South Dayton is a village in Cattaraugus County, New York, United States. The population was 620 at the 2010 census. The village lies within the town of Dayton by the southwest corner of the town and less than a mile from the border of Chautauqua County.
South Dayton is located at 42°21′46″N 79°3′6″W / 42.36278°N 79.05167°W / 42.36278; -79.05167 (42.362796, -79.051715). The western boundary of the village follows the Chautauqua County line.
According to the United States Census Bureau, the village has a total area of 1.0 square mile (2.6 km), all of it land.
County Road 2 (Main Street in the village) and NY-322 pass through the village. The New York and Lake Erie Railroad serves the village with freight and occasional passenger rail service.
Skunks Corners is a crossroads in the southwest part of the village.
As of the census of 2000, there were 662 people, 248 households, and 163 families residing in the village. The population density was 658.2 people per square mile (253.1/km²). There were 268 housing units at an average density of 266.5 per square mile (102.5/km²). The racial makeup of the village was 97.73% White, 0.30% African American, 0.30% Native American, 0.45% from other races, and 1.21% from two or more races. Hispanic or Latino of any race were 1.51% of the population.
There were 248 households out of which 35.5% had children under the age of 18 living with them, 44.0% were married couples living together, 16.1% had a female householder with no husband present, and 33.9% were non-families. 25.8% of all households were made up of individuals and 10.9% had someone living alone who was 65 years of age or older. The average household size was 2.67 and the average family size was 3.20.
In the village, the population was spread out with 33.7% under the age of 18, 7.1% from 18 to 24, 26.6% from 25 to 44, 21.0% from 45 to 64, and 11.6% who were 65 years of age or older. The median age was 33 years. For every 100 females, there were 87.0 males. For every 100 females age 18 and over, there were 88.4 males.
The median income for a household in the village was $29,375, and the median income for a family was $32,917. Males had a median income of $25,833 versus $22,404 for females. The per capita income for the village was $13,187. About 15.4% of families and 17.3% of the population were below the poverty line, including 20.0% of those under age 18 and 6.2% of those age 65 or over.