, La Grande, Burns, Lakeview, and elsewhere.

The main ways land was acquired.

• Provisional land claims (1845–1849). Before the United States extended its land system, settlers filed claims with the Provisional Government’s recorder. These describe the land and often name the adjoining claimants. The claims were later voided and had to be refiled, but the records survive on microfilm at the Oregon State Archives and are abstracted in the Genealogical Forum of Oregon’s Oregon Provisional Land Claims.
• The Donation Land Claim Act of September 27, 1850. This is the defining Oregon land law and the single richest genealogical source in the state. It granted 320 acres to a single white male citizen aged eighteen or over who had arrived before December 1, 1850, and 640 acres to a married couple — with the wife holding half in her own name, one of the earliest American laws to let a married woman hold land in her own right, which means Oregon wives are named in the land records generations before they appear anywhere else. Those arriving between December 1850 and December 1853 received half those amounts. Four years’ residence and cultivation were required. “American half-breed Indians” were eligible; Black settlers and Hawaiians were expressly excluded. The act expired on December 1, 1855. A claim file can name the claimant and spouse, the date and place of their marriage, the date of arrival in Oregon, the previous residence, and the claimant’s citizenship or declaration of intent.
• The Homestead Act of 1862 and the later Timber Culture Act and Timber and Stone Act, which were used heavily — and notoriously abused by speculators — in the Oregon timber country. Preemption claims, cash entries, and military bounty land warrants also transferred land, and each generated a federal case file.
• The Oregon and California Railroad grant. Congress granted the railroad a checkerboard of sections through the western Oregon valleys in 1866, on the condition that the land be sold in small tracts to actual settlers at a low fixed price. The company broke those terms, and in 1916 Congress revested the unsold grant lands in the United States; the “O&C lands” are federal to this day. Where an ancestor bought from the railroad rather than from the government, the deed — not a patent — is the first record of title. Wagon-road companies received similar grants, among them the Oregon Central Military Road and the Willamette Valley and Cascade Mountain Wagon Road.
• State school and swamp lands, granted to Oregon at statehood and sold to settlers, are administered by the Oregon Department of State Lands; allotments on the reservations are documented in the Bureau of Indian Affairs records at the National Archives at Seattle.

Where the records are kept. Once land was patented, every later transfer was recorded as a deed or mortgage by the county clerk, and the deed books remain at the courthouse, with many series inventoried in the Oregon Historical County Records Guide and some transferred to the Archives. The federal layer is held by the National Archives and the Bureau of Land Management.

• BLM General Land Office Records — free; search federal land patents by name to find the tract, the land office, and the authority under which it was granted, and to view survey plats and field notes.
• The donation land claim files were microfilmed as the Oregon and Washington donation land files; the Genealogical Forum of Oregon publishes a free donation land claims index, and its printed abstracts, Genealogical Material in Oregon Donation Land Claims, are searchable on Ancestry ($). The Oregon State Archives describes the federal land records and their microfilm.
• U.S. Homestead Records, 1863–1908 ($); the BLM tract books and the cancelled, relinquished, and rejected land entry case files are free on FamilySearch and catch the many claims that never ripened into a patent.
• The free Oregon Historical Records Index includes land claim and married women’s property entries, and FamilySearch Full-Text Search makes many unindexed deeds and land papers searchable by every name they contain, including grantors, grantees, witnesses, and neighbors.

Military Records

Oregon’s military records are dominated less by the national wars than by the frontier conflicts fought on its own ground, and the state’s own service records are often the best place to begin.

• Indian wars and territorial militia: the Cayuse War (1847–1848), the Rogue River Wars (1851–1856), the Modoc War (1872–1873), the Bannock and Snake wars, and other campaigns were fought largely by companies of Oregon Volunteers raised locally. The Oregon State Archives holds the muster and service records and an index to Indian War veterans, and the Oregon Historical Society holds the Indian War pension files. Frances Fuller Victor’s The Early Indian Wars of Oregon prints many of the muster rolls and is free on the Internet Archive.
• Civil War: the 1st Oregon Cavalry and the 1st Oregon Infantry garrisoned forts, reservations, and emigrant roads rather than serving in the East. Oregon Civil War Service Records of Union Soldiers is free on FamilySearch. Many Oregon men had earlier served in eastern regiments before migrating, so a negative search here is not conclusive.
• Spanish-American War and Philippine Insurrection: the 2nd Oregon Volunteer Infantry served in the Philippines; see Oregon Volunteers, Spanish American War and Philippine Insurrection ($), drawn from the published official record of the Oregon volunteers.
• First World War: Oregon World War I County Military Service Records, 1919–1920 and Oregon World War I Veteran State Aid Applications, 1921–1938 are free on FamilySearch, alongside the nationwide draft registration cards.
• Across the conflicts: Oregon State Military Records, 1847–1977 ($) indexes the state’s own military files across more than a century, and Oregon Military Discharge Records, 1919–1967 — discharges filed with the county clerks — is free on FamilySearch. The Oregon State Archives military records guide describes the state’s holdings, including the Oregon Soldiers’ Home at Roseburg.

Probate Records

Probate — wills, administrations of intestate estates, and guardianships of minors — is among the richest sources for family relationships, and in a state whose vital records begin only in 1903 it often supplies the proof of kinship that no certificate can. The estate file, rather than the will alone, is the document to seek: the petition, inventory, bond, claims, and final account together usually name the widow and every heir.

• Provisional and territorial years: probate was handled by the probate courts of the Provisional Government and then of the territory; those records are largely at the Oregon State Archives.
• From statehood: the county court in each county proved wills, granted administrations, and appointed guardians.
• Since the 1969 probate code: probate jurisdiction sits with the circuit court in every county except Gilliam, Grant, Harney, Malheur, Sherman, and Wheeler, where the county court retains it. When looking for a twentieth-century estate, this is the dividing line that tells you which court to ask.

Estate files remain at the courthouse in many counties, while others have been transferred to the Archives; the Oregon Historical County Records Guide says which, county by county, and the free Oregon Historical Records Index covers probate, estate, and guardianship entries. Online, Oregon Wills and Probate Records, 1849–1963 ($) is name-searchable across most counties, and FamilySearch Full-Text Search makes many unindexed wills and estate files searchable by every name they contain.

Tax Records

Tax rolls place a family in a specific county and year, and because they were made annually they fill the gaps between censuses; several consecutive years can reveal when a young man came of age, when a household moved, and when a widow took over her husband’s land. For the provisional and territorial period, the tax lists are among the earliest name lists Oregon has, and they stand in for the censuses that did not survive.

• County assessment and tax rolls are the main series. They were kept by the county assessors, and a substantial run from the 1840s through 1900 has been transferred to the Oregon State Archives; the rest stay with the county. The Oregon Historical County Records Guide lists the surviving tax rolls county by county, and the free Oregon Historical Records Index covers tax roll and poll tax entries.
• Provisional and territorial tax lists of the 1840s and 1850s survive for scattered counties and are held with the Oregon State Archives and among the Oregon Historical Society’s early census and tax records.
• U.S. IRS Tax Assessment Lists, 1862–1918 ($) — the Civil War income, license, and luxury taxes, which for the Oregon district run past the war and into the 1870s; the 1862–1874 assessment lists are free on FamilySearch.