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 |
|---|---|---|---|
| 303-672 | Landline | Greater Metro Area | Verizon Wireless |
| 303-818 | Landline | Greater Metro Area | Sprint |
| 303-945 | Mobile | Greater Metro Area | T-Mobile |
| 303-956 | Mobile | Greater Metro Area | AT&T |
| 303-230 | Mobile | Greater Metro Area | Verizon Wireless |
| 303-389 | Mobile | Greater Metro Area | Verizon Wireless |
| 303-942 | Mobile | Greater Metro Area | Sprint |
| 303-946 | Mobile | Greater Metro Area | T-Mobile |
| 303-272 | Landline | Greater Metro Area | Verizon Wireless |
| 303-265 | Landline | Greater Metro Area | T-Mobile |
| 303-645 | Mobile | Greater Metro Area | Verizon Wireless |
| 303-486 | Landline | Greater Metro Area | AT&T |
| 303-952 | Landline | Greater Metro Area | Sprint |
| 303-358 | Landline | Greater Metro Area | Verizon Wireless |
| 303-686 | Landline | Greater Metro Area | Verizon Wireless |
| 303-383 | Mobile | Greater Metro Area | Sprint |
| 303-457 | Landline | Greater Metro Area | Verizon Wireless |
| 303-975 | Mobile | Greater Metro Area | AT&T |
| 303-724 | Mobile | Greater Metro Area | Verizon Wireless |
| 303-384 | Mobile | Greater Metro Area | Verizon Wireless |
| 303-377 | Landline | Greater Metro Area | AT&T |
| 303-454 | Landline | Greater Metro Area | Sprint |
| 303-777 | Landline | Greater Metro Area | Sprint |
| 303-220 | Mobile | Greater Metro Area | Sprint |
| 303-543 | Landline | Greater Metro Area | T-Mobile |
| 303-475 | Landline | Greater Metro Area | AT&T |
| 303-452 | Landline | Greater Metro Area | Verizon Wireless |
| 303-697 | Landline | Greater Metro Area | Verizon Wireless |
| 303-546 | Landline | Greater Metro Area | Sprint |
| 303-318 | Mobile | Greater Metro Area | Verizon Wireless |