ZIP CodesZIP codes in Boulder County, Colorado
Boulder County, Colorado has 27 ZIP codes in this list, from 80020 to 80544. They cover 14 places, among them Boulder, Longmont, Broomfield and Eldorado Springs.
Nothing in this county matches.
| ZIP code | Place | Land area (sq mi) | Map point |
|---|---|---|---|
| 80020 | Broomfield | 19.8 | 39.925, -105.061 |
| 80025 | Eldorado Springs | 4.1 | 39.932, -105.288 |
| 80026 | Lafayette | 22.5 | 39.998, -105.096 |
| 80027 | Louisville | 18.6 | 39.979, -105.146 |
| 80038 | Broomfield | no area | 39.920, -105.087 |
| 80301 | Boulder | 28.6 | 40.050, -105.214 |
| 80302 | Boulder | 93.9 | 40.017, -105.285 |
| 80303 | Boulder | 21.9 | 39.991, -105.239 |
| 80304 | Boulder | 9.0 | 40.038, -105.277 |
| 80305 | Boulder | 5.8 | 39.981, -105.253 |
| 80306 | Boulder | no area | 40.102, -105.385 |
| 80307 | Boulder | no area | 40.088, -105.374 |
| 80308 | Boulder | no area | 40.028, -105.387 |
| 80309 | Boulder | no area | 40.015, -105.270 |
| 80310 | Boulder | 0.5 | 40.015, -105.270 |
| 80314 | Boulder | no area | 40.088, -105.374 |
| 80455 | Jamestown | 32.3 | 40.115, -105.389 |
| 80466 | Nederland | 116 | 39.970, -105.481 |
| 80471 | Pinecliffe | 0.7 | 39.932, -105.428 |
| 80481 | Ward | 43.7 | 40.073, -105.508 |
| 80501 | Longmont | 12.6 | 40.178, -105.101 |
| 80502 | Longmont | no area | 40.167, -105.102 |
| 80503 | Longmont | 91.7 | 40.156, -105.162 |
| 80510 | Allenspark | 65.9 | 40.227, -105.520 |
| 80533 | Hygiene | no area | 40.181, -105.233 |
| 80540 | Lyons | 153 | 40.236, -105.323 |
| 80544 | Niwot | 0.1 | 40.104, -105.171 |
The ZIP code areas of Boulder County add up to about 740 square miles of land (1,918 sq km) as the Census Bureau draws them. The largest is 80540 (Lyons), with 153 square miles.
Places with more than one code here: Boulder (11 codes), Longmont (3 codes), Broomfield (2 codes).
Using these codes
- In an address, the ZIP code comes last, after the city and the two-letter state: Broomfield, CO 80020.
- Tap a ZIP code to open it in the look-up, with a copy button for the address line.
- A code can cross a county line, and one town can have several codes. The table shows the main place of each code.
- "No area" means the Census Bureau draws no area for that code. Such codes are usually for post office boxes or a single building.
Places and counties: GeoNames. Areas: U.S. Census Bureau, 2024 ZIP Code Tabulation Areas. Checked in November 2026. This site is not connected with the United States Postal Service; for mailing, confirm the address with USPS.