Boulder County, Colorado
Boulder County is a county in Colorado. Its county FIPS code is 08013. Use the boundary map and neighboring areas below to check the jurisdiction you need.
- Official code
- 08013
- Representative coordinates
- 40.094971, -105.397710
- County type
- County
- County seat or government
- Boulder
- Resident population, July 2025
- 328,560
- Land area
- 1,881.409 km²
- Water area
- 36.404 km²
- State
- Colorado
The representative point identifies this area. It is not a street address or a boundary survey.
Time zones in Boulder County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| America/Denver | UTC-07:00 in January; UTC-06:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Listed zones overlap the mapped area. A point lookup can distinguish sides of a boundary. Your device’s zone may differ.
Census ZIP areas
80020 · 80025 · 80026 · 80027 · 80301 · 80302 · 80303 · 80304 · 80305 · 80310 · 80403 · 80455 · 80466 · 80471 · 80481 · 80501 · 80503 · 80504 · 80510 · 80513 · 80516 · 80540 · 80544
These statistical areas overlap the boundary. They are not delivery assignments; confirm mailing details with USPS ZIP Code Lookup.
Official county information
Use the US government local-office directory ↗ to find the office responsible for your address. A county website has not been confidently matched here. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Cities, towns and communities
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Allenspark CDP, CO
- Altona CDP, CO
- Bark Ranch CDP, CO
- Bonanza Mountain Estates CDP, CO
- Boulder city, CO
- Coal Creek CDP, CO
- Crisman CDP, CO
- Eldora CDP, CO
- Eldorado Springs CDP, CO
- Erie town, CO
- Glendale CDP, CO
- Gold Hill CDP, CO
- Gunbarrel CDP, CO
- Hidden Lake CDP, CO
- Jamestown town, CO
- Lafayette city, CO
- Lazy Acres CDP, CO
- Leyner CDP, CO
- Longmont city, CO
- Louisville city, CO
- Lyons town, CO
- Mountain Meadows CDP, CO
- Nederland town, CO
- Niwot CDP, CO
- Paragon Estates CDP, CO
- Pine Brook Hill CDP, CO
- St. Ann Highlands CDP, CO
- Seven Hills CDP, CO
- Sugarloaf CDP, CO
- Sunshine CDP, CO
Areas sharing the mapped boundary
These areas touch this mapped boundary.
Before using this answer on a form
Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.
Find the county at your current point, check its ZIP area, or find its physical time zone.