US Area Code
312
Chicago · Illinois
Area code 312 serves Chicago, The Loop, River North and surrounding areas in Illinois. Look up any 312 number below to check for spam, see caller ID, carrier, and line type.
Area Code Details
- State / Territory
- Illinois
- Region
- Chicago
- Major Cities
- Chicago, The Loop, River North
- Timezone
- Central Time
- Country
- United States
- Format
- +1 (312) XXX-XXXX
Other Illinois area codes
217 Central Illinois224 Northern Illinois309 Central Illinois331 Chicago Suburbs447 East-Central Illinois464 South Cook County618 Southern Illinois630 DuPage County708 South/Southwest Suburbs730 Central Illinois773 Chicago779 Northern Illinois815 Northern Illinois847 North Cook / Lake County872 Chicago