O'Brien County IA Census Records
USA (1,379,301) > Iowa (43,684) > O'Brien County (301) > O'Brien County Census Records (66)
USA (1,379,301) > Iowa (43,684) > Iowa Census Records (6,172) > O'Brien County Census Records (66)
NOTE: Additional records that apply to O'Brien County are also on the Iowa Census Records page.
| Countywide | Archer | Baker | Caledonia | Carroll in O'Brien County | Center in O'Brien County | Franklin in O'Brien County | Hartley | Primghar | Sanborn | Sheldon | Summit |
O'Brien County Census Records
1856 Iowa State Census (part of Iowa State Census collection) Ancestry 
1860 Federal U.S. Census MyHeritage
1860 U.S. Federal Census Ancestry
1870 Federal U.S. Census MyHeritage
1870 U.S. Federal Census Ancestry
1880 Federal U.S. Census MyHeritage
1880 U.S. Federal Census Ancestry
1885 Iowa State Census (part of Iowa State Census collection) Ancestry
1895 Iowa State Census (part of Iowa State Census collection) Ancestry
1900 Federal U.S. Census MyHeritage
1900 U.S. Federal Census Ancestry
1905 Iowa State Census MyHeritage
1905 Iowa State Census (part of Iowa State Census collection) Ancestry
1910 Federal U.S. Census MyHeritage
1910 U.S. Federal Census Ancestry
1915 Iowa State Census (part of Iowa State Census collection) Ancestry
1920 Federal U.S. Census MyHeritage
1920 U.S. Federal Census Ancestry
1925 Iowa State Census (part of Iowa State Census collection) Ancestry
1930 Federal U.S. Census MyHeritage
1930 U.S. Federal Census Ancestry
1940 Federal U.S. Census MyHeritage
1940 U.S. Federal Census Ancestry
1950 United States Federal Census MyHeritage
1950 United States Federal Census Ancestry
Census 1870, 1880 US Gen Web Archives
Federal Census 1880 US Gen Web Archives
Federal Census of 1940, Grant in O'Brien County, Iowa LDS Genealogy
Federal Census of 1940, Highland in O'Brien County, Iowa LDS Genealogy
Federal Census of 1940, Liberty in O'Brien County, Iowa LDS Genealogy
Federal Census of 1940, Lincoln in O'Brien County, Iowa LDS Genealogy
Federal Census of 1940, Omega, Iowa LDS Genealogy
Federal Census of 1940, Union in O'Brien County, Iowa LDS Genealogy
Federal Census of 1940, Waterman, Iowa LDS Genealogy
Federal Population Census of the U.S. 1790-1940 Archives.com
Iowa, State Census Collection, 1836-1925 Ancestry
State Census 1895 Town of Sanborn, Summit Twp US Gen Web Archives
U.S. Federal Census 1790-1950 Ancestry
U.S. Federal Census 1790-1950 MyHeritage
United States Federal Census, 1790-1950 Family Search
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