Cortlandville is a town in Cortland County, New York, United States of America. The population was 8,509 at the 2010 census.
According to the United States Census Bureau, Cortlandville has a total area of 49.9 square miles (129.2 km), of which 49.7 square miles (128.8 km) is land and 0.19 square miles (0.5 km), or 0.36%, is water.
The Tioughnioga River flows southward through the town and is part of the Susquehanna River watershed. The west town line is the border of Tompkins County.
Interstate 81, U.S. Route 11, and New York State Route 281 are north-south highways. New York State Route 41 and New York State Route 222 are east-west highways, but NY-41 turns northward from Cortland. New York State Route 13 is a northeast-southwest highway.
As of the census of 2000, there were 7,919 people, 3,166 households, and 2,168 families residing in the town. The population density was 159.0 people per square mile (61.4/km²). There were 3,431 housing units at an average density of 68.9 per square mile (26.6/km²). The racial makeup of the town was 96.93% White, 0.40% African American, 0.32% Native American, 0.71% Asian, 0.21% from other races, and 1.43% from two or more races. Hispanic or Latino of any race were 1.06% of the population.
There were 3,166 households out of which 29.5% had children under the age of 18 living with them, 55.0% were married couples living together, 9.8% had a female householder with no husband present, and 31.5% were non-families. 23.0% of all households were made up of individuals and 10.2% had someone living alone who was 65 years of age or older. The average household size was 2.49 and the average family size was 2.89.
In the town, the population was spread out with 23.2% under the age of 18, 9.7% from 18 to 24, 25.8% from 25 to 44, 26.3% from 45 to 64, and 15.0% who were 65 years of age or older. The median age was 39 years. For every 100 females, there were 92.3 males. For every 100 females age 18 and over, there were 89.2 males.
The median income for a household in the town was $37,458, and the median income for a family was $46,888. Males had a median income of $31,530 versus $23,984 for females. The per capita income for the town was $19,887. About 8.2% of families and 12.6% of the population were below the poverty line, including 11.3% of those under age 18 and 6.9% of those age 65 or over.
Cortlandville New York neighborhoods include: Cortland, Forbes Corl Health Camp, Highland, Page Green Rd, Tompkins-Starr, Walden Pond