Area code 312 - Wikipedia
Area code 312 is a telephone area code in the North American Numbering Plan for the city of Chicago, including downtown, the Chicago Loop, and its immediate environs.
312 Area Code - Location map, time zone, and phone lookup
Where is area code 312? Area code 312 serves part of Chicago, IL. It overlaps coverage areas with area code 872.
Area Code 312 phone numbers - Whitepages
Browse area code 312 phone numbers, prefixes and exchanges. The 312 area code serves Chicago, Willowbrook, Elgin, Arlington Heights, Naperville, covering 23 ZIP codes in 4 counties.
312 area code — information, time zone, map
2 days ago · 312 is an area code located in the state of Illinois, US. The largest city it serves is Chicago. Find out where 312 area code zone from, which states, counties and cities it covers. Get the most …
312 Area Code - Map, Phone Lookup, Time Zone - Wirefly
Find 312 area code details including city, time zone, and map. Lookup area code 312 phone number, name, and location.
312 Area Code: Complete Location Info, Time Zone
Nov 22, 2025 · Area code 312 is in Illinois, USA. Locate phone numbers 312-200-XXXX through 312-999-XXXX. City list with local time, map and overlaying areas.
312 Area Code - National Phone Number Registry
Jan 3, 2026 · Area code 312 is located in Illinois. Get area code location and dialing plans for all phone prefixes in area code 312.
Area Code 312 - Illinois - Zipdatamaps
List of ZIP Codes in Area Code 312 ... List of Counties in Area Code 312 Cook County
312 area code - Area Code Book
Area code 312 is located in the Central Standard Time (CST) time zone. This designation indicates the predominant time zone for calls made within this area code.
312 Area Code: Understanding Its Significance and Usage
Oct 8, 2024 · Understanding the 312 area code is crucial for businesses and residents in the Chicago area. This guide has provided comprehensive information on the 312 area code, including its history, …