Louisville is a town in St. Lawrence County, New York, United States. The population was 3,145 at the 2010 census. The town is reportedly named after a French king, but it is pronounced as “Lewis-ville.”
According to the United States Census Bureau, the town has a total area of 63.8 square miles (165 km), of which, 48.2 square miles (125 km) of it is land and 15.7 square miles (41 km) of it (24.58%) is water.
The north town line, which is delineated by the Saint Lawrence River, is the international border with Canada, specifically the Province of Ontario. The Grasse River flows northeasterly through the town.
New York State Route 37 is an east-west highway in the northern part of the town. New York State Route 131 is a short highway near the St. Lawrence River. New York State Route 37B diverges northward from NY-37 near the east town line. New York State Route 56 crosses the eastern part of Louisville and intersect NY-37 by the east town line.
As of the census of 2000, there were 3,195 people, 1,279 households, and 892 families residing in the town. The population density was 66.3 people per square mile (25.6/km²). There were 1,437 housing units at an average density of 29.8 per square mile (11.5/km²). The racial makeup of the town was 96.84% White, 0.25% African American, 0.97% Native American, 1.25% Asian, 0.19% from other races, and 0.50% from two or more races. Hispanic or Latino of any race were 1.53% of the population.
There were 1,279 households out of which 31.0% had children under the age of 18 living with them, 59.9% were married couples living together, 6.2% had a female householder with no husband present, and 30.2% were non-families. 24.2% of all households were made up of individuals and 10.6% had someone living alone who was 65 years of age or older. The average household size was 2.50 and the average family size was 2.97.
In the town, the population was spread out with 24.9% under the age of 18, 5.8% from 18 to 24, 27.7% from 25 to 44, 27.5% from 45 to 64, and 14.0% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 102.0 males. For every 100 females age 18 and over, there were 98.3 males.
The median income for a household in the town was $39,125, and the median income for a family was $50,463. Males had a median income of $42,083 versus $25,855 for females. The per capita income for the town was $19,127. About 9.2% of families and 11.1% of the population were below the poverty line, including 14.1% of those under age 18 and 6.8% of those age 65 or over.