Brownville is a town in Jefferson County, New York, United States. The population was 6,263 at the 2010 census, up from 5,839 at the 2000 census. The town is named after Jacob Brown, an early settler and leader.
According to the United States Census Bureau, the town has a total area of 66.4 square miles (172.1 km), of which 59.1 square miles (153.1 km) are land and 7.3 square miles (19.0 km), or 11.02%, are water.
The west border of the town is Lake Ontario and Guffin Bay, an arm of the lake, and the south border is formed by the Black River, which flows into the lake at Black River Bay. The Perch River flows through the town from the northeast corner to the southern border and Lake Ontario at Black River Bay.
New York State Route 12E is an east-west highway, which intersects New York State Route 180, a north-south highway, at Limerick. New York State Route 12 crosses the northeast corner of the town.
As of the census of 2000, there were 5,843 people, 2,184 households, and 1,633 families residing in the town. The population density was 98.5 people per square mile (38.0/km²). There were 2,857 housing units at an average density of 48.2 per square mile (18.6/km²). The racial makeup of the town was 97.84% White, 0.27% Black or African American, 0.55% Native American, 0.27% Asian, 0.02% Pacific Islander, 0.27% from other races, and 0.77% from two or more races. Hispanic or Latino of any race were 0.58% of the population.
There were 2,184 households out of which 37.3% had children under the age of 18 living with them, 60.3% were married couples living together, 10.5% had a female householder with no husband present, and 25.2% were non-families. 20.5% 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 2.66 and the average family size was 3.07.
In the town, the population was spread out with 27.3% under the age of 18, 6.8% from 18 to 24, 29.2% from 25 to 44, 23.8% from 45 to 64, and 12.8% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 93.1 males. For every 100 females age 18 and over, there were 91.9 males.
The median income for a household in the town was $38,277, and the median income for a family was $43,866. Males had a median income of $33,889 versus $21,904 for females. The per capita income for the town was $16,303. About 6.0% of families and 8.2% of the population were below the poverty line, including 5.5% of those under age 18 and 11.3% of those age 65 or over.