Area Code 3xx Directory
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Area Code 312 Information Details
About Area Code 312:
The 312 Area Code (or Area Code 312) is located in the state of MO. Area Code 312 is one of the 269 3-digit telephone area codes in the USA. It covers roughly 1.63 million unique phone numbers and 5.08 million individuals near the city of Saint Louis
Country United States
State / Territory Illinois - IL
Capital City Chicago
Time Zone Central
Majorcities:
Chicago, IL