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Area Code 312

 

Illinois area code 312 has been in service since 1947. It has 486 landlines and 147 wireless prefixes (exchanges) serviced by 41 carriers. It covers 3 counties, 528 ZIP codes, and 1 city, including Chicago.

State:
Illinois
Time Zone:
Central (12:13 pm)

Area Code (312) has 634 prefixes

Prefix County City Company/Carrier Line Type
(312) 201- Cook Chicago Ameritech Illinois Landline
(312) 202- Cook Chicago Ameritech Illinois Landline
(312) 203- Cook Chicago New Cingular Wireless Pcs,... Cell Phone
(312) 204- Cook Chicago Ameritech Illinois Landline
(312) 205- Cook Chicago Allegiance Telecom, Inc. - Il Landline
(312) 206- Cook Chicago New Cingular Wireless Pcs,... Cell Phone
(312) 207- Cook Chicago Ameritech Illinois Landline
(312) 208- Cook Chicago New Cingular Wireless Pcs,... Cell Phone
(312) 209- Cook Chicago Cellco Partnership Dba Veri... Cell Phone
(312) 211- Cook Chicago Unknown
(312) 212- Cook Chicago Ameritech Illinois Landline
(312) 213- Cook Chicago New Cingular Wireless Pcs,... Cell Phone
(312) 214- Cook Chicago Ameritech Illinois Landline
(312) 216- Cook Chicago Unknown Landline
(312) 217- Cook Chicago United States Cellular Corp... Landline
(312) 218- Cook Chicago New Cingular Wireless Pcs,... Cell Phone
(312) 220- Cook Chicago Ameritech Illinois Landline
(312) 221- Cook Chicago Sprint Spectrum L.p. Cell Phone
(312) 222- Cook Chicago Ameritech Illinois Landline
(312) 223- Cook Chicago Ameritech Illinois Landline
(312) 224- Cook Chicago Broadwing Communications, L... Landline
(312) 225- Cook Chicago Ameritech Illinois Landline
(312) 226- Cook Chicago Ameritech Illinois Landline
(312) 227- Cook Chicago Ameritech Illinois Landline
(312) 228- Cook Chicago Ameritech Illinois Landline
(312) 229- Cook Chicago Ameritech Illinois Landline
(312) 230- Cook Chicago Ameritech Illinois Landline
(312) 231- Will Aurora New Cingular Wireless Pcs,... Cell Phone
(312) 232- Cook Berwyn American Messaging (am), Inc. Landline
(312) 233- Cook Chicago Ameritech Illinois Landline
(312) 234- Cook Chicago Ameritech Illinois Landline
(312) 235- Cook Chicago Ameritech Illinois Landline
(312) 236- Cook Chicago Ameritech Illinois Landline
(312) 237- Cook Chicago Cellco Partnership Dba Veri... Cell Phone
(312) 238- Cook Chicago Broadwing Communications, L... Landline
(312) 239- Cook Chicago At&t Local Landline
(312) 240- Cook Chicago Ameritech Illinois Landline
(312) 242- Cook Chicago Teleport Communications Gro... Landline
(312) 243- Cook Chicago Ameritech Illinois Landline
(312) 244- Cook Chicago Ameritech Illinois Landline
(312) 245- Cook Chicago Ameritech Illinois Landline
(312) 246- Cook Chicago New Cingular Wireless Pcs,... Cell Phone
(312) 247- Cook Chicago Globalcom, Inc.-il Landline
(312) 248- Cook Chicago Unknown Landline
(312) 250- Cook Chicago Usa Mobility Wireless, Inc. Cell Phone
(312) 251- Cook Chicago Ameritech Illinois Landline
(312) 252- Cook Chicago Allegiance Telecom, Inc. - Il Landline
(312) 253- Cook Chicago Allegiance Telecom, Inc. - Il Landline
