Coverage Map
Interactive
Showing coverage area for Area Code 303 in Colorado.
Top Cities
| City Name | Type |
|---|---|
| Denver | Principal |
| North Valleyfield | Principal |
| South Ridgeside | Principal |
| Ridgefield | Principal |
| Old Stonefield | Principal |
| Havenland | Principal |
| Springburg | Principal |
| Creekfield | Principal |
| Stoneside | Principal |
| Creekton | 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 |
Counties Served
| County | State |
|---|---|
| Denver County | Colorado |
| Jefferson County | Colorado |
| Arapahoe County | Colorado |
| Adams County | Colorado |
| Boulder County | Colorado |
| Douglas County | Colorado |
Active Phone Prefixes
Recently Assigned
| Prefix | Usage | Location | Carrier |
|---|---|---|---|
| 303-433 | Mobile | Greater Metro Area | AT&T |
| 303-752 | Mobile | Greater Metro Area | Verizon Wireless |
| 303-696 | Landline | Greater Metro Area | Sprint |
| 303-670 | Landline | Greater Metro Area | AT&T |
| 303-693 | Mobile | Greater Metro Area | T-Mobile |
| 303-615 | Landline | Greater Metro Area | AT&T |
| 303-459 | Landline | Greater Metro Area | Verizon Wireless |
| 303-717 | Landline | Greater Metro Area | AT&T |
| 303-526 | Mobile | Greater Metro Area | AT&T |
| 303-758 | Landline | Greater Metro Area | AT&T |
| 303-822 | Mobile | Greater Metro Area | Verizon Wireless |
| 303-489 | Landline | Greater Metro Area | AT&T |
| 303-958 | Mobile | Greater Metro Area | Sprint |
| 303-615 | Landline | Greater Metro Area | AT&T |
| 303-349 | Mobile | Greater Metro Area | T-Mobile |
| 303-563 | Mobile | Greater Metro Area | Verizon Wireless |
| 303-831 | Landline | Greater Metro Area | T-Mobile |
| 303-335 | Landline | Greater Metro Area | AT&T |
| 303-324 | Mobile | Greater Metro Area | Sprint |
| 303-234 | Mobile | Greater Metro Area | AT&T |
| 303-301 | Landline | Greater Metro Area | T-Mobile |
| 303-637 | Mobile | Greater Metro Area | Sprint |
| 303-871 | Mobile | Greater Metro Area | Verizon Wireless |
| 303-656 | Landline | Greater Metro Area | Verizon Wireless |
| 303-870 | Landline | Greater Metro Area | T-Mobile |
| 303-324 | Mobile | Greater Metro Area | Sprint |
| 303-644 | Landline | Greater Metro Area | AT&T |
| 303-756 | Landline | Greater Metro Area | Sprint |
| 303-566 | Mobile | Greater Metro Area | Verizon Wireless |
| 303-405 | Mobile | Greater Metro Area | Verizon Wireless |