Active Prefixes in Area Code 312

Prefix Primary City Phone Type Company
312-961-#### Chicago Wireless Numbers New Cingular Wireles...
312-962-#### Chicago Landline Numbers Global Crossing Loca...
312-963-#### Chicago Wireless Numbers Usa Mobility Wireles...
312-965-#### Chicago Wireless Numbers Cellco Partnership D...
312-968-#### La Grange Park Wireless Numbers Cellco Partnership D...
312-969-#### La Grange Park Wireless Numbers Cellco Partnership D...
312-970-#### Chicago Landline Numbers Ameritech Illinois...
312-972-#### Chicago Wireless Numbers New Cingular Wireles...
312-974-#### Chicago Landline Numbers Ameritech Illinois...
312-977-#### Chicago Landline Numbers Ameritech Illinois...
312-979-#### Chicago Landline Numbers Ameritech Illinois...
312-980-#### Chicago Landline Numbers Teleport Communicati...
312-981-#### Chicago Landline Numbers Ovation Communicatio...
312-983-#### Chicago Landline Numbers Ameritech Illinois...
312-984-#### Chicago Landline Numbers Ameritech Illinois...
312-985-#### Chicago Landline Numbers Ovation Communicatio...
312-986-#### Chicago Landline Numbers Ameritech Illinois...
312-987-#### Chicago Landline Numbers Ameritech Illinois...
312-988-#### Chicago Landline Numbers Ameritech Illinois...
312-990-#### Hinsdale Wireless Numbers New Cingular Wireles...
312-991-#### Wheeling Wireless Numbers New Cingular Wireles...
312-992-#### Chicago Landline Numbers Ameritech Illinois...
312-993-#### Chicago Landline Numbers Ameritech Illinois...
312-994-#### Chicago Landline Numbers Ovation Communicatio...
312-996-#### Chicago Landline Numbers Ameritech Illinois...
312-997-#### Chicago Landline Numbers Ameritech Illinois...
312-999-#### Chicago Landline Numbers Cygnus Telecommunica...
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Area Code 312 Introduction

Area Code:312
Country:United States
State/Province:Illinois - IL
Major City:Chicago
Time Zone:Central
Average property$157K
Average age 59 y/o
Average assets $89.3K
Population density 57,914 sq mi (149,932 km2)
Population 12,801,539
latitude Longitude:
36° 58′ N to 42° 30′ N / 87° 30′ W to 91° 31′ W
About 312 :
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 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.
Major cities or places
Chicago, IL