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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
312-745 Cook Chicago Ameritech Illinois Landline
312-746 Cook Chicago Ameritech Illinois Landline
312-747 Cook Chicago Ameritech Illinois Landline
312-748 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-749 DuPage Hinsdale New Cingular Wireless Pcs, Llc - IL Wireless
312-750 Cook Chicago Ameritech Illinois Landline
312-751 Cook Chicago Ameritech Illinois Landline
312-752 Cook Chicago Broadwing Communications, Llc - IL Landline
312-753 Cook Chicago Rcn Telecom Services Of Illinois, Inc. - IL Landline
312-754 Cook Chicago Level 3 Telecom Of Illinois, Llc - IL Landline
312-755 Cook Chicago Ameritech Illinois Landline
312-756 Cook Chicago Ameritech Illinois Landline
312-757 Cook Chicago Getgo Communications Llc - IL Landline
312-758 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-759 Cook Chicago Ameritech Illinois Landline
312-760 Cook Chicago American Messaging Services, Llc Wireless
312-762 Cook Chicago Ameritech Illinois Landline
312-765 Cook Chicago Ameritech Illinois Landline
312-768 Cook Chicago At&t Local Landline
312-769 Cook Chicago Indiana Paging Ntwk Wireless
312-770 Cook Chicago Ameritech Illinois Landline
312-771 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-772 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-775 Cook Chicago Ameritech Illinois Landline
312-777 Cook Chicago Teleport Communications America, Llc - IL Landline
312-780 Cook Chicago Mci Worldcom Communications, Inc. - IL Landline
312-781 Cook Chicago Ameritech Illinois Landline
312-782 Cook Chicago Ameritech Illinois Landline
312-784 Cook Chicago First Communications Llc - IL Landline
312-786 Cook Chicago Ameritech Illinois Landline
312-787 Cook Chicago Ameritech Illinois Landline
312-788 Cook Chicago Ameritech Illinois Landline
312-789 Cook Chicago Ameritech Illinois Landline
312-790 Cook Chicago Ameritech Illinois Wireless
312-791 Cook Chicago Ameritech Illinois Landline
312-793 Cook Chicago Ameritech Illinois Landline
312-794 Cook Chicago Rcn Telecom Services Of Illinois, Inc. - IL Landline
312-795 Cook Chicago Ameritech Illinois Landline
312-797 Cook Chicago Ameritech Illinois Landline
312-798 Cook Chicago Ameritech Illinois Landline
312-799 Cook Chicago Ameritech Illinois Landline
312-800 Cook Chicago Peerless Network Of Illinois, Llc - IL Landline
312-801 Cook Chicago 365 Wireless, Llc Wireless
312-802 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-803 Cook Chicago Mci Worldcom Communications, Inc. - IL Landline
312-804 Cook Chicago T-Mobile Usa, Inc. Wireless
312-805 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-806 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-807 Cook Chicago Ameritech Illinois Landline
312-808 Cook Chicago Ameritech Illinois Landline
312-810 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-812 Cook Chicago Ameritech Illinois Wireless
312-813 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-814 Cook Chicago Ameritech Illinois Landline
312-816 DuPage Hinsdale New Cingular Wireless Pcs, Llc - IL Wireless
312-817 Cook Chicago Ameritech Illinois Landline
312-819 Cook Chicago Ameritech Illinois Landline
312-820 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-821 Cook Chicago Mci Worldcom Communications, Inc. - IL Landline
312-822 Cook Chicago Ameritech Illinois Landline
312-823 Cook Chicago Ameritech Illinois Landline
312-827 Cook Chicago Ameritech Illinois Landline
312-828 Cook Chicago Ameritech Illinois Landline
312-829 Cook Chicago Ameritech Illinois Landline
312-830 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-831 Cook Chicago Ameritech Illinois Landline
312-832 Cook Chicago Ameritech Illinois Landline
312-833 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-834 Cook Chicago Ameritech Illinois Landline
312-835 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
« 1 ...6 7 8 9 10 »

Phone Numbers Starting With (312) Area Code

Phone Number
312-982-4088		 USAGE
Wireless		 City
Chicago		 Operate
Read more about who called from 3129824088		 Update Time
Mar-31-2025
Phone Number
312-714-6765		 USAGE
Landline		 City
Chicago		 Operate
Read more about who called from 3127146765		 Update Time
Mar-31-2025
Phone Number
312-500-4541		 USAGE
Landline		 City
Chicago		 Operate
Read more about who called from 3125004541		 Update Time
Mar-31-2025
Phone Number
312-487-3799		 USAGE
Landline		 City
Chicago		 Operate
Read more about who called from 3124873799		 Update Time
Mar-31-2025
Phone Number
312-953-2995		 USAGE
Wireless		 City
Chicago		 Operate
Read more about who called from 3129532995		 Update Time
Mar-31-2025
Phone Number
312-505-6175		 USAGE
Wireless		 City
Chicago		 Operate
Read more about who called from 3125056175		 Update Time
Mar-31-2025
Phone Number
312-680-8815		 USAGE
Wireless		 City
Chicago		 Operate
Read more about who called from 3126808815		 Update Time
Mar-31-2025
Phone Number
312-494-0273		 USAGE
Landline		 City
Chicago		 Operate
Read more about who called from 3124940273		 Update Time
Mar-31-2025
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