Sennett is a town in Cayuga County, New York, United States. The population was 3,595 at the 2010 census. The town is named after a public official and early settler, Daniel Sennett. The town is on the eastern county line of Cayuga County and borders Auburn.
According to the United States Census Bureau, the town has a total area of 28.8 square miles (74.7 km), of which 0.023 square miles (0.06 km), or 0.08%, is water.
The east town line is the border of Onondaga County. Sennett is in the Finger Lakes region, being near the north end of Owasco Lake and Skaneateles Lake.
U.S. Route 20 is an east-west highway, New York State Route 5 is a northeast-southwest highway, and New York State Route 34 is a north-south highway, all of which converge in the city of Auburn.
As of the census of 2000, there were 3,244 people, 1,085 households, and 864 families residing in the town. The population density was 112.6 people per square mile (43.5/km²). There were 1,117 housing units at an average density of 38.8 per square mile (15.0/km²). The racial makeup of the town was 96.02% White, 2.37% African American, 0.18% Native American, 0.86% Asian, 0.06% Pacific Islander, 0.03% from other races, and 0.46% from two or more races. Hispanic or Latino of any race were 0.65% of the population.
There were 1,085 households out of which 36.5% had children under the age of 18 living with them, 69% were married couples living together, 7.5% had a female householder with no husband present, and 20.3% were non-families. 16.8% of all households were made up of individuals and 10% had someone living alone who was 65 years of age or older. The average household size was 2.75 and the average family size was 3.1.
In the town, the population was spread out with 27.1% under the age of 18, 6.7% from 18 to 24, 25.8% from 25 to 44, 24.2% from 45 to 64, and 16.2% who were 65 years of age or older. The median age was 39 years. For every 100 females, there were 99.8 males. For every 100 females age 18 and over, there were 97 males.
The median income for a household in the town was $50,282, and the median income for a family was $57,009. Males had a median income of $37,663 versus $24,479 for females. The per capita income for the town was $19,593. 4.9% of the population and 3.7% of families were below the poverty line. 6% of those under the age of 18 and 4.7% of those 65 and older were living below the poverty line.