The Ancestor Hunt regularly adds and updates new collection links, as well as searches for and fixes broken links.
(This page's most recent update is January 2025)
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Do you research naturalization records? No? Why not? Does the thought of going through paper files in dusty court basements turn you off? Well – I’m here to tell you that it is worth it – and with recent digitization efforts – more and more original documents have been scanned and made available via microfilm or online.
Some of the larger subscription sites have also made some source documents available – as well as index cards that can lead you to the court that handled the proceedings.
If you wish to get educated first about all of these documents and the naturalization process and how it has changed over time – please read these two terrific summaries:
- The U.S. Archives Naturalization Records
- FamilySearch’s Wiki entry United States Naturalization and Citizenship
- Women and Naturalization
Okay – now that you are educated and know that post-1906 – about 4 awesome documents just drip with great information: Declaration of Intent, Petition for Citizenship or Naturalization, Certificate of Arrival, and the Certificate of Naturalization. Many of the online genealogy websites may not have all of these documents available but do have index cards that are searchable – which have information regarding the court handling the proceedings. With this information, you might be able to track down some of the source documents.
Below is a list of links to free online naturalization record and index collections for the state:
Note: Some links listed take you to a FamilySearch Collection of digital images. Near the bottom of the page under Film/Digital Notes is the name of each sub-collection. If there is a camera icon at the right of the name (in the Format column) then the collections’ images are browsable. If there is a camera with a key icon, it is only available at a Family History Center or affiliated library. If there is a film reel icon, then it is only available in microfilm format, not digital. To take full advantage make sure that you are logged in to FamilySearch. The results may be different if you are signed in, rather than not.
Maine Naturalization Records
- Androscoggin County Naturalization Records Index 1931-1944
- Androscoggin County Admission to Citizenship 1895-1906
- Androscoggin County Application to take Oath of Allegiance 1940-1970
- Androscoggin County Certificates of Naturalization 1900-1907
- Androscoggin County Naturalization Records, 1870-1972; Index, 1895-1972
- Androscoggin County Naturalization Records, 1895-1906
- Androscoggin County Petition and Record 1909-1974
- Androscoggin County, Auburn, Naturalization Records
- Androscoggin County, Lewiston, Naturalization Records
- Aroostook County Naturalization Records, 1839-1991
- Aroostook County, Caribou, Naturalization Records
- Aroostook County, Houlton, Naturalization Records
- Aroostook County, Houlton, Naturalization Records
- Bath, Seamen’s Proofs of Citizenship, 1833-1868
- Calais, Alphabetical Manifest Cards of Alien Arrivals, Ca. 1906-1952
- Cumberland County Declarations of Intentions 1859-1906
- Cumberland County Naturalization Docket Book 1868-1906
- Cumberland County Naturalization Index 1859-1906
- Cumberland County Naturalization Records 1859-1906
- Cumberland County, Naturalization Records
- Cumberland County, Portland, Court of Common Pleas, Naturalization Records, 1790-1839
- Cumberland County, Portland, Naturalization Records, 1918-1991
- Cumberland County, Portland, Superior Court Naturalization Records
- Cumberland County, Portland, United States Circuit Court, Naturalization Records, 1851-1906
- Cumberland County, Portland, United States District Court, Naturalization Records, 1790-1901
- Fort Fairfield, Alphabetical Manifest Cards of Alien and Citizen Arrivals, ca., 1909-April 1953
- Franklin County Naturalization Records 1932-1941
- Franklin County, Farmington, Naturalization Records
- Franklin County, Supreme Judicial Court, Naturalization Records, 1901-1906
- Hancock County Naturalization Records 1845-1958
