Fabius is a town in Onondaga County, New York, United States. The population was 1,964 at the 2010 census. The classical name of the town was assigned by a clerk interested in the classics.
According to the United States Census Bureau, the town has a total area of 46.8 square miles (121.2 km²), of which, 46.6 square miles (120.6 km²) of it is land and 0.2 square miles (0.6 km²) of it (0.51%) is water.
The south town line is the border of Cortland County and the east town line is the border of Madison County.
New York State Route 91 is a north-south highway, which intersects New York State Route 80, an east-west highway at Fabius village.
As of the census of 2000, there were 1,974 people, 686 households, and 515 families residing in the town. The population density was 42.4 people per square mile (16.4/km²). There were 779 housing units at an average density of 16.7 per square mile (6.5/km²). The racial makeup of the town was 97.77% White, 0.46% Black or African American, 0.66% Native American, 0.25% Asian, 0.10% Pacific Islander, 0.05% from other races, and 0.71% from two or more races. Hispanic or Latino of any race were 1.57% of the population.
There were 686 households out of which 40.7% had children under the age of 18 living with them, 65.2% were married couples living together, 7.7% had a female householder with no husband present, and 24.8% were non-families. 18.8% of all households were made up of individuals and 6.7% had someone living alone who was 65 years of age or older. The average household size was 2.87 and the average family size was 3.30.
In the town, the population was spread out with 29.9% under the age of 18, 6.8% from 18 to 24, 29.7% from 25 to 44, 25.2% from 45 to 64, and 8.3% who were 65 years of age or older. The median age was 37 years. For every 100 females, there were 97.6 males. For every 100 females age 18 and over, there were 99.6 males.
The median income for a household in the town was $52,663, and the median income for a family was $59,167. Males had a median income of $40,745 versus $28,036 for females. The per capita income for the town was $21,206. About 4.9% of families and 5.7% of the population were below the poverty line, including 7.7% of those under age 18 and 5.0% of those age 65 or over.