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Area Code 312

Where does the 312 area code belong?

STATE
Illinois
TIME ZONE
Central Time
MAJOR CITY
Chicago

The 312 Area Code (or Area Code 312) is located in the state of MO. Area Code 312 is one of the 269 3-digit telephone area codes in the USA. It covers roughly 1.63 million unique phone numbers and 5.08 million individuals near the city of Saint Louis

Area Code 312 History

Area code 312 was put into service. In 1989 Area code 312 was split to form area code 708. In 1996 area code 312 was split again to form area code 773. In 2009 area code 312 was overlaid with area code 872.

Following cities also use area code 312:

Chicago, Hinsdale, La Grange Park, Northbrook, Roselle, Wheeling.

ZIP codes in Area Code 312:

60001 (Alden)
60002 (Antioch)
60004 (Arlington Heights)
60005 (Arlington Heights)
60006 (Arlington Heights)
60007 (Elk Grove Village)
60008 (Rolling Meadows)
60009 (Elk Grove Village)
60010 (Barrington)
60011 (Barrington)

Big city in area code 312

Chicago

COUNTY
Cook
POPULATION
2,699,382
Source: WorldAtlas.com
NUMBER OF PREFIXES
783
NUMBER OF CELLPHONES
366,899
NUMBER OF LAND LINES
1,046,017
MEDIAN HOME VALUE
$157K
MEDIAN INCOME
$89.3K
Source: WorldAtlas.com

Browse Area Code (312) Prefixes

PREFIX COUNTY CITY CARRIER TYPE
312-349 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-350 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-351 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-352 DuPage Hinsdale New Cingular Wireless Pcs, Llc - IL Wireless
312-353 Cook Chicago Ameritech Illinois Landline
312-354 DuPage Roselle New Cingular Wireless Pcs, Llc - IL Wireless
312-355 Cook Chicago Ameritech Illinois Landline
312-356 Cook Chicago Ameritech Illinois Landline
312-357 Cook Chicago Ameritech Illinois Landline
312-359 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-360 Cook Chicago Ameritech Illinois Landline
312-361 Cook Chicago Ameritech Illinois Landline
312-362 Cook Chicago Ameritech Illinois Landline
312-363 Cook Chicago Rcn Telecom Services Of Illinois, Inc. - IL Landline
312-364 Cook Chicago Ameritech Illinois Landline
312-365 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-366 Cook La Grange Park New Cingular Wireless Pcs, Llc - IL Wireless
312-367 Cook La Grange Park Usa Mobility Wireless, Inc. Wireless
312-368 Cook Chicago Ameritech Illinois Landline
312-369 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-370 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-371 Cook Chicago Sprint Spectrum L.p. Wireless
312-372 Cook Chicago Ameritech Illinois Landline
312-373 Cook Chicago Broadwing Communications, Llc - IL Landline
312-374 Cook Chicago Ameritech Illinois Landline
312-375 Cook Chicago T-Mobile Usa, Inc. Wireless
312-376 Cook Chicago Cbeyond Communications, Llc - IL Landline
312-377 Cook Chicago Xo Illinois, Inc. Landline
312-378 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-379 Cook Chicago Ovation Communications Of Illinois, Inc. Landline
312-380 Cook Chicago Ameritech Illinois Landline
312-381 Cook Chicago Ameritech Illinois Landline
312-382 Cook Chicago Ameritech Illinois Landline
312-384 Cook Chicago Ameritech Illinois Landline
312-385 Cook Chicago Ameritech Illinois Landline
312-386 Cook Chicago Ameritech Illinois Landline
312-387 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-388 Cook Chicago Sprint Spectrum L.p. Wireless
312-389 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-390 Cook Chicago American Messaging Services, Llc Wireless
312-391 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-393 Cook Chicago American Messaging Services, Llc Wireless
312-394 Cook Chicago Ameritech Illinois Landline
312-395 Cook Chicago At&t Local Landline
312-396 Cook Chicago Ameritech Illinois Landline
312-397 Cook Chicago Ameritech Illinois Landline
312-398 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-399 Cook Chicago Sprint Spectrum L.p. Wireless
312-400 Cook Chicago American Messaging Services, Llc Wireless
312-401 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-402 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-403 Cook La Grange Park Cellco Partnership Dba Verizon Wireless - IL Wireless
312-404 Cook Chicago T-Mobile Usa, Inc. Wireless
312-405 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-406 Cook Wheeling New Cingular Wireless Pcs, Llc - IL Wireless
312-407 Cook Chicago Ameritech Illinois Landline
312-408 Cook Chicago Ameritech Illinois Landline
312-409 Cook Chicago Ameritech Illinois Landline
312-410 Cook Chicago Ameritech Illinois Landline
312-412 Cook Wheeling New Cingular Wireless Pcs, Llc - IL Wireless
312-413 Cook Chicago Ameritech Illinois Landline
312-415 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-416 Cook Chicago Mci Worldcom Communications, Inc. - IL Landline
312-417 Cook Chicago Ameritech Illinois Wireless
312-418 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-419 Cook Chicago Ameritech Illinois Landline
312-420 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-421 Cook Chicago Ameritech Illinois Landline
312-422 Cook Chicago Ameritech Illinois Landline
312-423 Cook Chicago Broadwing Communications, Llc - IL Landline
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Phone Numbers Starting With (312) Area Code

Phone Number
312-818-5250		 USAGE
Landline		 City
Chicago		 Operate
Read more about who called from 3128185250		 Update Time
Mar-26-2026
Phone Number
312-380-4033		 USAGE
Landline		 City
Chicago		 Operate
Read more about who called from 3123804033		 Update Time
Mar-26-2026
Phone Number
312-893-4813		 USAGE
Landline		 City
Chicago		 Operate
Read more about who called from 3128934813		 Update Time
Mar-26-2026
Phone Number
312-459-4089		 USAGE
Wireless		 City
Chicago		 Operate
Read more about who called from 3124594089		 Update Time
Mar-26-2026
Phone Number
312-399-2709		 USAGE
Wireless		 City
Chicago		 Operate
Read more about who called from 3123992709		 Update Time
Mar-26-2026
Phone Number
312-421-6700		 USAGE
Landline		 City
Chicago		 Operate
Read more about who called from 3124216700		 Update Time
Mar-26-2026
Phone Number
312-971-6408		 USAGE
Landline		 City
Chicago		 Operate
Read more about who called from 3129716408		 Update Time
Mar-26-2026
Phone Number
312-248-7479		 USAGE
Landline		 City
Chicago		 Operate
Read more about who called from 3122487479		 Update Time
Mar-26-2026
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