Can you help me with genealogical and naturalization research?

All of our original Naturalization documents are located at the Illinois Regional Archives Depository. 

To request information:

  • Mail
    • Illinois Regional Archives Depository
    • Founders Memorial Library, Rm. 245B
    • Northern Illinois University
    • Dekalb, IL  60115
  • Telephone
    • 815-753-1807

Please include as much information as possible in your request.

You may also contact the:

LaSalle County Genealogy Guild
115 West Glover Street
Ottawa, IL 61350

815-433-5261 or e-mail them at: This email address is being protected from spambots. You need JavaScript enabled to view it.

General requirements for naturalization include:

  • a period of continuous residence and physical presence in the United States;

  • residence in a particular district prior to filing;

  • an ability to read, write and speak English;

  • a knowledge and understanding of U.S. history and government;

  • good moral character;

  • attachment to the principles of the U.S. Constitution; and,

  • favorable disposition toward the United States.

All naturalization applicants must demonstrate good moral character, attachment, and favorable disposition. The other naturalization requirements may be modified or waived for certain applicants, such as spouses of U.S. citizens. Applicants should review the following materials and carefully read the  N-400  application instructions before applying.

If filing your N-400 by mail:

For Postal Service:
P.O. Box 4380
Chicago, IL  60680-4380

For FedEx, UPS and DHL deliveries:
Attn: N-400
131 S. Dearborn, 3rd Floor
Chicago, IL  60603-5517


Follow this link to the U.S. Citizenship and Immigration Services website to get the most updated information on Naturalization.

For further information, please refer to the Guide for New Immigrants, published by the USCIS.