Willsboro is a town in Essex County, New York, in the United States, and lies 30 miles (48 km) south of the city of Plattsburgh. As of the 2010 census, the town population was 2,025. The town is named after early landowner William Gilliland.
According to the United States Census Bureau, the town has a total area of 73.4 square miles (190.1 km), of which 42.7 square miles (110.7 km) is land and 30.7 square miles (79.4 km), or 41.78%, is water.
The east town line, marked by Lake Champlain, is the border of Vermont. The Boquet River enters Lake Champlain in the town east of Willsboro village.
New York State Route 22 is a north–south highway.
As of the census of 2000, there were 1,903 people, 803 households, and 549 families residing in the town. The population density was 44.6 people per square mile (17.2/km²). There were 1,468 housing units at an average density of 34.4 per square mile (13.3/km²). The racial makeup of the town was 98.42% White, 0.26% African American, 0.47% Native American, 0.26% from other races, and 0.58% from two or more races. Hispanic or Latino of any race were 0.47% of the population.
There were 803 households out of which 26.4% had children under the age of 18 living with them, 54.9% were married couples living together, 9.3% had a female householder with no husband present, and 31.6% were non-families. 24.5% of all households were made up of individuals and 14.3% had someone living alone who was 65 years of age or older. The average household size was 2.35 and the average family size was 2.77.
In the town, the population was spread out with 21.5% under the age of 18, 5.9% from 18 to 24, 26.5% from 25 to 44, 25.6% from 45 to 64, and 20.4% who were 65 years of age or older. The median age was 42 years. For every 100 females, there were 99.5 males. For every 100 females age 18 and over, there were 96.4 males.
The median income for a household in the town was $36,715, and the median income for a family was $40,272. Males had a median income of $30,244 versus $20,917 for females. The per capita income for the town was $20,209. About 3.8% of families and 9.5% of the population were below the poverty line, including 8.7% of those under age 18 and 6.7% of those age 65 or over.