312 S Jackson St Jackson Mi. Get the most exact information on time zones here. The 312 a

Get the most exact information on time zones here. The 312 area code serves Chicago, Willowbrook, Elgin, Arlington Heights, Naperville, covering 23 ZIP codes in 4 counties. Lookup area code 312 phone number, name, and location. Includes 312 reverse phone lookup to identify spam callers. 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. Jan 1, 2026 · 312 Area Code located in Illinois, including 16 cities, 3 counties, 1 time zone, map, Census demographics, and 778 active prefixes. To start a free reverse phone lookup, simply enter the full 10-digit number (including the 312 area code) below and access available caller information such as name, address, and more. Below, are the major cities in the area code (312). No credit card required! 5 days ago · The largest city it serves is Chicago. Lookup information on Area Code 312 - get demographic, NPA NXX, and other data by area code Area Code 312 Map and Data Area Code 312 Profile Area Code 312 Boundary Map + − Leaflet | ©Zipdatamaps ©OpenStreetMap Contributors.

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