Note: the databases listed here are free to search except those marked "requires payment."
General...
- Selected U.S. Naturalization Records - Original Documents, 1790-1974 at Ancestry (requires payment) includes digitized naturalization records for some Federal courts in California (Los Angeles and San Diego), New York (Southern District), Pennsylvania (Philadelphia and Pittsburgh); coverage varies by state; click the link for more details and to see which courts are included
- U.S. Naturalization Records Indexes, 1794-1995 at Ancestry (requires payment) includes Naturalization indexes for some Federal courts in Alaska, California (San Francisco area), Delaware, District of Columbia, Maryland, Massachusetts, Michigan (Detroit), New York, Ohio (Cleveland), Oregon, and Pennsylvania (Pittsburgh area); coverage varies by state; click the link for more details and to see which courts are included
Alabama...
Arkansas...
California...
Colorado...
Delaware...
Idaho...- Idaho Naturalization Index downloadable Excel file; for Ada, Alturas, Canyon, Clearwater, Elmore, Oneida, Teton & Twin Falls Counties, and the Idaho Supreme Court
Illinois...
Indiana...
Iowa...
- Cerro Gordo County: Mason City Naturalization Index - Petitions and Declarations, 1942-1961 U.S. District Court, Northern District of Iowa, Central Division
- Jasper County Naturalization Index 1887-1895
- Lee County: Keokuk - Index to Miscellaneous Records Pertaining to Naturalization, 1840-1888 U.S. District Court, District of Iowa, Southern Division
- Linn County, Iowa Superior Court Naturalizations
- Union County: Creston Naturalization Index - Declarations and Petitions, 1930-1951 U.S. District Court, Southern District of Iowa, Southern Division
- Wapello County: Ottumwa Naturalization Index - Petitions and Declarations, 1916-1951 U.S. District Court, Southern District of Iowa, Ottumwa Division
Kansas...
- Assorted Kansas Naturalization Indexes, U.S. District Court includes...
- Fort Scott Naturalization Index to petitions and declarations, 1915-1967
- Kansas City Naturalizations: name index to naturalization records, 1948-1970
- Kansas Indian Naturalizations, name index to Indians naturalized in Kansas, ca. 1865-1874
- Topeka Naturalization Index to declarations of intention ("first papers"), 1852-1942
- Topeka Index to overseas naturalization petitions, 1943-1954
- Topeka Index to naturalization petitions, 1868-1984
Kentucky...
Louisiana...
Maryland...
Massachusetts...
Michigan...
- Indexes to Naturalization Records in the Michigan State Archives includes the following counties: Allegan, Alpena, Antrim, Barry, Bay, Chippewa, Clare, Clinton, Crawford, Delta, Dickinson, Eaton, Genesee, Grand Traverse, Huron, Iosco, Iron, Kalamazoo, Kent, Lake, Lapeer, Lenawee, Mackinac, Macomb, Marquette, Mason, Newaygo, Ontonagon, Otsego, Ottawa, St. Clair & Sanilac County
Minnesota...
Missouri...
- Missouri Naturalization Indexes from the Kansas City National Archives Branch includes U.S. District Court indexes for:
- Cape Girardeau Petitions, Name index to naturalization petitions ca. 1908-1979
- Hannibal Petitions, Name index to naturalization petitions ca. 1907-1973
- Jefferson City Petitions, Name index to naturalization petitions ca. 1938-1982
- Joplin Petitions, Name index to naturalization petitions ca. 1931-ca. 1969
- Springfield Petitions, Name index to naturalization petitions ca. 1911-ca. 1983
- St. Joseph Petitions, Name index to naturalization petitions ca. 1908-1976
Nebraska...
- Assorted Nebraska Naturalization Indexes, U.S. District Court includes...
- Chadron Division, Name Index to Naturalization Records, Including Declarations and Petitions, 1930s-1940s
- Grand Island Petitions, Name index to naturalization petitions ca. 1930-1951
- Hastings Petitions, Name Index to Naturalization Petitions ca. 1931-1951
- Lincoln Petitions, Name index to naturalizations petitions ca. 1932-1980
- McCook Division, Name Index to Naturalization Records, Including Declarations and Petitions, 1930s-1940s
- Norfolk Petitions, Name index to petitions ca. 1929-1942
- North Platte Petitions and Declarations, Name index to petitions and declarations of intent ca. 1930-1951
- Omaha Petitions, Name index to petitions ca. 1867-1991
New Jersey...
New York...
North Dakota...
Ohio...
- Cleveland Area: Naturalization Petition and Record Books for the US District Court for the Northern District of Ohio, Eastern Division, Cleveland, 1907-1946
 includes digitized images from National Archives Microfilm Publication M1995 (searches are free; requires payment to download the images) this database is not yet complete, but more records are being added
- Cuyahoga County Naturalization Indexes includes Common Pleas Court 1818-1931 & Probate Court 1859-1901
- Hamilton County Ohio (Cincinatti) Citizenship Records, 1837-1916 includes transcriptions of original and restored Declarations of Intention to Naturalize and Naturalization papers filed in Hamilton County between circa 1837 and 1916. While a great number of these records were lost, "a significant number survived and others were restored."
- Lake County, Ohio Naturalization Index
- Lawrence County Naturalization Indexes 1819-1906 some years missing
- Miami County Naturalization Records 1860-1872
- Stark County Naturalization Records Index (about Sept 1906 and later) includes downloadable PDF images of the naturalization papers
- Summit County Ohio Naturalization Records Search includes PDF images
- Warren County, Ohio Naturalizations, 1821-1925
- Also See: Finding Naturalization Records in Cincinnati & Hamilton County, Ohio
Oregon...
- Oregon Naturalizations assorted years & counties: Benton, Clackamas, Curry, Hood River, Jackson, Josephine, Linn, Marion, Polk, Tillamook, Umatilla, Wasco & Yamhill
- Oregon Naturalization Indexes includes: US District Courts in Medford, Pendleton & Portland, plus Morrow, Union & Wasco Counties (assorted years 1906 and later)
Pennsylvania...
South Carolina...
South Dakota...
Tennessee...
Texas...
Utah...
Virginia...
Washington...
- State of Washington Naturalization Records
For the following Washington Counties: Adams, Benton, Chelan, Clark, Columbia, Cowlitz, Douglas, Ferry, Franklin, Grant, Grays Harbor, Island, Jefferson, King, Kitsap, Kittitas, Klickitat, Lewis, Lincoln, Mason, Okanogan, Pacific, Pierce, San Juan, Skagit, Skamania, Snohomish, Spokane, Thurston, Wahkiakum, Whatcom and Yakima County, and the Washington Supreme Court Register (also be sure to look around the site for other Washington State records)
Wisconsin...
Wyoming...
Canada...
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