(312) 254- Cook Chicago Allegiance Telecom, Inc. - Il Landline
(312) 255- Cook Chicago Ameritech Illinois Landline
(312) 256- Cook Chicago Allegiance Telecom, Inc. - Il Landline
(312) 258- Cook Chicago Ameritech Illinois Landline
(312) 259- Cook Chicago New Cingular Wireless Pcs,... Cell Phone
(312) 260- Cook Chicago Mcimetro Access Transmissio... Landline
(312) 261- Cook Chicago Broadwing Communications, L... Landline
(312) 262- Cook Chicago Allegiance Telecom, Inc. - Il Landline
(312) 263- Cook Chicago Ameritech Illinois Landline
(312) 264- Cook Chicago Broadwing Communications, L... Landline
(312) 265- Cook Chicago Access One, Inc. - Il Landline
(312) 266- Cook Chicago Ameritech Illinois Landline
(312) 267- Cook Chicago Ameritech Illinois Landline
(312) 268- Cook Chicago Broadwing Communications, L... Landline
(312) 269- Cook Chicago Ameritech Illinois Landline
(312) 271- Cook Chicago Usa Mobility Wireless, Inc. Cell Phone
(312) 272- Cook Northbrook Usa Mobility Wireless, Inc. Cell Phone
(312) 274- Cook Chicago Ameritech Illinois Landline
(312) 275- Cook Chicago Allegiance Telecom, Inc. - Il Landline
(312) 276- Cook Chicago Allegiance Telecom, Inc. - Il Landline
(312) 277- Cook Chicago Allegiance Telecom, Inc. - Il Landline
(312) 278- Cook Chicago Broadwing Communications, L... Landline
(312) 279- Cook Chicago Mcimetro Access Transmissio... Landline
(312) 280- Cook Chicago Ameritech Illinois Landline
(312) 281- Cook Chicago Global Crossing Local Servi... Landline
(312) 282- Cook Chicago New Cingular Wireless Pcs,... Cell Phone
(312) 283- Cook Chicago Global Crossing Local Servi... Landline
(312) 284- Cook Chicago Xo Illinois, Inc. Landline
(312) 285- Cook Chicago Sprint Spectrum L.p. Cell Phone
(312) 286- Cook Chicago New Cingular Wireless Pcs,... Cell Phone
(312) 287- Cook Chicago Nextel Communications, Inc. Cell Phone
(312) 288- Cook Chicago Mcimetro Access Transmissio... Landline
(312) 290- Cook Chicago Usa Mobility Wireless, Inc. Cell Phone
(312) 291- Cook Chicago Ameritech Illinois Landline
(312) 293- Cook Chicago Ameritech Illinois Landline
(312) 294- Cook Chicago Ameritech Illinois Landline
(312) 296- Cook Chicago Nextel Communications, Inc. Cell Phone
(312) 297- Cook Chicago Ameritech Illinois Landline
(312) 298- Cook Chicago Sigecom, Llc - Il Landline
(312) 299- Cook Des Plaines Usa Mobility Wireless, Inc. Cell Phone
(312) 300- Cook Chicago Net Talk.com, Inc. - Il Landline
(312) 301- Cook Chicago New Cingular Wireless Pcs,... Cell Phone
(312) 302- Cook Chicago Ameritech Illinois Landline
(312) 303- Cook Chicago New Cingular Wireless Pcs,... Cell Phone
(312) 304- Kane Saint Charles New Cingular Wireless Pcs,... Cell Phone
(312) 305- Cook Chicago Cellco Partnership Dba Veri... Cell Phone
(312) 306- Cook Chicago Ameritech Illinois Landline
(312) 307- Cook Chicago New Cingular Wireless Pcs,... Cell Phone
(312) 308- Cook Schaumburg Ameritech Illinois Landline
(312) 310- Cook Chicago Cellco Partnership Dba Veri... Cell Phone
(312) 312- Cook Chicago Unknown Landline
(312) 314- Cook Chicago New Cingular Wireless Pcs,... Cell Phone