312 Area Code has 683 prefixes

PrefixPrimary CityCarrier
312-201ChicagoAmeritech Illinois
312-202ChicagoAmeritech Illinois
312-203WillowbrookNew Cingular Wireless Pcs, Llc - Il
312-204ChicagoAmeritech Illinois
312-205ChicagoAllegiance Telecom, Inc. - Il
312-206WillowbrookNew Cingular Wireless Pcs, Llc - Il
312-207ChicagoAmeritech Illinois
312-208WillowbrookNew Cingular Wireless Pcs, Llc - Il
312-209ElginCellco Partnership Dba Verizon Wireless - Il
312-212ChicagoAmeritech Illinois
312-213WillowbrookNew Cingular Wireless Pcs, Llc - Il
312-214ChicagoAmeritech Illinois
312-215SchaumburgNew Cingular Wireless Pcs, Llc - Il
312-216ChicagoFirst Communications Llc - Il
312-217Arlington HeightsSprint Spectrum L.p.
312-218WillowbrookNew Cingular Wireless Pcs, Llc - Il
312-219ChicagoBandwidth.com Clec, Llc - Il
312-220ChicagoAmeritech Illinois
312-221Arlington HeightsSprint Spectrum L.p.
312-222ChicagoAmeritech Illinois
312-223ChicagoAmeritech Illinois
312-224Arlington HeightsBroadwing Communications, Llc - Il
312-225ChicagoAmeritech Illinois
312-226ChicagoAmeritech Illinois
312-227ChicagoAmeritech Illinois
312-228ChicagoAmeritech Illinois
312-229ChicagoAmeritech Illinois
312-230ChicagoAmeritech Illinois
312-231SchaumburgNew Cingular Wireless Pcs, Llc - Il
312-232ChicagoAmerican Messaging Services, Llc
312-233ChicagoAmeritech Illinois
312-234ChicagoAmeritech Illinois
312-235ChicagoAmeritech Illinois
312-236ChicagoAmeritech Illinois
312-237ElginCellco Partnership Dba Verizon Wireless - Il
312-238Arlington HeightsBroadwing Communications, Llc - Il
312-239ChicagoAt&t Local
312-240ChicagoAmeritech Illinois
312-241WillowbrookNew Cingular Wireless Pcs, Llc - Il
312-242ChicagoTeleport Communications America, Llc - Il
312-243ChicagoAmeritech Illinois
312-244ChicagoAmeritech Illinois
312-245ChicagoAmeritech Illinois
312-246SchaumburgNew Cingular Wireless Pcs, Llc - Il
312-247ChicagoFirst Communications Llc - Il
312-248ChicagoMetro Pcs, Inc.
312-249NapervilleUsa Mobility Wireless, Inc.
312-250NapervilleUsa Mobility Wireless, Inc.
312-251ChicagoAmeritech Illinois
312-252ChicagoAllegiance Telecom, Inc. - Il
312-253ChicagoAllegiance Telecom, Inc. - Il
312-254ChicagoAllegiance Telecom, Inc. - Il
312-255ChicagoAmeritech Illinois
312-256ChicagoAllegiance Telecom, Inc. - Il
312-257ElginCellco Partnership Dba Verizon Wireless - Il
312-258ChicagoAmeritech Illinois
312-259WillowbrookNew Cingular Wireless Pcs, Llc - Il
312-260BensenvilleMcimetro Access Transmission Services Llc
312-261Arlington HeightsBroadwing Communications, Llc - Il
312-262ChicagoAllegiance Telecom, Inc. - Il
312-263ChicagoAmeritech Illinois
312-264Arlington HeightsBroadwing Communications, Llc - Il
312-265Arlington HeightsAccess One, Inc. - Il
312-266ChicagoAmeritech Illinois
312-267ChicagoAmeritech Illinois
312-268Arlington HeightsBroadwing Communications, Llc - Il
312-269ChicagoAmeritech Illinois
312-271NapervilleUsa Mobility Wireless, Inc.
312-272NapervilleUsa Mobility Wireless, Inc.
312-273ElginCellco Partnership Dba Verizon Wireless - Il
312-274ChicagoAmeritech Illinois
312-275ChicagoAllegiance Telecom, Inc. - Il
312-276ChicagoAllegiance Telecom, Inc. - Il
312-277ChicagoAllegiance Telecom, Inc. - Il
312-278Arlington HeightsBroadwing Communications, Llc - Il
312-279BensenvilleMcimetro Access Transmission Services Llc
312-280ChicagoAmeritech Illinois
312-281ChicagoGlobal Crossing Local Services, Inc.-il
312-282WillowbrookNew Cingular Wireless Pcs, Llc - Il
312-283ChicagoGlobal Crossing Local Services, Inc.-il
312-284ChicagoXo Illinois, Inc.
312-285Arlington HeightsSprint Spectrum L.p.
312-286WillowbrookNew Cingular Wireless Pcs, Llc - Il
312-287Arlington HeightsSprint Spectrum L.p.
312-288BensenvilleMcimetro Access Transmission Services Llc
312-289NapervilleUsa Mobility Wireless, Inc.
312-290NapervilleUsa Mobility Wireless, Inc.
312-291ChicagoAmeritech Illinois
312-292ChicagoBandwidth.com Clec, Llc - Il
312-293ChicagoAmeritech Illinois
312-294ChicagoAmeritech Illinois
312-295NapervilleUsa Mobility Wireless, Inc.
312-296Arlington HeightsSprint Spectrum L.p.
312-297ChicagoAmeritech Illinois
312-298ChicagoSigecom, Llc Dba Wow Internet Cable And Phone
312-299NapervilleUsa Mobility Wireless, Inc.
312-300ChicagoNet Talk.com, Inc. - Il
312-301WillowbrookNew Cingular Wireless Pcs, Llc - Il
312-302ChicagoAmeritech Illinois
312-303SchaumburgNew Cingular Wireless Pcs, Llc - Il