Boulder County, Colorado
Boulder County, Colorado | |
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Boulder County Courthouse | |
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Seal | |
Location within the U.S. state of Colorado | |
| Coordinates: 40°05′N 105°22′W / 40.09°N 105.36°W | |
| Country | United States |
| State | Colorado |
| Founded | November 1, 1861 |
| Named after | large granite boulders in area |
| Seat | Boulder |
| Largest city | Boulder |
| Area | |
• Total | 740 sq mi (1,900 km2) |
| • Land | 726 sq mi (1,880 km2) |
| • Water | 14 sq mi (36 km2) 1.9% |
| Population (2020) | |
• Total | 330,758 |
• Estimate (2024) | 330,262 |
| • Density | 456/sq mi (176/km2) |
| Time zone | UTC−7 (Mountain) |
| • Summer (DST) | UTC−6 (MDT) |
| Congressional districts | 2nd, 4th |
| Website | www |
Boulder County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 330,758. The most populous municipality in the county and the county seat is Boulder. Boulder County comprises the Boulder, Colorado Metropolitan Statistical Area, which is included in the 12-county Denver-Aurora-Greeley, CO Combined Statistical Area.