Boulder County is located in the state of Colorado, United States. It was one of the original 17 counties created by the Territory of Colorado on November 1, 1861. The county was named for Boulder City and Boulder Creek, chosen due to the large boulders found in the area which initially hampered gold prospecting efforts. Boulder City, now simply Boulder, serves as the county seat, making it the administrative center. Over the years, Boulder County has maintained its original borders, except for a southeastern portion that became part of the City and County of Broomfield in 2001.

Throughout its history, Boulder County has witnessed significant events, including the presence of Native American tribes such as the Ute and Arapaho before the arrival of European American settlers. The county's development was significantly influenced by the Colorado Gold Rush, with the first gold prospectors settling at the mouth of Boulder Creek Canyon. In recent times, the county has faced challenges such as the Marshall Fire in December 2021, the most destructive fire in Colorado's history, impacting cities like Superior and Louisville and unincorporated Boulder County areas.


Boulder County spans a total area of 740 square miles, of which 726 square miles is land and 14 square miles is water. It is characterized by a diverse landscape that includes the eastern and southern borders of the county and adjacent areas in Weld, Broomfield, and Jefferson counties. The geography ranges from flat plains to the rugged terrain of the Rocky Mountains, providing a mix of natural beauty and outdoor recreational opportunities.

The county is home to several protected areas, including portions of the Arapaho and Roosevelt National Forests, the Indian Peaks Wilderness, and the James Peak Wilderness. Rocky Mountain National Park, a significant portion of which lies within Boulder County, features Longs Peak, the park's highest summit. The county also offers scenic trails and byways, such as the Continental Divide National Scenic Trail and the Peak to Peak Scenic and Historic Byway.


As of the 2020 census, Boulder County had a population of 330,758. The demographic composition has evolved over the years, reflecting changes in population growth and distribution. The population density stands at 392 people per square mile, indicating a mix of urban and rural living environments. The racial and ethnic makeup of the county is diverse, contributing to a rich cultural fabric. Boulder County's communities are supported by a variety of housing, education, and health services designed to meet the needs of its residents.

The county's demographic profile is shaped by its history, geography, and the presence of educational institutions like the University of Colorado Boulder. This has attracted a vibrant mix of students, families, professionals, and retirees, making Boulder County a dynamic and diverse community.

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