Southeast is a town in Putnam County, New York, United States. The population was 18,404 at the 2010 census. The town is in the southeast part of the county. Interstate 84, Interstate 684, U.S. Route 202, and US Route 6 pass through the town.
According to the United States Census Bureau, the town has a total area of 35.0 square miles (91 km), of which 32.1 square miles (83 km) is land and 2.9 square miles (7.5 km), or 8.35%, is water. The town contains several reservoirs that supply New York City.
The east town line borders Fairfield County, Connecticut and the south town line borders northern Westchester County.
As of the census of 2000, there were 17,316 people, 6,184 households, and 4,569 families residing in the town. The population density was 540.1 people per square mile (208.5/km²). There were 6,412 housing units at an average density of 200.0 per square mile (77.2/km²). The racial makeup of the town was 92.88% White, 1.87% African American, 0.14% Native American, 1.63% Asian, 0.09% Pacific Islander, 2.40% from other races, and 0.99% from two or more races. Hispanic or Latino of any race were 8.04% of the population.
There were 6,184 households out of which 37.5% had children under the age of 18 living with them, 61.9% were married couples living together, 8.7% had a female householder with no husband present, and 26.1% were non-families. 20.6% of all households were made up of individuals and 6.5% had someone living alone who was 65 years of age or older. The average household size was 2.77 and the average family size was 3.22.
In the town, the population was spread out with 26.4% under the age of 18, 5.9% from 18 to 24, 33.1% from 25 to 44, 24.6% from 45 to 64, and 10.0% who were 65 years of age or older. The median age was 37 years. For every 100 females, there were 101.6 males. For every 100 females age 18 and over, there were 97.2 males.
The median income for a household in the town was $69,272, and the median income for a family was $78,553. Males had a median income of $51,957 versus $39,583 for females. The per capita income for the town was $29,506. About 3.1% of families and 6.1% of the population were below the poverty line, including 8.3% of those under age 18 and 3.8% of those age 65 or over.
Southeast New York neighborhoods include: Asdasd, Brewster, Crosby Hill, Eagles Ridge, Farm to Market, Indian Hill, Main St, Milltown Road, Nelson, Old Route 22, Peaceable Hill, Putnam Lake, Reed Farm, Rodicoco, Starr Ridge Manor, Tonetta Lake