Boulder is a home rule city in Boulder County, Colorado, United States, and its county seat. With a population of 108,250 at the 2020 census, it is the most populous city in the county and the 12th-most populous city in Colorado. It is the principal city of the Boulder metropolitan statistical area, which had 330,758 residents in 2020 and is part of the Front Range Urban Corridor.
AdFind the top-rated and best-reviewed tours and activities in Boulder, Colorado for 2025. The Best Boulder, Colorado Tours and Things to Do in 2025 - Free Cancellation
Site visitors: Over 1M in the past month
Thousands of destinations · Convenient mobile booking · Easy price comparison