Thornton, CO Area Codes
Thornton is served by area codes 303, 720 and 983. It is in Colorado, Adams County. About 34,082 people live in its 1 ZIP codes.
| Field | Value |
|---|---|
| Area code(s) | 303, 720, 983 |
| State / province | Colorado |
| County | Adams County |
| Population | 34,082 |
| ZIP codes | 1 |
| Time zone | Mountain |
| Coordinates | 39.9291, -104.9543 |
What area code is Thornton in?
| Area code | Main state | Population covered | Overlap |
|---|---|---|---|
| 303 | Colorado | 3,294,473 | — |
| 720 | Colorado | 3,294,174 | Yes |
| 983 | Colorado | 3,276,231 | Yes |
ZIP codes in the code footprint
Nearby towns and their area codes
Henderson 303, 720, 983Broomfield 303, 720, 983Westminster 303, 720, 983Commerce City 303, 720, 983Brighton 303, 720, 983Erie 303, 720, 983Lafayette 303, 720, 983Louisville 303, 720, 983
How to dial
Dial 303 + 7 digits for a number in Thornton, or +1 303 ... from abroad. Ten-digit dialling is required everywhere in the North American Numbering Plan.