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Area Code 312 Prefixes

Prefixes
312-201-XXXX
City
Chicago
County
Cook
Phone Type
Landline Numbers
Prefixes
312-202-XXXX
City
Chicago
County
Cook
Phone Type
Landline Numbers
Prefixes
312-203-XXXX
City
Chicago
County
Cook
Phone Type
Wireless Numbers
Prefixes
312-204-XXXX
City
Chicago
County
Cook
Phone Type
Landline Numbers
Prefixes
312-205-XXXX
City
Chicago
County
Cook
Phone Type
Landline Numbers
Prefixes
312-206-XXXX
City
Chicago
County
Cook
Phone Type
Wireless Numbers
Prefixes
312-207-XXXX
City
Chicago
County
Cook
Phone Type
Landline Numbers
Prefixes
312-208-XXXX
City
Chicago
County
Cook
Phone Type
Wireless Numbers
Prefixes
312-209-XXXX
City
Northbrook
County
Adams
Phone Type
Wireless Numbers
Prefixes
312-212-XXXX
City
Chicago
County
Cook
Phone Type
Landline Numbers
Prefixes
312-213-XXXX
City
Chicago
County
Cook
Phone Type
Wireless Numbers
Prefixes
312-214-XXXX
City
Chicago
County
Cook
Phone Type
Landline Numbers
Prefixes
312-215-XXXX
City
Wheeling
County
Cook
Phone Type
Wireless Numbers
Prefixes
312-216-XXXX
City
Chicago
County
Cook
Phone Type
Landline Numbers
Prefixes
312-217-XXXX
City
Chicago
County
Cook
Phone Type
Wireless Numbers
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Area Code 312 Information

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.

There are other places with the same area code 312:

Chicago, IL

$157K
Average property valuation
The average home value is $157K.
59 y/o
Average Age
The average resident's age is 59 y/o.
$89.3K
Residents' average wealth
Income average is $89.3K.        
12,801,539
Illinois - IL Population
Population in Area Code 312: 12,801,539.
Illinois - IL
Latitude: 36° 58′ N to 42° 30′ N Longitude: 87° 30′ W to 91° 31′ W
Central 06:52:52
Time zone
Time zone in Area Code 312: Central 06:52:52.