Mountainside Genealogy (in Union County, NJ)
USA (1,379,301) > New Jersey (19,659) > Union County (1,478) > Mountainside (45)
NOTE: Additional records that apply to Mountainside are also found through the Union County and New Jersey pages.
Mountainside Birth Records
New Jersey Births and Christenings Index, 1660-1931 Ancestry 
New Jersey, Birth Records, 1848-1920 New Jersey State Archives
New Jersey, Birth Records, 1921-present New Jersey Department of Health
Mountainside Cemetery Records
Community Presbyterian Church Memorial Garden Find a Grave
New Jersey Deaths and Burials Index, 1798-1971 Ancestry
Mountainside Census Records
1855 New Jersey, State Census Ancestry
1865 New Jersey, State Census Ancestry
1875 New Jersey, State Census Ancestry
1885 New Jersey, State Census Ancestry
1895 New Jersey, State Census Ancestry
1905 New Jersey, State Census Ancestry
1915 New Jersey, State Census Ancestry
Federal Census of 1940, Mountainside, New Jersey LDS Genealogy
U.S. Federal Census 1790-1950 Ancestry
U.S. Federal Census 1790-1950 MyHeritage
United States Federal Census, 1790-1950 Family Search
Mountainside Church Records
New Jersey Births and Christenings Index, 1660-1931 Ancestry
Mountainside City Directories
Barton-Wand City of Plainfield, Borough of North Plainfield, Westfield, Mountainside, Dunellen, Fanwood and Scotch Plains Directory 1907 Westfield Memorial Library
Plainfield (New Jersey) city directories FamilySearch Library
Polk's Westfield (Union County, N. J.) City Directory Including Cranford, Garwood, Kenilworth and Mountainside 1961-1962, 1964-1966, 1968-1969, 1971-1980, 1982 Cranford Public Library
Richmond's Directory of Plainfield, North Plainfield, Westfield, Mountainside, Dunellen, Fanwood and Scotch Plains (New Jersey) 1912-1922, 1924 Westfield Memorial Library
Wand's City of Plainfield, Borough of North Plainfield, Westfield, Mountainside, Dunellen, Fanwood and Scotch Plains Directory 1903-1905, 1911 Westfield Memorial Library
Westfield (Union County, N. J.) City Directory Including: Cranford, Garwood, Kenilworth and Mountainside 1974-1980, 1982 Westfield Memorial Library
Westfield and Mountainside City Directory 1922 MyHeritage
Westfield and Mountainside City Directory 1924 MyHeritage
Westfield and Mountainside City Directory 1928 MyHeritage
Mountainside Death Records
1901-1903, 1920-1929, 1949-2000 New Jersey Death Index Ancestry
1920-1929, 1949-2017 New Jersey Death Index MyHeritage
New Jersey Deaths and Burials Index, 1798-1971 Ancestry
New Jersey, Death Records, 1848-1930 New Jersey State Archives
New Jersey, Death Records, 1931-present New Jersey Department of Health
Mountainside Histories and Genealogies
History of the Borough of Mountainside, Union County, New Jersey, 1895-1945 Ancestry
History of the Borough of Mountainside, Union County, New Jersey, 1895-1945 FamilySearch Library
Mountainside Immigration Records
Declarations of intention, 1857-1928 FamilySearch Library
Naturalization certificate stubs : 1914-1930 FamilySearch Library
Naturalization petitions, 1857-1906 FamilySearch Library
Mountainside Land Records
Deeds, 1857-1935 FamilySearch Library
Mountainside Marriage Records
1670-1965 New Jersey Marriage Records (selections) Ancestry
1901-1914 New Jersey Marriage License Index MyHeritage
1901-2016 New Jersey Marriage Index Ancestry
1915-2016 New Jersey Marriage License Index MyHeritage
New Jersey Marriages, 1684-1895 Ancestry
New Jersey, Marriage Records, 1848-1930 New Jersey State Archives
New Jersey, Marriage Records, 1931-present New Jersey Department of Health
Mountainside Probate Records
1785-1924 New Jersey, Wills and Probate Records Ancestry
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