Online Illinois Naturalization Records Indexes and Databases

Online Illinois Naturalization Records

Illinois Federal Naturalization Records, 1856-1991 at Ancestry/requires payment; for naturalizations done in federal courts; includes digitized images of the naturalization records from the Chicago branch of the National Archives; coverage varies by court; most are for after 1906.
Illinois: County Naturalization Records, 1800-1998 from FamilySearch/free (with registration); few records after 1945; does not include all counties; coverage varies by county. Does not include Cook County/Chicago. See the Cook County section below.

Online Illinois Naturalization Indexes and Records by County

Carroll County Naturalization Indexes
Clinton County Naturalization Records Index
Cook County and Chicago...
- Illinois, District and Circuit Court Naturalization Records, 1856-1991 from FamilySearch; includes naturalization records from the District and Circuit Courts in the Northern District of Illinois, Eastern Division, Chicago; coverage varies by court
- Cook County, Illinois Naturalization Database: Declarations of Intention Index, 1906-1929
- Digitized Chicago District Court Naturalization Petitions: Illinois, Northern District Petitions for Naturalization, 1906-1994 at FamilySearch These are digitized naturalization petitions from the District Court for the Chicago Division of the Northern District of Illinois.
- Also see the "Soundex Index to Naturalization Petitions for the United States District and Circuit Courts" listed below. It includes Cook County beginning with 1871.
- Chicago Voter Registration Records 1888-1892 may be helpful because they sometimes give the year and place of Naturalization (one of four Cook County Courts) for many of the foreign born voters (who had become citizens). They also give country (or state) of birth and the address of the voter. The time frame is significant as the 1890 census was destroyed.
  - Chicago Voter Registration Records, 1888 (at Ancestry/requires payment) also has Chicago Voter Registration Records for 1890 and 1892
- Note: Naturalization records for Cook County begin in 1871. The Cook County Naturalization records prior to that were destroyed in the Chicago fire.
- May be helpful: Chicago Genealogy Records and Sources on the Internet
DeKalb County Naturalization Certificates 100 years or older Requires registration. You can order copies of the records for a fee.
Some Hamilton County Naturalization Papers, 1863-1905 (includes images of the documents)
Iroquois County: Naturalization Records Indexes includes: Index of Declarations of Intent, 1867-1931; and Alphabetical Listing of Naturalized Citizens, 1868-1896
Jefferson County Declarations of Intention Index and Transcriptions of Some Naturalization Petitions
Macoupin County Naturalization Records
Madison County...
- Madison County Illinois Circuit Clerk Immigration and Naturalization Documents, 1850-1959
- Madison County: Naturalizations and Intentions of Madison County, Illinois, an Index 1816-1900 (scanned searchable book)
McLean County Naturalization Records from the McLean County Circuit Clerk
Montgomery County...
- Montgomery County Naturalization Index
- Montgomery County Naturalization records, 1862-1910 from FamilySearch; digitized images of the records from microfilm; not indexed
Morgan County: Some Naturalization Papers On File in the Morgan County Illinois Courthouse
Ogle County Court Naturalization Papers Index, 1872-1906
St. Clair County...
- St. Clair County: East St. Louis Naturalization Index Papers, 1874-1906
- St. Clair County: Index to Declarations and Naturalizations, Circuit Court, 1906 to 15 July 1918
- St. Clair County Naturalizations, 1838-1844
- For detailed information on finding St. Clair County Naturalization records see: Declarations and Naturalizations - St. Clair County, Illinois
Sangamon County Naturalization records, 1874-1906 from FamilySearch; digitized images of the records from microfilm
Sangamon County Naturalization Records, 1862-1864
Stark County, Circuit Court Naturalization Records, 1892-1913 from FamilySearch

Online Finding Aid/Index for Some Illinois Naturalization Records
For Illinois there is a soundex index available on microfilm from the National Archives (Microfilm Publication M1285). It is also indexed online at Ancestry and FamilySearch. For information see...

Soundex Index to Naturalization Petitions for the United States District and Circuit Courts, Northern District of Illinois, and Immigration & Naturalization Service District 9, 1840-1950

It covers the following Illinois counties: Boone, Bureau, Carroll, Champaign, Cook, DeKalb, DuPage, Ford, Fulton, Grundy, Henderson, Henry, Iroquois, Jo Daviess, Kane, Kankakee, Kendall, Knox, Lake, LaSalle, Lee, Livingston, Marshall, McHenry, McLean, Mercer, Ogle, Peoria, Putnam, Rock Island, Stark, Stephenson, Tazewell, Vermilion, Warren, Whiteside, Will, Winnebago, and Woodford. The 1840-1950 time frame varies by county.

Online Illinois Naturalization Records and Indexes