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.

About area code 312: location, common spam callers, related area codes, and more. Includes 312 reverse phone lookup to identify spam callers.

Mar 9, 2025 · 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. …

Area code 312 is located in Illinois. Get the area’s map, cities covered, current time, prefixes, and dialing instructions.

Nov 1, 2025 · 312 Area Code located in Illinois, including 16 cities, 3 counties, 1 time zone, map, Census demographics, and 778 active prefixes.

Oct 15, 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.

The 312 Area Code is located in the state of Illinois. Area Code 312 is one of the 269 three-digit telephone area codes in the USA. It covers roughly 7,859,286 unique phone numbers and …

Find 312 area code details including city, time zone, and map. Lookup area code 312 phone number, name, and location.

We've have collected info regarding the area code 312 in this page, which helps with a phone number search. Here, you'll find the location, time zone, cities and other information regarding …

Area code 312 is located in Illinois and includes Chicago. View the 312 area code map, major cities, location, timezone and more on TeraCodes.com.