Area Code 312 Details

State : Illinois
Major City : Chicago
Timezone : Central

312 is the North American telephone area code for the state of Illinois, including the cities of and Chicago.

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Prefix Primary City Company County Usage
312-201-#### Chicago, IL Ameritech Illinois Cook Landline
312-202-#### Chicago, IL Ameritech Illinois Cook Landline
312-203-#### Chicago, IL New Cingular Wireless PCS Cook Cell Number
312-204-#### Chicago, IL Ameritech Illinois Cook Landline
312-205-#### Chicago, IL Allegiance Telecom Cook Landline
312-206-#### Chicago, IL New Cingular Wireless PCS Cook Cell Number
312-207-#### Chicago, IL Ameritech Illinois Cook Landline
312-208-#### Chicago, IL New Cingular Wireless PCS Cook Cell Number
312-209-#### Northbrook, IL Cellco Partnership DBA Verizon Wireless Cook Cell Number
312-210-#### Chicago, IL Cook Landline
312-212-#### Chicago, IL Ameritech Illinois Cook Landline
312-213-#### Chicago, IL New Cingular Wireless PCS Cook Cell Number
312-214-#### Chicago, IL Ameritech Illinois Cook Landline
312-215-#### Wheeling, IL New Cingular Wireless PCS Cook Cell Number
312-216-#### Cook Cell Number
312-217-#### Chicago, IL United States Cellular Corp. - Illinois Cook Cell Number
312-218-#### Chicago, IL New Cingular Wireless PCS Cook Cell Number
312-220-#### Chicago, IL Ameritech Illinois Cook Landline
312-221-#### Sprint Spectrum L.p. Cook Cell Number
312-222-#### Chicago, IL Ameritech Illinois Cook Landline
312-223-#### Chicago, IL Ameritech Illinois Cook Landline
312-224-#### Chicago, IL Broadwing Communications Cook Landline
312-225-#### Chicago, IL Ameritech Illinois Cook Landline
312-226-#### Chicago, IL Ameritech Illinois Cook Landline
312-227-#### Chicago, IL Ameritech Illinois Unknown
312-228-#### Chicago, IL Ameritech Illinois Cook Landline
312-229-#### Chicago, IL Ameritech Illinois Cook Landline
312-230-#### Chicago, IL Ameritech Illinois Cook Landline
312-231-#### Roselle, IL New Cingular Wireless PCS Du Page Cell Number
312-232-#### Chicago, IL American Messaging (am) Cook Cell Number
312-233-#### Chicago, IL Ameritech Illinois Cook Landline
312-234-#### Chicago, IL Ameritech Illinois Cook Landline
312-235-#### Chicago, IL Ameritech Illinois Cook Landline
312-236-#### Chicago, IL Ameritech Illinois Cook Landline
312-237-#### Chicago, IL Cellco Partnership DBA Verizon Wireless Cook Cell Number
312-238-#### Chicago, IL Broadwing Communications Cook Landline
312-239-#### Chicago, IL AT&T Local Cook Landline
312-240-#### Chicago, IL Ameritech Illinois Cook Landline
312-241-#### Cook Cell Number
312-242-#### Chicago, IL Teleport Communications Group - Chicago Cook Landline
312-243-#### Chicago, IL Ameritech Illinois Cook Landline
312-244-#### Chicago, IL Ameritech Illinois Cook Landline
312-245-#### Chicago, IL Ameritech Illinois Cook Landline
312-246-#### Wheeling, IL New Cingular Wireless PCS Cook Cell Number
312-247-#### Chicago, IL Globalcom-il Cook Landline
312-249-#### Chicago, IL Usa Mobility Wireless Cook Cell Number
312-250-#### Chicago, IL Usa Mobility Wireless Cook Cell Number
312-251-#### Chicago, IL Ameritech Illinois Cook Landline
312-252-#### Chicago, IL Allegiance Telecom Cook Landline
312-253-#### Chicago, IL Allegiance Telecom Cook Landline
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