- Hancock County, Ellsworth, Naturalization Records
- Immigrants to New England, 1700-1775
- Index to New England Naturalization Petitions, 1791-1906
- Jackman, Alphabetical Manifest Cards of Alien Arrivals, ca., 1909-1953
- Kennebec County Naturalization Records 1895-1990
- Kennebec County, Augusta, Naturalization Records
- Kennebec County, Waterville, Naturalization Records
- Knox County Naturalization Records 1860-1958
- Knox County, Rockland, Naturalization Records
- Lewiston Final Papers of Naturalization (Lewiston, 1883-1893
- Lewiston Record of Intention of Naturalization 1882-1893
- Lincoln County, Naturalization Records, 1790-1955; Index 1790-1913, 1790-1954
- Lincoln County, Wiscasset, Common Pleas Court, Naturalization Records
- Lincoln County, Wiscasset, District Court, Naturalization Records
- Lincoln County, Wiscasset, Supreme Judicial Court, Naturalization Records
- Maine Counties Naturalization Records Index
- Maine Passports, 1828-1851
- Maine, Alien Registrations
- Maine, County Naturalization Records, 1800-1990
- Maine, Manifests of Alien Arrivals, 1906-1953
- Maine, Rhode Island, New York, and Connecticut Passenger Lists, 1820-1874
- Maine, State Archive Collections, 1718-1957
- Maine, United States Naturalization Records, 1918-1991
- Maine, Indexes to Naturalization Records of Federal Courts, Portland, 1851–1955
- Maine, Naturalization Records 1790-1945
- Mars Hill , Records of Marriages, Marriage Intentions, Naturalizations, Births and Deaths, 1786-1942
- New England Petitions for Naturalization Index, 1791-1906
- New England, Petitions for Naturalization, 1787-1906
- Oxford County Naturalization Records 1900-1974
- Oxford County, South Paris, Court of Common Pleas, Naturalization Records
- Oxford County, South Paris, Supreme Judicial Court, Naturalization Records
- Oxford County, South Paris, Western District Court, Naturalization Records
- Penobscot County Naturalization Records 1834-1958
- Penobscot County, Bangor, Common Pleas Court, Naturalization Records
- Penobscot County, Bangor, Eastern District Court, Naturalization Records
- Penobscot County, Bangor, Naturalization Records, 1942-1984
- Penobscot County, Bangor, Supreme Judicial Court, Naturalization Records
- Piscataquis County Naturalization Records 1838-1958
- Piscataquis County, Dover-Foxcroft, Eastern District Court, Naturalization Records
- Piscataquis County, Dover-Foxcroft, Supreme Judicial Court, Naturalization Records
- Sagadahoc County Naturalization Records 1850-1955
- Sagadahoc County, Bath, Supreme Judicial Court, Naturalization Records
- Sagadahoc County, Supreme Judicial Court, Naturalization Records, 1860-1906
- Somerset County, Skowhegan, Common Pleas Court, Naturalization Records
- Somerset County, Skowhegan, Middle District Court, Naturalization Records
- Somerset County, Skowhegan, Supreme Judicial Court, Naturalization Records
- United States, Border Crossings from Canada to United States, 1895-1956, Index
- United States, New England Seamen’s Identification Cards, 1918-1940
- Van Buren, Alphabetical Manifest Cards of Alien Arrivals, ca. 1906-1952
- Vanceboro, Alphabetical Manifest Cards of Alien Arrivals, ca. 1906-December 24, 1952
- Waldo County Naturalization Records 1930-1957
- Waldo County, Belfast, Common Pleas Court, Naturalization Records
- Waldo County, Belfast, Eastern District Court, Naturalization Records
- Waldo County, Belfast, Supreme Judicial Court, Naturalization Records
- Washington County Naturalization Records
- Washington County Washington County Courthouse Records, 1785-1950
- Washington County, Machias, Common Pleas Court, Naturalization Records
- Washington County, Naturalization Records, 1839-1945
- Washington County, Supreme Judicial Court Case Files, 1821-1908
- Woodland Town and Vital Records, 1874-1892
- York County Naturalization Records 1904-1955
- York County, Alfred, Circuit Court, Naturalization Records
- York County, Alfred, Common Pleas Court, Naturalization Records
- York County, Alfred, Saco Municipal Court, Naturalization Records
- York County, Alfred, Supreme Judicial Court, Naturalization Records
- York County, Alfred, Western District Court, Naturalization Records
Good Luck and Happy Hunting!