Grand County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 15,717.^[1] The county seat is Hot Sulphur Springs.^[2]

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Grand County
County
The Grand County Judicial Center in Hot Sulphur Springs, July 2016
Seal
Location within the U.S. state of Colorado
Colorado's location within the U.S.
Coordinates: 40.10°N 106.12°W / 40.10; -106.12
Country	United States
State	Colorado
Founded	February 2, 1874
Named for	Grand Lake and Grand River
Seat	Hot Sulphur Springs
Largest town	Granby
Area
• Total	1,870 sq mi (4,800 km2)
• Land	1,846 sq mi (4,780 km2)
• Water	23 sq mi (60 km2)  1.2%
Population  (2020)
• Total	15,717
• Density	8.5/sq mi (3.3/km2)
Time zone	UTC−7 (Mountain)
• Summer (DST)	UTC−6 (MDT)
Congressional district	2nd
Website	co.grand.co.us

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When Grand County was created on February 2, 1874, it was carved out of Summit County and contained land to the western and northern borders of the state, which is in present-day Moffat County and Routt County. It was named after Grand Lake and the Grand River,^[3] an old name for the upper Colorado River, which has its headwaters in the county. On January 29, 1877, Routt County was created and Grand County shrunk down to its current western boundary. When valuable minerals were found in North Park, Grand County claimed the area as part of its county, a claim Larimer County also held. It took a decision by the Colorado Supreme Court in 1886 to declare North Park part of Larimer County, setting Grand County's northern boundary.

In 2004, Marvin John Heemeyer a local businessman from Granby used an armoured vehicle to destroy parts of the town of Granby. This was after the government ruined his business.^[4] He was stopped when he ran out of fuel and he committed suicide.

According to the U.S. Census Bureau, the county has a total area of 1,870 square miles (4,800 km²), of which 1,846 square miles (4,780 km²) is land and 23 square miles (60 km²) (1.2%) is water.^[5]

At the 2000 census, there were 12,442 people in 5,075 households, including 3,217 families, in the county. The population density was 7 people per square mile (2.7 people/km²). There were 10,894 housing units at an average density of 6 units per square mile (2.3 units/km²). The racial makeup of the county was 95.15% White, 0.48% Black or African American, 0.43% Native American, 0.68% Asian, 0.10% Pacific Islander, 2.00% from other races, and 1.15% from two or more races. 4.36% of the population were Hispanic or Latino of any race. 23.8% were of German, 12.6% Irish, 10.0% English and 7.3% American ancestry.^[11] Of the 5,075 households 28.10% had children under the age of 18 living with them, 54.70% were married couples living together, 5.20% had a female householder with no husband present, and 36.60% were non-families. 24.80% of households were one person and 4.80% were one person aged 65 or older. The average household size was 2.37 and the average family size was 2.85.

The age distribution was 21.80% under the age of 18, 9.00% from 18 to 24, 34.70% from 25 to 44, 26.80% from 45 to 64, and 7.80% 65 or older. The median age was 37 years. For every 100 females there were 112.70 males. For every 100 females age 18 and over, there were 115.70 males.

The median household income was $47,759 and the median family income was $55,217. Males had a median income of $34,861 versus $26,445 for females. The per capita income for the county was $25,198. About 5.40% of families and 7.30% of the population were below the poverty line, including 7.90% of those under age 18 and 6.10% of those age 65 or over.

Unlike many counties dominated by a ski town, Grand County leans Republican. However, the town of Winter Park, where the Winter Park Ski Resort is located, is solidly Democratic.

• Bibliography of Colorado
• Geography of Colorado
• History of Colorado
  • Saratoga County, Jefferson Territory
  • National Register of Historic Places listings in Grand County, Colorado
• Index of Colorado-related articles
• List of Colorado-related lists
  • List of counties in Colorado
• Outline of Colorado