Online Illinois Naturalization Records Indexes

Illinois Naturalization Records at Ancestry
  • 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
Online Illinois Naturalization Indexes and Records by County Online and Offline Finding Aid for 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...

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.

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