Nelson is a town in Madison County, New York, United States. It is an interior town, located in the southwest part of the county. The population was 1,980 at the 2010 census. The town was named after Horatio Nelson, the English naval hero.
US Route 20 passes across the town.
According to the United States Census Bureau, the town has a total area of 44.0 square miles (114 km), of which, 43.1 square miles (112 km) of it is land and 0.9 square miles (2.3 km) of it (2.11%) is water.
As of the census of 2000, there were 1,964 people, 731 households, and 549 families residing in the town. The population density was 45.6 people per square mile (17.6/km²). There were 1,020 housing units at an average density of 23.7 per square mile (9.1/km²). The racial makeup of the town was 98.27% White, 0.20% African American, 0.10% Native American, 0.56% from other races, and 0.87% from two or more races. Hispanic or Latino of any race were 1.22% of the population.
There were 731 households out of which 38.7% had children under the age of 18 living with them, 64.6% were married couples living together, 6.2% had a female householder with no husband present, and 24.8% were non-families. 18.9% of all households were made up of individuals and 5.5% had someone living alone who was 65 years of age or older. The average household size was 2.69 and the average family size was 3.07.
In the town, the population was spread out with 28.3% under the age of 18, 5.6% from 18 to 24, 29.0% from 25 to 44, 27.5% from 45 to 64, and 9.6% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 103.7 males. For every 100 females age 18 and over, there were 103.6 males.
The median income for a household in the town was $49,022, and the median income for a family was $55,458. Males had a median income of $37,083 versus $24,653 for females. The per capita income for the town was $21,378. About 2.8% of families and 5.1% of the population were below the poverty line, including 4.9% of those under age 18 and 6.5% of those age 65 or over.