State · United States

Illinois Postal Codes

—1286 counties

Browse by county to find postal codes in Illinois.

Understanding postal codes in Illinois

Postal code format varies by country (often 4–6 digits; some use alphanumeric).

Select a county to explore postal codes.

State · United States

—1286 counties

Browse by county to find postal codes in Illinois.

Postal code format varies by country (often 4–6 digits; some use alphanumeric).

Select a county to explore postal codes.