| Postal Service | Longmont |
| Division | Boulder |
| Post code | 80501 |
| Postal Service | Longmont |
| Division | Boulder |
| Post code | 80503 |
| Postal Service | Louisville |
| Division | Boulder |
| Post code | 80027 |
| Postal Service | Lafayette |
| Division | Boulder |
| Post code | 80026 |
| Postal Service | Boulder |
| Division | Boulder |
| Post code | 80302 |
| Postal Service | Boulder |
| Division | Boulder |
| Post code | 80304 |
| Postal Service | Boulder |
| Division | Boulder |
| Post code | 80301 |
| Postal Service | Boulder |
| Division | Boulder |
| Post code | 80303 |
| Postal Service | Boulder |
| Division | Boulder |
| Post code | 80305 |
| Postal Service | Boulder |
| Division | Boulder |
| Post code | 80310 |
13 City in Boulder | List of Zip Codes Location In Colorado and Your selected County Boulder