Grand Lake is a statutory town in Grand County, Colorado, United States. The population was 471 at the 2010 census.
Grand Lake is located in northeastern Grand County at 40°15′2″N 105°49′28″W / 40.25056°N 105.82444°W / 40.25056; -105.82444 (40.250493, -105.824323). U.S. Route 34 (Trail Ridge Road) runs through the western side of the town, entering Rocky Mountain National Park just north of town and leading 45 miles (72 km) across the mountains to Estes Park. To the southwest, US 34 leads 15 miles (24 km) to Granby.
According to the United States Census Bureau, the town has a total area of 1.0 square mile (2.7 km), all of it land.
As of the census of 2000, there were 447 people, 219 households, and 121 families residing in the town. The population density was 472.5 people per square mile (181.7/km²). There were 748 housing units at an average density of 790.7 per square mile (304.0/km²). The racial makeup of the town was 96.20% White, 0.67% African American, 0.89% Native American, 0.67% Asian, 0.22% from other races, and 1.34% from two or more races. Hispanic or Latino of any race were 2.68% of the population.
There were 219 households out of which 21.0% had children under the age of 18 living with them, 46.6% were married couples living together, 3.2% had a female householder with no husband present, and 44.7% were non-families. 35.2% of all households were made up of individuals and 5.5% had someone living alone who was 65 years of age or older. The average household size was 2.02 and the average family size was 2.60.
In the town, the population was spread out with 16.8% under the age of 18, 6.3% from 18 to 24, 29.3% from 25 to 44, 35.6% from 45 to 64, and 12.1% who were 65 years of age or older. The median age was 44 years. For every 100 females, there were 124.6 males. For every 100 females age 18 and over, there were 122.8 males.
The median income for a household in the town was $45,096, and the median income for a family was $55,750. Males had a median income of $30,833 versus $26,250 for females. The per capita income for the town was $34,676. About 3.0% of families and 7.0% of the population were below the poverty line, including 7.4% of those under age 18 and none of those age 65 or over.
Grand Lake Colorado neighborhoods include: Columbine Lake, Grand Lake Shadow Mtn, Grand Lake Village, Lyons Homestead, Mountain Meadows/Pine Beach