Number Details

Cities in Area Code 312

Addison, Bensenville, Bridgeview, Buffalo Grove, Burr Ridge, Chicago, Elgin, Elk Grove, Elk Grove Village, Elmhurst, Hammond, Hickory Hills, Lombard, Mt Prospect, Naperville, Oak Brook, Schaumburg, Wheeling, Wood Dale

Metropolitan Statisitical Areas in Area Code 312

Chicago, Naperville, Joliet

Counties in Area Code 312

Cook, DuPage

States / Provinces


*Approximate area serviced by the 312 area code

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