Boulder, CO Area Codes
Boulder is served by area codes 303, 720 and 983. It is in Colorado, Boulder County. About 128,938 people live in its 11 ZIP codes.
| Field | Value |
|---|---|
| Area code(s) | 303, 720, 983 |
| State / province | Colorado |
| County | Boulder County |
| Population | 128,938 |
| ZIP codes | 11 |
| Time zone | Mountain |
| Coordinates | 40.0355, -105.3042 |
What area code is Boulder 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
80301, 80302, 80303, 80304, 80305, 80306, 80307, 80308, 80309, 80310, 80314
Nearby towns and their area codes
Louisville 303, 720, 983Lafayette 303, 720, 983Longmont 303, 720, 983Broomfield 303, 720, 983Erie 303, 720, 983Arvada 303, 720, 983Westminster 303, 720, 983Golden 303, 720, 983
How to dial
Dial 303 + 7 digits for a number in Boulder, or +1 303 ... from abroad. Ten-digit dialling is required everywhere in the North American Numbering Plan.