Illinois Postal Codes
Illinois, United States · 1,575 ZIP codes · 102 counties
Regions
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Interactive map of zip codes in Illinois. Just click on the location you desire for a postal code/address for your mails destination.
How to find a ZIP Code in Illinois
Not having the right zip code for your postal mail would mean your letters will not reach their destination. Click the location on the map to find your needed postal code or choose the county in the links above for a list of the zip codes available in Illinois.
Illinois Postal Code Information
About Illinois Postal Codes
Illinois uses the US 5-digit ZIP code system to help deliver mail efficiently. Our database covers 1,575 ZIP codes across 102 counties in Illinois. The largest counties by ZIP-code volume include Adams, Alexander, Bond. Use our lookup tool to find the correct postal code for any address in Illinois.
For example, Quincy in Adams County is recorded with the ZIP code 62301. Every county in the list above links to its places and ZIP codes.
How to Use
1. Choose a county from the Regions list above
2. Click the location on the map for a postal code
3. Or use the search box at the top of the page
4. View the exact delivery area on the map
Frequently Asked Questions about Illinois ZIP Codes
How do I find a ZIP code in Illinois?
Choose a county from the Regions list above to see all its places and ZIP codes, or click any location on the interactive map to get the postal code and full address for that point.
How many ZIP codes are there in Illinois?
Our database contains 1,575 ZIP codes across 102 counties in Illinois, sourced from GeoNames.org and OpenStreetMap.
What is the ZIP code format in Illinois?
ZIP codes in Illinois follow the standard US 5-digit numeric format (or 9 digits with ZIP+4). The first digit represents a group of states.
