Illinois ZIP Codes
Looking for the zip code of Illinois USA? Browse every ZIP code in Illinois by city below — our growing collection of Illinois city pages including Chicago, Springfield, Peoria. Pick a city to see its complete ZIP code list, or use our free tools to look up any address.
Cities in Illinois with ZIP Code Pages
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About Illinois ZIP Codes
Illinois ZIP codes cover every corner of the state — from major metro areas to small towns. Each city page lists every ZIP code in that city, sorted numerically, with county information and answers to common questions. If you are unsure which ZIP code belongs to your street address, our ZIP Code by Address tool finds it instantly.
Frequently Asked Questions
How do I find the ZIP code for a city in Illinois?
Pick the city from the list above to see every ZIP code in that city. For a street address, use our ZIP Code by Address tool.
How many ZIP codes does Illinois have?
Illinois has hundreds of ZIP codes across its cities and towns. The cities listed above show 148 ZIP codes in total — and the list keeps growing.
What is the ZIP+4 code for my Illinois address?
Use our free ZIP+4 Lookup tool — enter your Illinois street address to get the full 9-digit code.
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