Cape Vincent is a town in Jefferson County, New York, United States. The population was 2,777 at the 2010 census.
According to the United States Census Bureau, the town has a total area of 89.8 square miles (232.7 km), of which 56.4 square miles (146.0 km) are land and 33.5 square miles (86.8 km), or 37.28%, are water. The northwest border of the town is the St. Lawrence River, and the western border is Lake Ontario. Much of the town is on a peninsula projecting into Lake Ontario, where the lake enters the river. The south part of the peninsula is in the neighboring town of Lyme. Facing the town across the St. Lawrence River is Wolfe Island, the largest of the Thousand Islands. The island is in Frontenac County, Ontario, Canada.
New York State Route 12E runs along the St. Lawrence River before it turns southeast at Cape Vincent village.
As of the census of 2000, there were 3,345 people, 867 households, and 601 families residing in the town. The population density was 59.2 people per square mile (22.9/km²). There were 2,783 housing units at an average density of 49.3 per square mile (19.0/km²). The racial makeup of the town was 70.64% White, 21.88% African American, 0.39% Native American, 0.36% Asian, 6.28% from other races, and 0.45% from two or more races. Hispanic or Latino of any race were 13.27% of the population.
There were 867 households out of which 25.7% had children under the age of 18 living with them, 56.6% were married couples living together, 8.1% had a female householder with no husband present, and 30.6% were non-families. 27.0% of all households were made up of individuals and 13.5% had someone living alone who was 65 years of age or older. The average household size was 2.36 and the average family size was 2.83.
In the town, the population was spread out with 13.2% under the age of 18, 8.7% from 18 to 24, 43.3% from 25 to 44, 22.4% from 45 to 64, and 12.4% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 216.8 males. For every 100 females age 18 and over, there were 251.8 males.
The median income for a household in the town was $37,330, and the median income for a family was $43,558. Males had a median income of $42,361 versus $22,308 for females. The per capita income for the town was $16,375. About 8.5% of families and 12.3% of the population were below the poverty line, including 20.0% of those under age 18 and 11.1% of those age 65 or over.