Area Code 312 — Illinois
Area code 312 is located in Illinois and operates on Central Time . The largest city served is Chicago Zone 01-Calumet .
Coverage Area
Area code 312 — IllinoisArea Code Details
- Area Code
- 312
- State / Province
- Illinois (IL)
- Country
- United States
- Time Zone
- Central Time Central Time
- Local Time Now
- —
- Status
- Active
- Code Type
- General Purpose Code
- In Service Since
- January 1, 1947
- Assigned
- January 1, 1947
- Overlay Complex
- 312/872
Cities Served
History & Relationships
New codes split from 312
Rate Centers & Exchanges
8 rate centers identified within area code 312
Other Area Codes in Illinois
View all →Nearby Area Codes
Frequently Asked Questions About Area Code 312
What state is area code 312?
Area code 312 is located in Illinois, United States.
Where is area code 312 from?
Area code 312 originates from Illinois. It operates in the Central Time zone.
What time zone is area code 312?
Area code 312 falls within the Central Time zone (Central Time).
What cities are in area code 312?
Area code 312 serves cities including Chicago Zone 01-Calumet, Chicago Zone 01-Franklin, Chicago Zone 01-Lakeshore, Chicago Zone 01-Monroe, Chicago Zone 01-Superior, Chicago Zone 01-Wabash, Chicago Zone 01-Canal, Chicago Zone 01-Illinois Dearborn.
Is a call from area code 312 a scam?
Area code 312 is a legitimate general purpose code area code serving Illinois. Like any area code, individual numbers using 312 can be used for scam calls — always verify the specific number if you receive an unexpected or suspicious call.