Area Code 303
| Area Code | 303 |
|---|---|
| Region | Denver |
| In service since | 1947 |
| Overlaid with | 720, 983 |
| Time zone | Mountain Time |
| Associated Places | 143 |
| State | Colorado |
| Regions |
Adams County Arapahoe County Boulder County Broomfield County Clear Creek County Denver County Douglas County Elbert County Gilpin County Jefferson County Summit County Weld County |
| Largest Place | Denver |
| Smallest Place | Lakeside |
143 locations are currently recorded for area code 303. The locations are in a federal state and 12 regions.
Places with the area code 303
The table lists all recorded locations for the area code 303 and shows the corresponding ZIP code, the location name, the County, and the State in each row.
Largest places with area code 303
The selection shows populous places that start with area code 303 or are directly assigned to this dialing region.
