On July 21, 2023, the United States Office of Management and Budget defined the 12-county Denver-Aurora-Greeley, CO Combined Statistical Area as comprising the ten-county Denver–Aurora–Centennial, CO
Skyline of Downtown Denver
Boulder County, Colorado
Videos
Boulder County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 330,758. The most populous municipality in the county and the county seat is Boulder. Boulde
Denver–Aurora–Greeley combined statistical area
…Denver-Aurora-Greeley, CO Combined Statistical Area as comprising the ten-county Denver–Aurora–Centennial, CO Metropolitan Statistical Area, the single-county Boulder, CO Metropolitan Statistical Area, and the single-county Greeley, CO Metropolitan Statistical Area. The United States Census Bureau estimates that the population was 3,752,505 as of…
Boulder County Courthouse
View of the eastern and southern borders of Boulder County and adjacent areas in Weld, Broomfield, and Jefferson counties, with north oriented to the left. The city of Boulder is near the lower border. Taken from the International Space Station on July 1, 2022.
Boulder and the mountains to the west of the city