Summary
Area code 312 serves part of Chicago, IL and is an enclave area code, similar to area code 514 in Montreal and area code 210 in San Antonio. It is roughly bounded by North Avenue on the north, Western Avenue on the west, and 35th Street on the south, with Lake Michigan to the east.
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It overlaps coverage areas with area code 872.
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It was split in 1996 into 773.
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Both area codes are overlaid with area code 872. 312 is an enclave area code, similar to area code 514 in Montreal and area code 210 in San Antonio. It…
Area code 312 - Wikipedia
wikipedia.org
Summary
The area code 312 is one of the original 86 area codes created by AT&T and the Bell System in 1947. 312 was created to serve the Chicago metropolitan area, which includes Cook County and the city of Chicago, before it was split in 1996 into 773.
Chicago Local Phone Numbers - All area Codes 312, 773, 708 - Ooma
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Area Code 312 phone numbers State: Illinois In service since: 1947 Landlines: 532 Wireless prefixes: 240 Carriers: 44 Counties: 4 ZIP codes : 23 Major cities: Chicago, Willowbrook, Elgin, Arlington Heights,…
312 Area Code Phone Numbers | Whitepages
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