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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
312-502 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-503 Cook Chicago Broadwing Communications, Llc - IL Landline
312-504 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-505 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-506 Cook Chicago First Communications, Llc Landline
312-507 Cook Chicago Ameritech Illinois Landline
312-508 Cook Chicago Peerless Network Of Illinois, Llc - IL Landline
312-509 Cook Chicago Peerless Network Of Illinois, Llc - IL Landline
312-510 DuPage Hinsdale New Cingular Wireless Pcs, Llc - IL Wireless
312-512 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-513 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-514 Cook Chicago American Messaging Services, Llc Wireless
312-515 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-516 Cook Chicago Ameritech Illinois Landline
312-518 Cook Wheeling New Cingular Wireless Pcs, Llc - IL Wireless
312-519 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-520 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-521 Cook Chicago At&t Local Landline
312-523 Cook Chicago Sprint Spectrum L.p. Wireless
312-524 Cook Wheeling New Cingular Wireless Pcs, Llc - IL Wireless
312-525 Cook Chicago Mcimetro Access Transmission Services Llc Landline
312-526 Cook Chicago Ameritech Illinois Landline
312-527 Cook Chicago Ameritech Illinois Landline
312-528 Cook Chicago Ameritech Illinois Landline
312-529 Cook Chicago At&t Local Landline
312-530 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-531 DuPage Hinsdale New Cingular Wireless Pcs, Llc - IL Wireless
312-532 Cook Chicago T-Mobile Usa, Inc. Wireless
312-533 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-534 Cook Chicago Ameritech Illinois Landline
312-537 Cook Chicago Ameritech Illinois Landline
312-540 Cook Chicago Ameritech Illinois Landline
312-541 Cook Chicago Ameritech Illinois Landline
312-542 Cook Chicago Ameritech Illinois Landline
312-543 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-544 Cook Chicago Ameritech Illinois Landline
312-545 Cook Chicago Sprint Spectrum L.p. Wireless
312-546 Cook Chicago Level 3 Communications, Llc - IL Landline
312-547 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-548 Cook Chicago Broadwing Communications, Llc - IL Landline
312-550 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-551 Cook Chicago Ameritech Illinois Landline
312-552 Cook Chicago Ameritech Illinois Landline
312-553 Cook Chicago Ameritech Illinois Landline
312-554 Cook Chicago Ameritech Illinois Landline
312-556 Cook Chicago Ameritech Illinois Wireless
312-557 Cook Chicago Ameritech Illinois Landline
312-558 Cook Chicago Ameritech Illinois Landline
312-559 Cook Chicago Ameritech Illinois Landline
312-560 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-561 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-562 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-563 Cook Chicago Ameritech Illinois Landline
312-564 Cook Chicago First Communications, Llc Landline
312-565 Cook Chicago Ameritech Illinois Landline
312-566 Cook Chicago Ameritech Illinois Landline
312-567 Cook Chicago Ameritech Illinois Landline
312-568 Cook Chicago Ameritech Illinois Landline
312-569 Cook Chicago Ameritech Illinois Landline
312-570 Cook Chicago Ameritech Illinois Landline
312-571 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-572 Cook Chicago Ameritech Illinois Landline
312-573 Cook Chicago Ameritech Illinois Landline
312-574 Cook Chicago Ameritech Illinois Landline
312-575 Cook Chicago Ameritech Illinois Landline
312-576 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-577 Cook Chicago Mci Worldcom Communications, Inc. - IL Landline
312-578 Cook Chicago Ameritech Illinois Landline
312-580 Cook Chicago Ameritech Illinois Landline
312-582 Cook Chicago Ameritech Illinois 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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