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County Information



Some of the cities, towns, and places in Boulder County are Allenspark, Altona, Bark Ranch, Bonanza Mountain Estates, Boulder, Canfield, Caribou, Coal Creek, Crisman, Eldora, Eldorado Springs, Erie, Gilpin County, Glendale, Gold Hill, Gooding, Gunbarrel, Hidden Lake, Hygiene, Jamestown, Jefferson County, Lafayette, Lazy Acres, Leyner, Liggett, Longmont, Louisville, Lyons, Mountain Meadows, Nederland, Niwot, Paragon Estates, Pine Brook Hill, Pinecliffe, Seven Hills, St. Ann Highlands, Sugarloaf, Sunshine, Superior, Tabor, Tall Timber, Town of Ward, Valmont, Weld County, Wondervu

Boulder County  Image

Boulder County is a county located in the U.S. state of Colorado of the United States. As of the 2020 census, the population was 330,758. The most populous municipality in the county and the county seat is Boulder.Boulder County comprises the Boulder, CO Metropolitan Statistical Area, which is included in the Denver–Aurora, CO Combined Statistical Area.