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