312
Illinois (IL)
By Area Code
By State
All
200
300
400
500
600
700
800
900
Cities Covered by
312
Area Code
Buffalo Grove
Glenview
Harwood Heights
Willowbrook
Bensenville
Villa Park
Oak Lawn
Wheeling
Oak Brook
Des Plaines
Hinsdale
Rolling Meadows
Darien
Northbrook
Brookfield
Champaign
Cicero
Indianapolis
Algonquin
Country Club Hills
Evanston
Park Ridge
Western Springs
Lombard
Prospect Heights
Elmwood Park
Lincolnshire
Schaumburg
Deerfield
Plainfield
Lake Zurich
Aurora
Chicago
Clarendon Hills
Medinah
Oak Park
Blue Island
Crystal Lake
Barrington
Arlington Heights
Related Area Codes
217
,
312
,
618
,
630
,
708
,
773
,
815
,
224
,
847
,
317
,
331
,
608