Grand County is one of the 64 counties in the U.S. state of Colorado. As of the 2010 census, the population was 14,843. The county seat is Hot Sulphur Springs.
According to the U.S. Census Bureau, the county has a total area of 1,870 square miles (4,800 km), of which 1,846 square miles (4,780 km) is land and 23 square miles (60 km) (1.2%) is water.
As of the census of 2000, there were 12,442 people, 5,075 households, and 3,217 families residing in the county. The population density was 7 people per square mile (3/km²). There were 10,894 housing units at an average density of 6 per square mile (2/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.
There were 5,075 households out of which 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 all households were made up of individuals and 4.80% had someone living alone who was 65 years of age or older. The average household size was 2.37 and the average family size was 2.85.
In the county, the population was spread out with 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% who were 65 years of age 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 income for a household in the county was $47,759, and the median income for a family 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.
Grand County Colorado neighborhoods include: Columbine Lake, Grand Lake Shadow Mtn, Grand Lake Village, Lyons Homestead, Mountain Meadows/Pine Beach