Boulder (/ˈboʊldər/) is the home rule municipality that is the county seat and the most populous municipality of Boulder County, Colorado, United States. It is the state's 11th most populous municipality; Boulder is located at the base of the foothills of the Rocky Mountains at an elevation of 5,430 feet (1,655 m) above sea level. The city is 25 miles (40 km) northwest of Denver.
The population of the City of Boulder was 97,385 people at the 2010 U.S. Census, while the population of the Boulder, CO Metropolitan Statistical Area was 294,567. Boulder is known for its association with American fr...
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