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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
312-583 Cook Chicago Ameritech Illinois Landline
312-585 Cook Chicago Mcimetro Access Transmission Services Llc Landline
312-587 Cook Chicago Ameritech Illinois Landline
312-588 Cook Chicago Ameritech Illinois Landline
312-589 Cook Chicago Ameritech Illinois Landline
312-590 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-591 Cook Chicago Ameritech Illinois Landline
312-592 Cook Chicago Ameritech Illinois Landline
312-593 Cook Chicago T-Mobile Usa, Inc. Wireless
312-594 Cook Chicago Mcimetro Access Transmission Services Llc Landline
312-595 Cook Chicago Ameritech Illinois Landline
312-596 Cook Chicago Teleport Communications America, Llc - IL Landline
312-600 Cook Chicago Neutral Tandem-Illinois, Llc - IL Landline
312-601 Cook Chicago Mcimetro Access Transmission Services Llc Landline
312-602 Cook Chicago Broadwing Communications, Llc - IL Landline
312-603 Cook Chicago Ameritech Illinois Landline
312-604 Cook Chicago Xo Illinois, Inc. Landline
312-605 Cook Chicago Ovation Communications Of Illinois, Inc. Landline
312-606 Cook Chicago Ameritech Illinois Landline
312-607 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-608 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-609 Cook Chicago Ameritech Illinois Landline
312-610 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-612 Cook Chicago Ameritech Illinois Landline
312-613 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-614 Cook Chicago Ameritech Illinois Landline
312-615 Cook Wheeling New Cingular Wireless Pcs, Llc - IL Wireless
312-616 Cook Chicago Ameritech Illinois Landline
312-617 Cook Chicago Sprint Spectrum L.p. Wireless
312-618 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-619 Cook Chicago T-Mobile Usa, Inc. Wireless
312-620 Cook Chicago Bandwidth.com Clec, Llc - IL Landline
312-621 Cook Chicago Ameritech Illinois Landline
312-622 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-623 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-624 Cook Chicago Rcn Telecom Services Of Illinois, Inc. - IL Landline
312-625 Cook Chicago Level 3 Communications, Llc - IL Landline
312-626 Cook Chicago Neutral Tandem-Illinois, Llc Landline
312-627 Cook Chicago Ameritech Illinois Landline
312-628 Cook Chicago Xo Illinois, Inc. Landline
312-629 Cook Chicago Ameritech Illinois Landline
312-630 Cook Chicago Ameritech Illinois Landline
312-631 Cook Chicago Centurylink Communications Llc Landline
312-632 Cook Chicago Ameritech Illinois Landline
312-633 Cook Chicago Ameritech Illinois Landline
312-634 Cook Chicago Ameritech Illinois Landline
312-635 Cook Chicago Global Crossing Local Services, Inc.-Il Landline
312-636 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-637 Cook Chicago Broadwing Communications, Llc - IL Landline
312-638 Cook Chicago Broadwing Communications, Llc - IL Landline
312-639 Not available. Not available. Cellco Partnership Dba Verizon Wireless - IL Wireless
312-640 Cook Chicago Ameritech Illinois Landline
312-641 Cook Chicago Ameritech Illinois Landline
312-642 Cook Chicago Ameritech Illinois Landline
312-643 Cook Chicago Rcn Telecom Services Of Illinois, Inc. - IL Landline
312-644 Cook Chicago Ameritech Illinois Landline
312-645 Cook Chicago Ameritech Illinois Landline
312-646 Cook Chicago Broadwing Communications, Llc - IL Landline
312-647 Cook Chicago T-Mobile Usa, Inc. Wireless
312-648 Cook Chicago Ameritech Illinois Landline
312-649 Cook Chicago Ameritech Illinois Landline
312-650 Cook Chicago Rcn Telecom Services Of Illinois, Inc. - IL Landline
312-651 Cook Chicago Ameritech Illinois Landline
312-652 Cook Chicago Ameritech Illinois Landline
312-653 Cook Chicago Ameritech Illinois Landline
312-654 Cook Chicago Ameritech Illinois Landline
312-655 Cook Chicago Ameritech Illinois Landline
312-656 Cook Chicago Sprint Spectrum L.p. Wireless
312-657 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-658 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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