Hot Sulphur Springs is a statutory town and the county seat of Grand County, Colorado, United States. The town is located near Byers Canyon between Granby and Kremmling, 95 miles (153 km) northwest of Denver and 30 miles (48 km) northwest of Winter Park. The town population was 663 at the 2010 census, and has an elevation of 7,680 feet (2,340 m).
Hot Sulphur Springs is located in central Grand County at 40°4′24″N 106°6′5″W / 40.07333°N 106.10139°W / 40.07333; -106.10139 (40.073318, -106.101470). It is located along the Colorado River, just east (upstream) of where the river enters Byers Canyon. U.S. Route 40 passes through the center of town as Byers Avenue; it leads 10 miles (16 km) east to Granby, the largest town in the county, and 17 miles (27 km) west to Kremmling.
According to the United States Census Bureau, the town has a total area of 0.77 square miles (2.0 km), all of it land.
As of the census of 2000, there were 521 people, 196 households, and 131 families residing in the town. The population density was 674.5 people per square mile (261.2/km²). There were 227 housing units at an average density of 293.9 per square mile (113.8/km²). The racial makeup of the town was 94.82% White, 0.38% African American, 1.92% Native American, 2.11% from other races, and 0.77% from two or more races. Hispanic or Latino of any race were 7.10% of the population.
There were 196 households out of which 32.1% had children under the age of 18 living with them, 57.7% were married couples living together, 5.1% had a female householder with no husband present, and 32.7% were non-families. 25.5% of all households were made up of individuals and 7.1% had someone living alone who was 65 years of age or older. The average household size was 2.45 and the average family size was 2.98.
In the town, the population was spread out with 24.4% under the age of 18, 9.0% from 18 to 24, 34.7% from 25 to 44, 25.7% from 45 to 64, and 6.1% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 122.6 males. For every 100 females age 18 and over, there were 134.5 males.
The median income for a household in the town was $39,306, and the median income for a family was $46,000. Males had a median income of $42,431 versus $20,208 for females. The per capita income for the town was $24,012. About 2.3% of families and 5.7% of the population were below the poverty line, including 4.0% of those under age 18 and 9.1% of those age 65 or over.