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312 Area Code Phone Directory

Phone Prefixes in the 312 Area Code

(312) 2XX (312) 3XX (312) 4XX (312) 5XX (312) 6XX (312) 7XX (312) 8XX (312) 9XX

Information for Area Code 312

State: IL

Largest City in Area: CHICAGO

Where is Area Code 312?

Area code (312) is in the state of IL. Below, are the major cities in the area code (312).

Area Codes Starting with 3

Major Cities in 312

CHICAGO, IL (2,009,539)

EVANSTON, IL (59,550)

OAK PARK, IL (47,220)

NEW YORK, NY (47,102)

NAPERVILLE, IL (40,576)

SKOKIE, IL (31,552)

DES PLAINES, IL (31,472)

ARLINGTON HEIGHTS, IL (28,329)

SCHAUMBURG, IL (28,066)

HIGHLAND PARK, IL (28,054)

Zip Codes in 312

60601

60602

60603

60604

60605

60606

60607

60608

60609

60610

60611

60612

60613

60614

60615

60616

60617

60618

60619

60620

60621