Illinois Calling Codes
312, 773 & More
Calling Chicago or the suburbs? Illinois has a complex area code system. Whether it's 312 for Downtown or 630 for the suburbs, connect instantly from your browser.
How to Call Illinois Step-by-Step
Illinois requires 10-digit or 11-digit dialing due to the high density of phone numbers, especially in the Chicago metro area.
Country Code (+1)
Dial +1 or 001 if calling from outside North America.
Area Code
Dial the 3-digit area code.
312773630
See table below for correct code.
Local Number
Dial the 7-digit subscriber number.
Example: +1 312 555 0199
Understanding Chicago Area Codes
Chicago is unique because it splits area codes by geography within the city limits.
Illinois City & Region Guide
Find the correct area code for major Illinois cities.
| City | Region | Area Codes |
|---|---|---|
| Chicago (Downtown) | Cook County | 312 |
| Chicago (Neighborhoods) | Cook County | 773 |
| Chicago (Overlay) | Cook County | 872 |
| Aurora / Naperville | West Suburbs | 630 / 331 |
| Schaumburg / Evanston | North Suburbs | 847 / 224 |
| Joliet / Oak Lawn | South Suburbs | 708 / 464 |
| Rockford | Northern IL | 815 / 779 |
| Peoria / Bloomington | Central IL | 309 |
| Springfield / Champaign | Central IL | 217 |
| Belleville / Carbondale | Southern IL | 618 |
Why Use VoIP to
Call Illinois?
Connecting with business partners in Chicago or family in Springfield shouldn't be expensive. StartACall provides instant connectivity without carrier fees.
- Reach any 312, 773, or 630 number instantly
- No roaming charges for international callers
- High-quality voice for business calls
- Works on any browser, mobile or desktop
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Frequently Asked Questions
What is the area code for Downtown Chicago?
The area code for Downtown Chicago (The Loop) is 312. This is one of the original area codes and is highly recognizable.
What is the difference between 312 and 773?
312 covers the central business district (Downtown). 773 covers the rest of the city, including neighborhoods like Lincoln Park, Wrigleyville, and Hyde Park, as well as both O'Hare and Midway airports.
Do I need to dial 1 before the area code?
If you are calling from a landline within the US, you usually dial 1. If you are calling from a mobile phone or VoIP service like StartACall, you can just dial the 10-digit number (Area Code + Number), or +1 followed by the number.
What time zone is Chicago in?
Chicago and all of Illinois are in the Central Time Zone (CT). This is one hour behind New York (Eastern Time) and two hours ahead of Los Angeles (Pacific Time).
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