Glenville is a town in Schenectady County, New York, United States. It was incorporated in 1821. As of the 2010 census, the town population was 29,480.
According to the United States Census Bureau, the town has a total area of 50.7 square miles (131.3 km), of which 49.2 square miles (127.4 km) is land and 1.5 square miles (3.9 km), or 2.94%, is water.
As of the census of 2000, there were 28,183 people, 11,150 households, and 7,827 families residing in the town. The population density was 565.0 people per square mile (218.2/km²). There were 11,582 housing units at an average density of 232.2 per square mile (89.7/km²). The racial makeup of the town was 97.35% White, 0.72% African American, 0.12% Native American, 0.89% Asian, 0.02% Pacific Islander, 0.14% from other races, and 0.75% from two or more races. Hispanic or Latino of any race were 1.20% of the population.
There were 11,150 households out of which 30.9% had children under the age of 18 living with them, 59.0% were married couples living together, 8.4% had a female householder with no husband present, and 29.8% were non-families. 26.0% of all households were made up of individuals and 12.5% had someone living alone who was 65 years of age or older. The average household size was 2.44 and the average family size was 2.95.
In the town, the population was spread out with 23.7% under the age of 18, 5.0% from 18 to 24, 26.3% from 25 to 44, 26.1% from 45 to 64, and 18.9% who were 65 years of age or older. The median age was 42 years. For every 100 females, there were 91.9 males. For every 100 females age 18 and over, there were 86.8 males.
The median income for a household in the town was $52,373, and the median income for a family was $62,599. Males had a median income of $42,992 versus $29,228 for females. The per capita income for the town was $24,795. 4.1% of the population and 2.5% of families were below the poverty line. Out of the total people living in poverty, 5.2% were under the age of 18 and 4.2% were 65 or older.