Antwerp is a town in Jefferson County, New York, United States. The population was 1,846 at the 2010 census. The town is named after Antwerp in Belgium, the home of one of the early investors in the town.
According to the United States Census Bureau, the town has a total area of 108.4 square miles (280.8 km), of which 106.0 square miles (274.6 km) are land and 2.4 square miles (6.2 km), or 2.19%, are water.
The northeast town line is the border of St. Lawrence County. The southeast town line is the border of Lewis County.
The Oswegatchie River flows through the north part of the town and loops back at Oxbow.
U.S. Route 11, a northeast to southwest highway, passes through the town.
The southeast portion of Antwerp contains part of the Fort Drum Military Reservation.
As of the 2000 United States Census, there were 1,793 people, 621 households, and 453 families in the town. The population density was 16.88/sqmi (6.52/km²). There were 717 housing units at an average density of 6.75/sqmi (2.61/km²). The racial makeup of the town was 97.99% White, 0.39% Black or African American, 0.06% Native American, 0.33% Asian, 0.39% from other races, and 0.84% from two or more races. Hispanic or Latino of any race were 1.56% of the population.
There were 621 households out of which 35.9% had children under the age of 18 living with them, 58.0% were married couples living together, 8.5% had a female householder with no husband present, and 26.9% were non-families. 20.8% of all households were made up of individuals and 9.5% had someone living alone who was 65 years of age or older. The average household size was 2.89 and the average family size was 3.32.
In the town, the population was spread out with 29.8% under the age of 18, 9.1% from 18 to 24, 27.3% from 25 to 44, 24.1% from 45 to 64, and 9.6% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 102.6 males. For every 100 females age 18 and over, there were 99.8 males.
The median income for a household in the town was $34,250, and the median income for a family was $40,192. Males had a median income of $28,824 versus $21,250 for females. The per capita income for the town was $13,097. About 12.3% of families and 17.6% of the population were below the poverty line, including 22.5% of those under age 18 and 10.6% of those age 65 or over.