Round Lake is a village in Saratoga County, New York, United States. The population was 604 at the 2000 census. The name is derived from a circular lake adjacent to the village. In 1975, the Round Lake Historic District, which encompasses the village, was added to the National Register of Historic Places.
Round Lake is located at 42°56′12″N 73°47′37″W / 42.93667°N 73.79361°W / 42.93667; -73.79361 (42.936784, -73.793661).
According to the United States Census Bureau, the village has a total area of 1.2 square miles (3.1 km), of which, 1.1 square miles (2.8 km) of it is land and 0.1 square miles (0.26 km) of it (7.69%) is water.
The village is located on the west side of a lake called Round Lake. Little Round Lake is a smaller lake northeast of Round Lake and connected by a short stream. New York State Route 67 passes the northeast side of the lake.
U.S. Route 9 passes through the east side of the village and Interstate 87, the Adirondack Northway is a half mile to the west. County Roads 80 and 823, passing through the village, link US-9 to the Northway.
As of the census of 2000, there were 604 people, 257 households, and 160 families residing in the village. The population density was 558.7 people per square mile (215.9/km²). There were 280 housing units at an average density of 259.0 per square mile (100.1/km²). The racial makeup of the village was 96.19% White, 0.50% African American, 0.83% Native American, 1.16% Asian, and 1.32% from two or more races. Hispanic or Latino of any race were 0.99% of the population.
There were 257 households out of which 32.3% had children under the age of 18 living with them, 47.5% were married couples living together, 12.5% had a female householder with no husband present, and 37.7% were non-families. 30.4% of all households were made up of individuals and 10.1% had someone living alone who was 65 years of age or older. The average household size was 2.35 and the average family size was 2.96.
In the village, the population was spread out with 25.3% under the age of 18, 6.0% from 18 to 24, 31.0% from 25 to 44, 26.5% from 45 to 64, and 11.3% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 88.8 males. For every 100 females age 18 and over, there were 84.1 males.
The median income for a household in the village was $43,409, and the median income for a family was $49,375. Males had a median income of $35,859 versus $30,750 for females. The per capita income for the village was $20,320. About 1.3% of families and 2.6% of the population were below the poverty line, including 1.1% of those under age 18 and 8.0% of those age 65 or over.