Longmont zipcode
| City | Longmont |
| ZIP Code | 80503 |
| Type | Standard |
| State Code | CO |
| State | Colorado |
ZIP code of Longmont is 80503. This place is located in Colorado state in US. To send any postal service to Longmont, you must use 80503 zipcode.
The ZIP code 80503 is also used with 1 more city name of Colorado.
- Niwot, CO