Boulder is the home rule municipality that is the county seat and the most populous municipality of Boulder County, and the 11th most populous municipality in the U.S. state of Colorado. 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 United States Census,[11] while the population of the Boulder, CO Metropolitan Statistical Area was 294,567.

Boulder is famous for its colorful Western history, being a choice destination for hippies in the late 1960s, and as home of the main campus of the University of Colorado, the state’s largest university. Furthermore, the city of Boulder frequently receives high rankings in art, health, well-being, quality of life, and education.

On November 7, 1861, legislation was passed making way for the state university to be located in Boulder, and on September 20, 1875, the first cornerstone was laid for the first building (Old Main Building) on the CU campus. The university officially opened on September 5, 1877.

Boulder adopted an anti-saloon ordinance in 1907. Statewide prohibition started in Colorado in 1916 and ended with the repeal of national prohibition in 1933.

As of the census of 2010, there were 97,385 people, 41,302 households, and 16,694 families residing in the city. The population density is 3,942.7 inhabitants per square mile (1,524.0/km²). There were 43,479 housing units at an average density of 1,760.3 per square mile (680.4/km²). The racial makeup of the city was 88.0% White, 0.9% Black or African American, 0.4% Native American, 4.7% Asian, 0.1% Pacific Islander, 3.2% some other race, and 2.6% from two or more races. 8.7% of the population are Hispanic or Latino of any race.