All Sources

Declarations of Intention for Citizenship, 1906 - 1911. Textual Records. 9 Boxes. NAID: 12024204. Records of District Courts of the United States, Record Group 21. National Archives at Chicago, Chicago, Illinois.

Petitions for Naturalization, 1906 - 1991. Textual Records. 22 Boxes and 27 Volume. NAID: 6756404. Records of District Courts of the United States, Record Group 21. National Archives at Chicago, Chicago, Illinois.

Declarations of Intention for Citizenship, 1903 - 1981. Textual Records. 8 Boxes. NAID: 6756420. Records of District Courts of the United States, Record Group 21. National Archives at Chicago, Chicago, Illinois.

Petitions for Naturalization, 1906 - 1991. Textual Records. 1395 Boxes and 175 Volumes. NAID: 593882. Records of District Courts of the United States, Record Group 21. National Archives at Chicago, Chicago, Illinois.

Naturalization Petitions, 1872 - 1902. Textual Records. 1 Box. NAID: 1225038. Records of District Courts of the United States, Record Group 21. National Archives at Chicago, Chicago, Illinois.

Declarations of Intention for Citizenship, 1906 - 1951. Textual Records. 4 Boxes. NAID: 12024215. Records of District Courts of the United States, Record Group 21. National Archives at Chicago, Chicago, Illinois.

Petitions for Naturalization, 1906 - 1911. Textual Records. 28 Boxes. NAID: 12024211. Records of District Courts of the United States, Record Group 21. National Archives at Chicago, Chicago, Illinois.

Soundex Index to Naturalization Petitions for the United States District and Circuit Courts, Northern District of Illinois and Immigration and Naturalization Service District 9, 1840-1950.. Microfilm Publication: M1285. NAID: 1160705. Records of the Immigration and Naturalization Service, 1787 - 2004, Record Group 85. National Archives at Chicago, Chicago, Illinois.

Updates:
11 Sep 2020: Added 1,487,862 new records from the Illinois Northern District.