Coverage Map
Interactive
Showing coverage area for Area Code 312 in Illinois.
Top Cities
| City Name | Type |
|---|---|
| Chicago | Principal |
| Lake Stonewood | Principal |
| Fallsport | Principal |
| East Stoneside | Principal |
| Lake Valleyside | Principal |
| Waterburg | Principal |
| Havenland | Principal |
| Creekcity | Principal |
| New Creekpark | Principal |
| Hillburg | Principal |
| Fort Woodpark | Principal |
| Mount Rivermouth | Principal |
| Woodwood | Principal |
| Hillfield | Principal |
| Stoneside | Principal |
| Fallscity | Principal |
| Watermouth | Principal |
| Fieldmouth | Principal |
| Fallsside | Principal |
| Waterfield | Principal |
| Stonepark | Principal |
| Ridgeport | Principal |
| Valleyville | Principal |
| Old Fallsville | Principal |
| Havenside | Principal |
| Hillcity | Principal |
| Hillburg | Principal |
| Stoneton | Principal |
| West Valleymouth | Principal |
| Fieldside | Principal |
Counties Served
| County | State |
|---|---|
| Cook County | Illinois |
Active Phone Prefixes
Recently Assigned
| Prefix | Usage | Location | Carrier |
|---|---|---|---|
| 312-900 | Landline | Greater Metro Area | Sprint |
| 312-242 | Mobile | Greater Metro Area | AT&T |
| 312-763 | Mobile | Greater Metro Area | Sprint |
| 312-561 | Mobile | Greater Metro Area | Verizon Wireless |
| 312-688 | Landline | Greater Metro Area | AT&T |
| 312-561 | Mobile | Greater Metro Area | T-Mobile |
| 312-270 | Mobile | Greater Metro Area | AT&T |
| 312-577 | Mobile | Greater Metro Area | T-Mobile |
| 312-477 | Mobile | Greater Metro Area | Verizon Wireless |
| 312-530 | Mobile | Greater Metro Area | Verizon Wireless |
| 312-214 | Mobile | Greater Metro Area | T-Mobile |
| 312-344 | Landline | Greater Metro Area | T-Mobile |
| 312-903 | Mobile | Greater Metro Area | T-Mobile |
| 312-924 | Landline | Greater Metro Area | AT&T |
| 312-238 | Landline | Greater Metro Area | AT&T |
| 312-587 | Mobile | Greater Metro Area | Sprint |
| 312-359 | Mobile | Greater Metro Area | AT&T |
| 312-477 | Mobile | Greater Metro Area | T-Mobile |
| 312-945 | Mobile | Greater Metro Area | Sprint |
| 312-568 | Mobile | Greater Metro Area | Verizon Wireless |
| 312-558 | Landline | Greater Metro Area | Sprint |
| 312-324 | Mobile | Greater Metro Area | Sprint |
| 312-755 | Mobile | Greater Metro Area | Verizon Wireless |
| 312-356 | Landline | Greater Metro Area | AT&T |
| 312-291 | Mobile | Greater Metro Area | Sprint |
| 312-477 | Mobile | Greater Metro Area | Sprint |
| 312-444 | Mobile | Greater Metro Area | Sprint |
| 312-731 | Mobile | Greater Metro Area | Verizon Wireless |
| 312-261 | Mobile | Greater Metro Area | Verizon Wireless |
| 312-735 | Landline | Greater Metro Area | T-Mobile |