The Town of Le Roy lies on the eastern edge of Genesee County. Within the town is a village, also called Le Roy.
Le Roy is the birthplace of Jell-O gelatin dessert. The Jell-O museum is also located in Le Roy.
Oatka Creek flows northward through the town and was a source of water power for early mills. The New York State Thruway (Interstate 90) passes across the north part of the town. The western terminus of Interstate 490 is also here.
The town rests atop the Onondaga Limestone Formation which forms an escarpment that faces north and runs east/west, just north of the village. The limestone rock is highly fossiliferous, of Devonian age, and extensively quarried. It is used for road building as crushed rock, and for the manufacture of portland cement. In the eastern part of the township is a community named Lime Rock.
There were 3,037 households out of which 31.9% had children under the age of 18 living with them, 52.3% were married couples living together, 9.8% had a female householder with no husband present, and 33.0% were non-families. 26.9% of all households were made up of individuals and 11.3% 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 3.04.
In the town the population was spread out with 25.2% under the age of 18, 6.9% from 18 to 24, 29.4% from 25 to 44, 23.5% from 45 to 64, and 15.1% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 93.0 males. For every 100 females age 18 and over, there were 89.9 males.
The median income for a household in the town was $39,690, and the median income for a family was $49,189. Males had a median income of $36,810 versus $23,024 for females. The per capita income for the town was $19,342. About 3.8% of families and 5.6% of the population were below the poverty line, including 5.0% of those under age 18 and 10.8% of those age 65 or over.