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 |
|---|---|---|---|
| 303-517 | Mobile | Greater Metro Area | AT&T |
| 303-437 | Mobile | Greater Metro Area | AT&T |
| 303-959 | Landline | Greater Metro Area | Verizon Wireless |
| 303-347 | Landline | Greater Metro Area | Sprint |
| 303-737 | Landline | Greater Metro Area | Verizon Wireless |
| 303-272 | Mobile | Greater Metro Area | T-Mobile |
| 303-496 | Landline | Greater Metro Area | Verizon Wireless |
| 303-486 | Mobile | Greater Metro Area | T-Mobile |
| 303-740 | Landline | Greater Metro Area | Verizon Wireless |
| 303-406 | Landline | Greater Metro Area | Verizon Wireless |
| 303-968 | Mobile | Greater Metro Area | AT&T |
| 303-386 | Mobile | Greater Metro Area | Sprint |
| 303-752 | Landline | Greater Metro Area | Verizon Wireless |
| 303-477 | Mobile | Greater Metro Area | Sprint |
| 303-692 | Landline | Greater Metro Area | Verizon Wireless |
| 303-914 | Landline | Greater Metro Area | AT&T |
| 303-544 | Mobile | Greater Metro Area | Sprint |
| 303-749 | Mobile | Greater Metro Area | Verizon Wireless |
| 303-803 | Landline | Greater Metro Area | Sprint |
| 303-794 | Landline | Greater Metro Area | Verizon Wireless |
| 303-797 | Landline | Greater Metro Area | Sprint |
| 303-891 | Mobile | Greater Metro Area | T-Mobile |
| 303-716 | Landline | Greater Metro Area | T-Mobile |
| 303-886 | Mobile | Greater Metro Area | Sprint |
| 303-720 | Landline | Greater Metro Area | Verizon Wireless |
| 303-292 | Landline | Greater Metro Area | AT&T |
| 303-907 | Landline | Greater Metro Area | Sprint |
| 303-550 | Mobile | Greater Metro Area | Sprint |
| 303-265 | Landline | Greater Metro Area | AT&T |
| 303-977 | Mobile | Greater Metro Area | Verizon Wireless |