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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
312-836 Cook Chicago Ameritech Illinois Landline
312-839 Cook Chicago American Messaging Services, Llc Wireless
312-840 Cook Chicago Ameritech Illinois Landline
312-841 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-842 Cook Chicago Ameritech Illinois Landline
312-844 DuPage Hinsdale New Cingular Wireless Pcs, Llc - IL Wireless
312-845 Cook Chicago Ameritech Illinois Landline
312-846 Cook Chicago Ameritech Illinois Landline
312-848 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-849 Cook Chicago Ameritech Illinois Landline
312-850 Cook Chicago Ameritech Illinois Landline
312-851 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-852 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-853 Cook Chicago Ameritech Illinois Landline
312-854 Cook Chicago Rcn Telecom Services Of Illinois, Inc. - IL Landline
312-855 Cook Chicago Ameritech Illinois Landline
312-856 Cook Chicago Ameritech Illinois Landline
312-857 Cook Chicago Ameritech Illinois Landline
312-859 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-860 Cook Chicago New Cingular Wireless Pcs, Llc - IL Wireless
312-861 Cook Chicago Ameritech Illinois Landline
312-862 Cook Chicago Ameritech Illinois Landline
312-863 Cook Chicago Ovation Communications Of Illinois, Inc. Landline
312-864 Cook Chicago Ameritech Illinois Landline
312-865 Cook Wheeling New Cingular Wireless Pcs, Llc - IL Wireless
312-867 Cook Chicago Ameritech Illinois Landline
312-869 Cook Chicago Ameritech Illinois Landline
312-870 Cook Chicago First Communications Llc - IL Landline
312-873 Cook Chicago Mci Worldcom Communications, Inc. - IL Landline
312-875 Cook Chicago Ameritech Illinois Landline
312-876 Cook Chicago Ameritech Illinois Landline
312-878 Cook Chicago Peerless Network Of Illinois, Llc - IL Landline
312-879 Cook Chicago Ameritech Illinois Landline
312-880 Cook Chicago Ameritech Illinois Landline
312-881 Cook Chicago Ovation Communications Of Illinois, Inc. Landline
312-882 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-884 Cook Chicago Ovation Communications Of Illinois, Inc. Landline
312-886 Cook Chicago Ameritech Illinois Landline
312-887 Cook Chicago Ameritech Illinois Landline
312-888 Cook Chicago New Cingular Wireless Pcs, Llc - IL Landline
312-890 Cook Chicago Sprint Spectrum L.p. Wireless
312-891 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-892 Cook Chicago Broadwing Communications, Llc - IL Landline
312-893 Cook Chicago Broadwing Communications, Llc - IL Landline
312-894 Cook Chicago Mcimetro Access Transmission Services Llc Landline
312-895 Cook Chicago Broadwing Communications, Llc - IL Landline
312-896 Cook Chicago Broadwing Communications, Llc - IL Landline
312-898 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-899 Cook Chicago Ameritech Illinois Landline
312-901 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-902 Cook Chicago Ameritech Illinois Landline
312-903 Cook Chicago American Messaging Services, Llc Wireless
312-904 Cook Chicago Ameritech Illinois Landline
312-905 Cook Chicago Ameritech Illinois Landline
312-906 Cook Chicago Ameritech Illinois Landline
312-907 Cook Chicago Sprint Spectrum L.p. Wireless
312-908 Cook Chicago Ameritech Illinois Landline
312-909 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-910 Cook Chicago Usa Mobility Wireless, Inc. Wireless
312-912 Cook Chicago Ameritech Illinois Landline
312-913 Cook Chicago Ameritech Illinois Landline
312-914 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-915 Cook Chicago Ameritech Illinois Landline
312-916 Cook Chicago American Messaging Services, Llc Wireless
312-917 Cook Chicago Ameritech Illinois Landline
312-919 Cook Chicago Cellco Partnership Dba Verizon Wireless - IL Wireless
312-920 Cook Chicago Ameritech Illinois Landline
312-921 Cook Chicago Ameritech Illinois Landline
312-922 Cook Chicago Ameritech Illinois Landline
312-923 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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