Illinois Calling Codes
312, 773 & More
Need to reach Chicago or the suburbs? Illinois runs a layered area code system. From 312 Downtown to 630 in the suburbs, place the call from your browser and pay one low per minute rate.
Dialing Illinois in Three Simple Steps
Phone numbers are so dense across the Chicago metro that Illinois moved to 10-digit or 11-digit dialing. The steps below cover it, and every minute stays cheap with pay as you go pricing.
Country Code (+1)
Begin with +1, or 001 when you are calling from beyond North America.
Area Code
Add the matching 3-digit area code.
312773630
Check the table below for the right code.
Local Number
Finish with the 7-digit subscriber number.
Example: +1 312 555 0199
How Chicago Splits Its Area Codes
Chicago stands out because it divides its area codes by location inside the city limits.
Illinois City and Region Lookup
Match the right area code to each major Illinois city.
| 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 |
Cut the Cost of
Calling Illinois
Reaching business partners in Chicago or relatives in Springfield should not drain your wallet. Intercalling connects you in seconds at a low per minute rate, with no carrier fees attached.
- Dial any 312, 773, or 630 number right away
- Skip the roaming surcharges when you call from abroad
- Crisp audio that holds up on business calls
- Runs in any browser, on mobile or desktop
Save Money
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Frequently Asked Questions
Which area code covers Downtown Chicago?
Downtown Chicago, known as The Loop, uses 312. It is one of the original area codes and stays instantly recognizable.
How do 312 and 773 differ?
312 sits over the central business district Downtown. 773 takes in the rest of the city, including neighborhoods such as Lincoln Park, Wrigleyville, and Hyde Park, plus both O'Hare and Midway airports.
Should I dial 1 ahead of the area code?
From a US landline you normally press 1 first. From a mobile or a VoIP service like Intercalling you can simply enter the 10-digit number (area code plus number), or +1 and then the number.
Which time zone does Chicago follow?
Chicago, along with the rest of Illinois, runs on Central Time (CT). That puts it one hour behind New York on Eastern Time and two hours ahead of Los Angeles on Pacific Time.
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