312 area code is located in Illinois. Illinois has area codes of 217 , 224 , 630 , 847 , 309 , 815 , 708 , 773 , 618

The following is the cities / towns that use 312 area code.

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Where is 312 area code?

The following map shows the locations of 312 area code. This map has zip code level precision. Each dot on the map represents one zip code that use 312 as area code.