Denver Counties

County information and links to helpful resources for the Denver area counties.

Adams County

Adams County, CO

Adams County, Colorado

In 1902, voters approved creation of Adams County which, prior to that time, had been part of an enormous Arapahoe County.  The county was named after Alva Adams, a popular former governor who was in office at the time of this election. The county courthouse was temporarily housed in the residence of Daniel Carmichael (the founder of Brighton) in Brighton.  After a fire destroyed these offices in January 1904, the offices were relocated to a rented house at 3rd and Bridge Street in Brighton.

In an election held November 8, 1904, Brighton was chosen as the permanent county seat and, as was befitting a new and prosperous county, a new courthouse was built at 4th and Bridge Street in 1906.  That building still stands as the eastern half of the Brighton City Hall.

With spectacular views of the Rockies, Adams County offers convenient access to downtown Denver, and the Denver International Airport.  Adams County includes the cities of Aurora, Bennett, Brighton, Commerce City, Federal Heights, Northglenn, Strasburg, Thornton and Westminster.  Adams County is one of the largest and fastest growing counties in the Denver metropolitan area.

Arapahoe County

Arapahoe County, CO

Arapahoe County, Colorado

Arapahoe County offers convenient access to the South Denver Metro Area, excellent transportation with access to Hwy 470 and I-25, as well as the souther RTD stations.   Business thrives in Arapahoe county and the Denver Tech Center, and the county continues to grow and expand it’s economy.

Arapahoe County is the state’s first county and one of the largest with a population of more than 550,000. Arapahoe County was named for the Arapaho Indians, who along with the Cheyenne Indians, occupied most of Colorado when it was only a territory.

Back then, Arapahoe County was much larger – stretching east to western Kansas. Denver was the original County seat until 1902 when the city split off and became a separate county. The City of Littleton became the new county seat and remains the county seat today. The County Administration Building is located at 5334 S. Prince Street in Littleton, Colorado.

Boulder County

Boulder County, Colorado

Boulder County, Colorado

Boulder County is large and diverse, featuring everything from the spectacular scenery of Rocky Mountain National Park (a national treasure) to lush farmland, and one of the nation’s largest concentrations of research laboratories and high-tech industry.

Situated in the north-central part of Colorado, Northwest of Denver, the western border of the County is the Continental Divide. The eastern half of the County is rolling plains, and the western half is mountainous.

The territory within Boulder County first became part of the United States in 1803 with the Louisiana Purchase.  In 1861 the Colorado Territory was created with Boulder being one of the 17 counties represented in the first Territorial Assembly.

Today Boulder County remains diversified, with both rural and urban settings. The University of Colorado at Boulder, two school districts and numerous scientific, research and recreational facilities are among the attributes of the County. The Denver Regional Council of Governments estimates Boulder County’s population at approximately 294,000, with about 103,100 in the City of Boulder, another 84,636 in the City of Longmont, 26,453 in Lafayette, 19,000 in Louisville and the remainder dispersed throughout the smaller towns of Lyons, Nederland, Ward, Jamestown, Superior and Erie and unincorporated areas, including the communities of Niwot, Gunbarrel and Allenspark.

The County encompasses 741 square miles and is situated on the eastern slope of the Rocky Mountains. Elevations within the boundaries of the County vary from the 5,000-foot level of the plains to the 14,000-foot peaks of the Continental Divide.

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  • Visit the Boulder County Website for more information on Boulder County, Colorado

Denver County

Denver County, Colorado

Denver County, Colorado

Denver is a consolidated city-county, located in the South Platte River Valley on the High Plains, just east of the Front Range of the Rocky Mountains. The county of Denver is the most populous county in the State of Colorado with an estimated population of 610,345 in 2009, making it the 24th most populous city in the United States.  The Denver metro area also had an estimated 2009 population of 2,552,195 and ranked as the 21st most populous U.S. metropolitan statistical area.

The Denver downtown district is located approximately 12.8 miles (21 km) east of the foothills of the Rocky Mountains.  Denver is nicknamed the “Mile-High City” because its official elevation is exactly one mile, or 5,280 feet (1,609 m) above sea level.   The 105th meridian west of Greenwich passes through Union Station and is the temporal reference for the Mountain Time Zone.

Denver has something for everyone – great business community, relatively low cost of living, high quality of living and plenty of good weather and access to outdoors activities.   Denver is also one of the most fit cities in the United States, taking advantage of the 300+ days of sunshine and convenient access a large variety of activities.

Douglas County

Douglas County, Colorado

Douglas County, Colorado

Douglas County was one of the original 17 counties created in the Colorado Territory by the Colorado Territorial Legislature on November 1, 1861. The county was named in honor of U.S. Senator Stephen A. Douglas of Illinois, who died five months before the county was created. The county seat was originally Franktown, but was moved to California Ranch in 1863, and then to Castle Rock in 1874, where it is currently still the county seat.

According to the U.S. Census Bureau, the county has a total area of 843 square miles (2,183 km²), of which, 840 square miles (2,176 km²) of it is land and 3 square miles (7 km²) of it (0.31%) is water.

Douglas County is the eighth most populous of the 64 counties of the State of Colorado. The county is located midway between Colorado’s two largest cities: Denver and Colorado Springs. The United States Census Bureau estimates that the county population was 280,621 in 2008, a 59.7% increase since U.S. Census 2000, making Douglas County one of the fastest growing counties in the United States. Douglas County includes the cities of Parker, Castle Rock, Littleton (Partial), Lone Tree, Castle Pines North, Larkspur and Highlands Ranch.

Douglas County is lightly wooded, mostly with ponderosa pine, with broken terrain characterized by mesas and small streams. Cherry Creek and Plum Creek rise in Douglas County and flow north toward Denver and into the South Platte River. Both were subject to flash flooding in the past, Plum Creek being partially responsible for the Denver flood of 1965. Cherry Creek is now dammed.

Most residents commute to workplaces elsewhere in the metropolitan area outside of the county. Suburban development is displacing the ranching economy of the county.

Jefferson County

Jefferson County, CO

Jefferson County, Colorado

Jefferson County is the fourth most populous of the 64 counties of the State of Colorado of the United States. The United States Census Bureau estimates that the county population was 533,339 in 2008. The county seat is Golden and the most populous city is Lakewood. Jefferson County is part of the Denver-Aurora Metropolitan Statistical Area and the Denver-Aurora-Boulder Combined Statistical Area. The center of population of the State of Colorado is located in Jefferson County.

Located along the Front Range of the Rocky Mountains, Jefferson County is part of the Denver metropolitan area. The major expressway Interstate 70 traverses Jefferson County from east-to-west, passing just south of the county seat of Golden. Jefferson County is a quite long county from north to south, following the Front Range. The county is known as the Gateway to the Rocky Mountains.

A major employer in Jefferson County is the large Coors Brewing Company in Golden. Also, the state-supported Colorado School of Mines is located in Jefferson County, offering programs in mining and engineering.

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  • Visit the Jefferson County Website for more information on Jefferson County, Colorado
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