Area codes in Chicago, Illinois
Chicago, Illinois uses 3 area codes — 312, 773 and 872. The main Chicago area code is 312.
Area codes serving Chicago
Phone numbers in Chicago are written as ten digits — for example (312) 555-0190 — and fall in the Central Time zone.
All Illinois area codes · Is a Chicago call a scam?
Nearby cities
- Evanston area codes
- Hammond area codes
- Gary area codes
- Schaumburg area codes
- Naperville area codes
- Joliet area codes
- Valparaiso area codes
- Kenosha area codes
More cities in Illinois
- Rockford area codes
- Champaign area codes
- Champaign-Urbana area codes
- Decatur area codes
- DeKalb area codes
Frequently asked questions
What is the area code for Chicago?
The main area code for Chicago, Illinois is 312. Chicago is now served by 3 area codes in total: 312, 773, 872.
How many area codes does Chicago have?
Chicago has 3 area codes: 312, 773, 872.
Why does Chicago have more than one area code?
As Chicago used up the numbers available in its original area code (312, in service since 1947), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.
How do you dial a Chicago number?
Dial all 10 digits — the area code (312 or 773 or 872) followed by the 7-digit local number. From abroad, dial +1, then the area code and number.
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of August 2, 2026. Refreshed monthly.