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County profile
About Boulder County
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.
Description adapted from Wikipedia, CC BY-SA 4.0.
At a glance
Boulder County at a glance
- County seat
- Boulder
- Population
- 330,758 (2020)
- Land area
- 751 sq mi
- Founded
- 1861
Communities
Largest communities in Boulder County
| Community | Population |
|---|---|
| Boulder County seat | 108,250 |
| Longmont | 98,885 |
| Lafayette | 30,411 |
| Erie | 30,038 |
| Louisville | 21,226 |
History
History of Boulder County
Boulder County was one of the original 17 counties created by the Territory of Colorado on November 1, 1861. The county was named for Boulder City and Boulder Creek, so named because of the abundance of boulders in the creek which hampered early gold prospecting efforts. Boulder County retains essentially the same borders as in 1861, although a 27.5 square miles (71.2 km2) of its southeastern corner and its approximate population of 40,000 became part of the City and County of Broomfield in 2001. Before the arrival of the first US settlers, the area was occupied by Native Americans led by Chief Niwot on the plains and seasonally by Utes in the mountains to the west. The first European American settlers were gold prospectors led by Captain Thomas Aikins. His group of about twenty settled at the mouth of Boulder Creek Canyon on October 17, 1858.
Adapted from Wikipedia, CC BY-SA 4.0.
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Official channels
Boulder County election resources
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Neighbors
Neighboring counties
About
Part of Colorado Voter Check
This is the Boulder County page of Colorado Voter Check, a project of True the Vote, pointing Colorado voters at the official tools that already exist — and at Scan Check Protect to verify your registration.
Where anything here differs from what Boulder County or the Colorado Secretary of State publishes, they are right and this page is not.