Cook County Clerk of the Circuit Court
Image Spacer for correct size distribution.
Clerk of the Circuit Court of Cook County, Illinois
Contact Information | Help |
Official image of Clerk Dorothy Brown
Records and Archives

Naturalization Searches
Room 1113 – Richard J. Daley Center
50 W. Washington
Chicago, IL  60602

Important Information about Naturalization Records


All naturalization records created in the Cook County Courts from 1871 to 1903 DO NOT contain the following data:

  • Date and town of birth
  • Ports of departure and arrival
  • Vessel of passage
  • Occupation
  • Information about wife and children

Information contained on the Soundex cards for pre-1904 Cook County naturalization records reflects almost all of the information contained in the actual records. The only exception occurs if the declaration of intent was filed in a non-Cook County court that required more specific information from the petitioner.

Declarations are usually attached to petitions in Cook County naturalization records. Pre-1904 declarations are not kept separately. Items marked “Court Order Only” on Soundex cards refer to the court order signed by the judge that naturalized the individual when the petition and declaration for that individual are no longer in existence.

Naturalization records from 1904 to October 1906 should but DO NOT always contain the following data:

  • Address
  • Town of birth
  • Date of birth
  • Date of arrival
  • Port of arrival and departure
  • Occupation
  • Witnesses

Naturalization records from October 1906 to 1929 reveal the same information as earlier records (1904 to October 1906) as well as the following data:

  • Wife’s name and date of birth (sometimes wife’s town of birth)
  • Children’s names, dates of birth, and town of birth
  • Physical description of petitioner (on declarations only)

Local Cook County courts stopped granting naturalizations in 1929.

Before 1906 wives and children were not named on naturalization papers of husbands or fathers, but they did receive derivative U.S. citizenship through these men. Only after September 22, 1922 did the law require married women to file for naturalization on their own.

On Soundex cards, the word “minor” next to the certificate number does not imply that the petitioner naturalized as a minor. Rather, this term denotes that the person arrived in the U.S. as a minor and then became a citizen sometime after reaching the age of 18 years. The Soundex cards often give the number of years the “minor” resided in the U.S. before naturalizing. Minors DID NOT file declarations of intention, and “minor” petitions provide virtually no genealogical information.

Due to the fact that declarations of intention (“first papers”) are haphazardly indexed, our staff cannot allot time to search for those specific records. Unless the individual filed a “minor’s petition” (see above), the declaration of intention is included with the petition (“second papers”).

Please read before requesting an offline search

Naturalization Search Form

© 2002 - 2017, Office of the Clerk of the Circuit Court of Cook County. (Terms & Conditions and Privacy Policy)
Check out our new Website!
We invite you to use and review our newly enhanced Clerk of the Circuit Court of Cook County Website, and we are eager to receive comments about your experience using our feedback link on the site.

The new Clerk of the Circuit Court of Cook County website features a streamlined format that is easier to use and includes an improved court case search function that enables users to find pertinent information easily and efficiently. Click here to test drive our new website, and remember to let us know what you think. Thank you!
Close this window and continue with our CLASSIC website.