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