List of ZIP Codes in Boulder County
The following table lists ZIP Codes associated with Boulder County, Colorado, based on ZIP Code Tabulation Area (ZCTA) data from the U.S. Census Bureau.
| S.N. | Zip Code | Latitude | Longitude | City | Population | Density |
|---|---|---|---|---|---|---|
| 1 | 80025 | 39.92444 | -105.29226 | Eldorado Springs | 101 | 9.6 |
| 2 | 80026 | 40.01188 | -105.0985 | Lafayette | 32,549 | 558.3 |
| 3 | 80027 | 39.9508 | -105.16354 | Louisville | 33,998 | 704.7 |
| 4 | 80301 | 40.04795 | -105.19876 | Boulder | 25,252 | 340.3 |
| 5 | 80302 | 40.0306 | -105.35542 | Boulder | 29,751 | 122.3 |
| 6 | 80303 | 39.97422 | -105.21206 | Boulder | 24,934 | 439.9 |
| 7 | 80304 | 40.04557 | -105.29006 | Boulder | 25,634 | 1096.5 |
| 8 | 80305 | 39.97733 | -105.24877 | Boulder | 16,101 | 1068.1 |
| 9 | 80310 | 40.00465 | -105.26254 | Boulder | 7,530 | 5332.3 |
| 10 | 80455 | 40.11071 | -105.39071 | Jamestown | 378 | 4.5 |
| 11 | 80466 | 39.99008 | -105.546 | Nederland | 3,469 | 11.6 |
| 12 | 80471 | 39.93507 | -105.42048 | Pinecliffe | 0 | 0.0 |
| 13 | 80481 | 40.10351 | -105.52253 | Ward | 477 | 4.2 |
| 14 | 80501 | 40.16479 | -105.10208 | Longmont | 43,591 | 1333.9 |
| 15 | 80503 | 40.16922 | -105.20725 | Longmont | 36,206 | 152.4 |
| 16 | 80510 | 40.20964 | -105.57878 | Allenspark | 705 | 4.1 |
| 17 | 80540 | 40.23186 | -105.39341 | Lyons | 4,620 | 11.7 |
| 18 | 80544 | 40.10305 | -105.17178 | Niwot | 0 | 0.0 |
About Boulder County ZIP Codes
Boulder County in Colorado (CO) is served by approximately 18 ZIP Codes. These codes cover residential neighborhoods, business districts, and rural areas that fall under the county's jurisdiction.
Based on ZIP-level population estimates, the total population covered by these ZIP Codes is around 285,296 people. Population and density values vary from one ZIP Code to another, reflecting the mix of dense urban communities and lower-density suburban or rural zones.
Many of the most significant population centers in Boulder County are located in cities such as Boulder, Longmont, Louisville, Lafayette, Lyons. These cities and towns help define the economic and demographic character of the county.
Most ZIP Codes in Boulder County, Colorado follow the America/Denver time zone.
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