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 |
|---|---|---|---|
| 312-703 | Landline | Greater Metro Area | Sprint |
| 312-232 | Landline | Greater Metro Area | Sprint |
| 312-779 | Landline | Greater Metro Area | Sprint |
| 312-244 | Mobile | Greater Metro Area | Sprint |
| 312-987 | Mobile | Greater Metro Area | T-Mobile |
| 312-934 | Mobile | Greater Metro Area | AT&T |
| 312-805 | Mobile | Greater Metro Area | T-Mobile |
| 312-479 | Landline | Greater Metro Area | T-Mobile |
| 312-540 | Mobile | Greater Metro Area | Verizon Wireless |
| 312-903 | Landline | Greater Metro Area | AT&T |
| 312-904 | Mobile | Greater Metro Area | Sprint |
| 312-733 | Landline | Greater Metro Area | Sprint |
| 312-412 | Landline | Greater Metro Area | T-Mobile |
| 312-835 | Landline | Greater Metro Area | Verizon Wireless |
| 312-968 | Mobile | Greater Metro Area | Verizon Wireless |
| 312-682 | Landline | Greater Metro Area | Verizon Wireless |
| 312-535 | Landline | Greater Metro Area | T-Mobile |
| 312-930 | Mobile | Greater Metro Area | Sprint |
| 312-566 | Landline | Greater Metro Area | Verizon Wireless |
| 312-390 | Mobile | Greater Metro Area | Sprint |
| 312-235 | Mobile | Greater Metro Area | Verizon Wireless |
| 312-737 | Mobile | Greater Metro Area | Verizon Wireless |
| 312-329 | Mobile | Greater Metro Area | Verizon Wireless |
| 312-435 | Landline | Greater Metro Area | T-Mobile |
| 312-856 | Landline | Greater Metro Area | Sprint |
| 312-850 | Mobile | Greater Metro Area | Verizon Wireless |
| 312-894 | Mobile | Greater Metro Area | AT&T |
| 312-356 | Landline | Greater Metro Area | Sprint |
| 312-500 | Landline | Greater Metro Area | AT&T |
| 312-557 | Mobile | Greater Metro Area | Verizon Wireless |