Cortlandt is a town in Westchester County, New York located at the northwest edge of the county, at the eastern terminus of the Bear Mountain Bridge. The town includes the villages of Buchanan and Croton-on-Hudson.
The town’s western borders are the Hudson River and the city of Peekskill. Its northern borders are the towns of Philipstown and Putnam Valley in Putnam County. Its eastern border is the town of Yorktown. Its southern borders are the towns of New Castle and Ossining.
According to the United States Census Bureau, the town has a total area of 50.0 square miles (129.5 km), of which 39.3 square miles (101.7 km) is land and 10.8 square miles (27.9 km), or 21.51%, is water.
As of the census of 2000, there were 38,467 people, 13,517 households, and 10,137 families residing in the town. The population density was 969.7 people per square mile (374.4/km²). There were 14,065 housing units at an average density of 354.5 per square mile (136.9/km²). The racial makeup of the town was 88.60% White, 4.59% African American, 0.21% Native American, 2.57% Asian, 0.01% Pacific Islander, 2.35% from other races, and 1.68% from two or more races. Hispanic or Latino of any race were 7.19% of the population.
There were 13,517 households out of which 39.3% had children under the age of 18 living with them, 64.3% were married couples living together, 7.9% had a female householder with no husband present, and 25.0% were non-families. 21.3% of all households were made up of individuals and 8.8% had someone living alone who was 65 years of age or older. The average household size was 2.75 and the average family size was 3.22.
In the town, the population was spread out with 26.5% under the age of 18, 5.3% from 18 to 24, 30.1% from 25 to 44, 25.3% from 45 to 64, and 12.8% who were 65 years of age or older. The median age was 39 years. For every 100 females, there were 95.8 males. For every 100 females age 18 and over, there were 92.7 males.
The median income for a household in the town was $75,442, and the median income for a family was $89,053. Males had a median income of $59,949 versus $41,115 for females. The per capita income for the town was $33,432. About 2.9% of families and 4.5% of the population were below the poverty line, including 4.1% of those under age 18 and 5.1% of those age 65 or over.