Mannsville is a village in the town of Ellisburg in Jefferson County, New York, United States. The population was 354 at the 2010 census, down from 400 at the 2000 census. The name is from Barzillian Mann, early developer.
Mannsville is located near the southern border of Jefferson County at 43°42′41″N 76°3′51″W / 43.71139°N 76.06417°W / 43.71139; -76.06417 (43.711334, -76.064104), in the southeast part of the town of Ellisburg. According to the United States Census Bureau, the village has a total area of 0.93 square miles (2.4 km), of which 0.89 square miles (2.3 km) are land and 0.04 square miles (0.1 km), or 3.50%, are water. Skinner Creek by the village attracted early settlers to use its water power.
Mannsville is at the intersection of U.S. Route 11 and County Road 90. Interstate 81 passes less than a mile west of the village, with an interchange at CR 90. US-11 and I-81 lead north 21 miles (34 km) to Watertown, the county seat, and south 50 miles (80 km) to Syracuse.
As of the census of 2000, there were 400 people, 143 households, and 106 families residing in the village. The population density was 434.6 people per square mile (167.9/km²). There were 168 housing units at an average density of 182.5 per square mile (70.5/km²). The racial makeup of the village was 99.25% White, 0.25% Native American, 0.25% Asian, and 0.25% from two or more races. Hispanic or Latino of any race were 0.50% of the population.
There were 143 households out of which 42.7% had children under the age of 18 living with them, 54.5% were married couples living together, 15.4% had a female householder with no husband present, and 25.2% were non-families. 18.2% of all households were made up of individuals and 9.1% had someone living alone who was 65 years of age or older. The average household size was 2.71 and the average family size was 3.07.
In the village, the population was spread out with 28.8% under the age of 18, 7.3% from 18 to 24, 30.8% from 25 to 44, 18.0% from 45 to 64, and 15.3% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 89.6 males. For every 100 females age 18 and over, there were 85.1 males.
The median income for a household in the village was $47,574, and the median income for a family was $48,182. Males had a median income of $29,545 versus $20,625 for females. The per capita income for the village was $16,768. About 13.6% of families and 15.7% of the population were below the poverty line, including 24.0% of those under age 18 and 4.5% of those age 65 or over.