Chicago, Illinois
Central Time Zone (UTC-6) · IL · —
312
⬡ 1947
Chicago
Illinois
Central
+1
773
1996
Chicago
Illinois
Central
Split
+1
872
2009
Chicago
Illinois
Central
Overlay
464
2024
Chicago
Illinois
Central
Overlay
708
1989
Cicero
Illinois
Central
Split
+1
About Area Codes in Chicago, Illinois
Chicago, Illinois is served by 5 area codes: 312, 773, 872, 464, 708. When multiple area codes serve the same geographic area, it typically indicates overlay codes have been added to accommodate growing demand for phone numbers. All local calls within Chicago require 10-digit dialing. The city is in the Central time zone (UTC-6).
Other cities in area code 312
Frequently Asked Questions
What area code is Chicago, Illinois?
Chicago, Illinois uses area codes 312 and 773 and 872 and 464 and 708.
What time zone is Chicago in?
Chicago is in the Central time zone (UTC-6).
Do I need to dial 10 digits when calling Chicago?
Yes, all local calls in Chicago require 10-digit dialing because the area is served by multiple overlay area codes.
When was area code 312 created?
Area code 312 is one of the original 86 area codes established in 1947 as part of the North American Numbering Plan (NANP).
What cities share area code 312 with Chicago?
Other cities sharing area code 312 with Chicago include Albany Park, Austin, Avondale, Berwyn, Beverly, among others.
Chicago, IL · Central Time Zone