Boulder is the 11th most populous city in the state of Colorado. The United States Census Bureau estimates that in 2005 the population of the city of Boulder was 91,685, while the population of the Boulder Metropolitan Statistical Area was 280,440. Boulder is the home of the main campus of the University of Colorado, the state's largest university, and Naropa University, one of two accredited Buddhist-inspired universities in the United States. Located at the base of the foothills of the Rocky Mountains at an elevation of 5,430 feet, Boulder is 25 miles northwest of Denver.