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Boulder is a home rule city and the county seat of Boulder County, Colorado, located at the base of the Rocky Mountain foothills about 25 miles (40 km) northwest of Denver.

The city was settled in late 1858 as Boulder City by prospectors led by Thomas Aikins during the Colorado Gold Rush, and gold was discovered along Boulder Creek in early 1859.

Boulder was incorporated on November 4, 1871, and it remains the most populous municipality in Boulder County.

The 2020 United States census counted 108,250 residents in Boulder, making it the 12th most populous city in Colorado.

The 2020 census counted 43,565 households in Boulder, a figure shaped by the large student population at the university.

Boulder is home to the University of Colorado Boulder, the flagship and largest campus of the University of Colorado system, which officially opened on September 5, 1877.

The Flatirons, five tilted slabs of sedimentary rock rising in the foothills west of the city, are Boulder's most widely recognized natural landmark.

The Pearl Street Mall, a brick-paved pedestrian mall lined with shops and restaurants, anchors Boulder's downtown.

In 1959, Boulder voters approved the "Blue Line" charter amendment, which restricted city water service to elevations below 5,750 feet to protect the mountain backdrop from development.

In 1967, Boulder voters approved a dedicated sales tax to acquire open space, and the city's Open Space and Mountain Parks department now manages roughly 8,000 acres of protected forest land west of the city.