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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
312-275 Cook Chicago Allegiance Telecom, Inc. - IL Landline
312-276 Cook Chicago Allegiance Telecom, Inc. - IL Landline
312-277 Cook Chicago Allegiance Telecom, Inc. - IL Landline
312-278 Cook Chicago Broadwing Communications, Llc - IL Landline
312-279 Cook Chicago Mcimetro Access Transmission Services Llc Landline
312-280 Cook Chicago Ameritech Illinois Landline
312-281 Cook Chicago Global Crossing Local Services, Inc.-Il Landline
312-282 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-283 Cook Chicago Global Crossing Local Services, Inc.-Il Landline
312-284 Cook Chicago Xo Illinois, Inc. Landline
312-285 Cook Chicago Sprint Spectrum L.p. Wireless
312-286 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-287 Cook Chicago Sprint Spectrum L.p. Wireless
312-288 Cook Chicago Mcimetro Access Transmission Services Llc Landline
312-289 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-290 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-291 Cook Chicago Ameritech Illinois Landline
312-292 Cook Chicago Bandwidth.com Clec, Llc - IL Wireless
312-293 Cook Chicago Ameritech Illinois Landline
312-294 Cook Chicago Ameritech Illinois Landline
312-295 Cook La Grange Park Usa Mobility Wireless, Inc. Wireless
312-296 Cook Chicago Sprint Spectrum L.p. Wireless
312-297 Cook Chicago Ameritech Illinois Landline
312-298 Cook Chicago Sigecom, Llc Dba Wow Internet Cable And Phone Landline
312-299 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-300 Cook Chicago Net Talk.com, Inc. - IL Landline
312-301 DuPage Hinsdale New Cingular Wireless Pcs, Llc - IL Wireless
312-302 Cook Chicago Ameritech Illinois Landline
312-303 Cook Wheeling New Cingular Wireless Pcs, Llc - IL Wireless
312-304 DuPage Hinsdale New Cingular Wireless Pcs, Llc - IL Wireless
312-305 Adams Northbrook Cellco Partnership Dba Verizon Wireless - IL Wireless
312-306 Cook Chicago Ameritech Illinois Landline
312-307 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-308 Cook Chicago Ameritech Illinois Landline
312-309 Cook Chicago Ameritech Illinois Landline
312-310 Adams Northbrook Cellco Partnership Dba Verizon Wireless - IL Wireless
312-314 DuPage Hinsdale New Cingular Wireless Pcs, Llc - IL Wireless
312-315 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-316 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-317 Cook Wheeling New Cingular Wireless Pcs, Llc - IL Wireless
312-318 Cook La Grange Park Cellco Partnership Dba Verizon Wireless - IL Wireless
312-320 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-321 Cook Chicago Ameritech Illinois Landline
312-322 Cook Chicago Ameritech Illinois Landline
312-323 Cook Chicago American Messaging Services, Llc Wireless
312-324 Cook Chicago Level 3 Communications, Llc - IL Landline
312-325 Cook Chicago Ameritech Illinois Landline
312-326 Cook Chicago Ameritech Illinois Landline
312-327 Cook Chicago Xo Illinois, Inc. Landline
312-328 Cook Chicago Ameritech Illinois Landline
312-329 Cook Chicago Ameritech Illinois Landline
312-330 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-331 Cook Wheeling New Cingular Wireless Pcs, Llc - IL Wireless
312-332 Cook Chicago Ameritech Illinois Landline
312-333 Cook Chicago American Messaging Services, Llc Wireless
312-334 Cook Chicago First Communications Llc - IL Landline
312-335 Cook Chicago Ameritech Illinois Landline
312-336 Cook Chicago Ameritech Illinois Landline
312-337 Cook Chicago Ameritech Illinois Landline
312-338 Cook Chicago Ameritech Illinois Landline
312-339 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-340 Cook Chicago T-Mobile Usa, Inc. Wireless
312-341 Cook Chicago Ameritech Illinois Landline
312-342 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-343 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-344 Cook Chicago Ameritech Illinois Landline
312-345 Cook Chicago Ameritech Illinois Landline
312-346 Cook Chicago Ameritech Illinois Landline
312-347 Cook Chicago Ameritech Illinois Landline
312-348 Cook Chicago Neutral Tandem-Illinois, 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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