Immigration is an essential aspect of the United States, and understanding the processes involved becomes vital for applicants. In this comprehensive guide, we focus on the USCISi-485) processing time at the Chicago IL Field Office, outlining each step and providing helpful advice for a smoother experience.


The Chicago IL Field Office is a crucial hub for processing various immigration applications, such as Form I-485 (employment and family-based adjustment applications), Form N-400 (Application for Naturalization), and Form N-600 (Application for Recognition of U.S. Citizenship). Gaining insights on the average processing times and factors influencing these periods can significantly improve your application process.

The Process at the Chicago IL Field Office

Upon receiving your application, the Chicago IL Field Office reviews the documents and, if necessary, arranges an interview. Being familiar with the office’s handling of each form, whether it’s Form N-400 or Form N-600, can help set realistic expectations and reduce uncertainty.

Average Processing Times

At the Chicago IL Field Office, the most recent average processing times are as follows:

FormCategoryOffice80% of cases are completed within
I-485Employment-based adjustment applicationsChicago IL14 Months
I-485Family-based adjustment applicationsChicago IL17.5 Months
N-400Application for NaturalizationChicago IL10 Months
N-600Application for recognition of U.S. citizenshipChicago IL9 Months

Note that these times may vary, so it’s essential to keep an eye on any updates.

Factors Influencing Processing Times

Several factors can influence processing times at the Chicago IL Field Office, such as:

  • Application volume: When the Field Office receives a high volume of applications, this can extend processing times.
  • Application complexity: More complex cases typically require additional reviews or background checks, leading to longer waiting periods.
  • Security clearances: Delays in obtaining security clearances can slow down the entire process.

Understanding these factors can help prepare you for possible delays and navigate the process more effectively.

How to Navigate the Process

To ensure a smoother experience at the Chicago IL Field Office, consider these tips:

  1. Stay organized: Gather and file all required documents accurately to reduce the chances of delays due to incomplete or incorrect information.
  2. Follow-up regularly: Regularly check your application’s status online, and maintain contact with the Field Office if you have any questions or concerns.
  3. Seek assistance: Organizations like Global Community Liaison Office offer resources and support to help with application processes.
  4. Consider mandamus: If you have a compelling need to expedite your case, explore the possibility of filing a writ of mandamus, which can push USCIS to make a decision more quickly.


By understanding the processing times and factors influencing them at the Chicago IL Field Office, you can be better prepared and navigate the process more effectively. Don’t forget to share your experiences or ask further questions to help others in their journey towards U.S. immigration.

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