As of the census of 2000, there were 1,377 people, 577 households, and 406 families residing in the town. The population density was . There were 1,557 housing units at an average density of . The racial makeup of the town was 98.69% White, 0.22% Native American, 0.58% from other races, and 0.51% from two or more races. Hispanic or Latino of any race were 0.65% of the population.
There were 577 households, out of which 23.2% had children under the age of 18 living with them, 59.3% were married couples living together, 6.2% had a female householder with no husband present, and 29.6% were non-families. 23.9% of all households were made up of individuals, and 9.2% had someone living alone who was 65 years of age or older. The average household size was 2.39 and the average family size was 2.76.
In the town, the population was spread out, with 20.3% under the age of 18, 6.7% from 18 to 24, 24.3% from 25 to 44, 29.8% from 45 to 64, and 19.0% who were 65 years of age or older. The median age was 44 years. For every 100 females, there were 100.4 males. For every 100 females age 18 and over, there were 103.3 males.
The median income for a household in the town was $37,019, and the median income for a family was $45,357. Males had a median income of $32,050 versus $24,792 for females. The per capita income for the town was $20,071. About 8.1% of families and 11.1% of the population were below the poverty line, including 8.7% of those under age 18 and 5.6% of those age 65 or over.
Communities and locations in Henderson
Communities and inhabited places
- Alexander Corners – A location southwest of Henderson village on NY-3.
- Aspinwall Corners – A location west of Henderson village on NY-3.
- Babbitt Corners – A location in the northeastern part of the town on County Road 71.
- Bishop Street – A location west of Butterville.
- Butterville – A hamlet by the eastern town line on County Road 75.
- Clark Point – A hamlet on the shore of Lake Ontario on Stony Point.
- Henderson – The hamlet of Henderson is on NY-178. It became an incorporated village in 1886, but subsequently dissolved the incorporation in 1992. The community is now a census-designated place.
- Henderson Harbor – A hamlet on the shore of Henderson Bay, The community was originally called "Naples" before 1820.
- Hungerford Corners – A hamlet west of Henderson village.
- Roberts Corners – A hamlet in the southeastern part of the town on NY-178 at County Road 75.
- Scotts Corners – A location near the southern town line on NY-178 at County Road 152.
Geographical features and locations
- Association Island – An island near the northern tip of Stony Point.
- Clark Point – A spit of land west of Sawyers Bay.
- Crystal Lake – A lake in the southeastern part of the town, also called "Sixtown Pond."
- Gravely Bay – A bay at the western tip of Stoney Point.
- Henderson Bay – An arm of Lake Ontario in the northwestern part of the town, partly defined by Stony Point and the mainland.
- Henderson Pond – A lake southwest of Henderson village.
- Hoveys Island – A location at the northern tip of Stony Point.
- Rays Bay – A bay at the southwestern tip of Stony Point.
- Robert G. Wehle State Park – A state park on Stony Point.
- Sawyers Bay – A bay located where Stony Point meets the mainland.
- Sawyer Point – A spit of land east of Sawyer Bay.
- Six Town Point – A location near the northern tip of Stony Point.
- Stony Creek – A stream flowing westward in the northern part of Henderson.
- Stony Point – A peninsula into Lake Ontario in the western part of the town.
- Westcott Beach State Park – A state park by the northern town line and Lake Ontario.