Lisle is a town in Broome County, New York, United States. The population was 2,751 at the 2010 census.
According to the United States Census Bureau, the town has a total area of 47.0 square miles (121.7 km), of which 46.9 square miles (121.5 km) is land and 0.08 square miles (0.2 km), or 0.19%, is water.
The north town line is the border of Cortland County, and the west town line is the border of Tioga County.
The Tioughnioga River passes through the town, and Whitney Point Lake lies just east of the east town line. Interstate 81 and U.S. Route 11 pass north-south through the town. New York State Route 79 is an important east-west highway, and a small part of New York State Route 26 crosses the southeast corner of the town.
There is a naturally occurring artesian spring in Lisle.
As of the census of 2000, there were 2,707 people, 971 households, and 726 families residing in the town. The population density was 57.7 people per square mile (22.3/km²). There were 1,083 housing units at an average density of 23.1 per square mile (8.9/km²). The racial makeup of the town was 98.37% White, 0.44% Black or African American, 0.30% Native American, 0.04% Asian, 0.18% from other races, and 0.66% from two or more races. Hispanic or Latino of any race were 0.33% of the population.
There were 971 households out of which 37.8% had children under the age of 18 living with them, 58.7% were married couples living together, 10.1% had a female householder with no husband present, and 25.2% were non-families. 20.1% of all households were made up of individuals and 7.9% had someone living alone who was 65 years of age or older. The average household size was 2.79 and the average family size was 3.21.
In the town, the population was spread out with 29.6% under the age of 18, 8.7% from 18 to 24, 30.1% from 25 to 44, 21.1% from 45 to 64, and 10.5% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 101.1 males. For every 100 females age 18 and over, there were 100.0 males.
The median income for a household in the town was $34,240, and the median income for a family was $37,639. Males had a median income of $26,445 versus $22,455 for females. The per capita income for the town was $14,359. About 11.5% of families and 15.0% of the population were below the poverty line, including 24.5% of those under age 18 and 2.4% of those age 65 or over.