Smithville is a town in Chenango County, New York, United States. The population was 1,330 at the 2010 census. The town is at the west border of Chenango County, west of the city of Norwich.
According to the United States Census Bureau, the town has a total area of 50.9 square miles (131.9 km), of which 50.5 square miles (130.7 km) is land and 0.46 square miles (1.2 km), or 0.94%, is water.
The west town line is the border of Broome County and Cortland County.
New York State Route 41 intersects New York State Route 220 north of Smithville Flats.
As of the census of 2000, there were 1,347 people, 492 households, and 364 families residing in the town. The population density was 26.7 people per square mile (10.3/km²). There were 672 housing units at an average density of 13.3 per square mile (5.1/km²). The racial makeup of the town was 97.62% White, 0.52% African American, 0.30% Native American, 0.30% Asian, 0.07% from other races, and 1.19% from two or more races. Hispanic or Latino of any race were 0.89% of the population.
There were 492 households out of which 35.0% had children under the age of 18 living with them, 59.6% were married couples living together, 9.6% had a female householder with no husband present, and 26.0% were non-families. 18.9% of all households were made up of individuals and 5.5% had someone living alone who was 65 years of age or older. The average household size was 2.72 and the average family size was 3.09.
In the town, the population was spread out with 27.0% under the age of 18, 7.0% from 18 to 24, 27.8% from 25 to 44, 28.0% from 45 to 64, and 10.2% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 111.5 males. For every 100 females age 18 and over, there were 105.6 males.
The median income for a household in the town was $35,972, and the median income for a family was $37,361. Males had a median income of $28,867 versus $24,063 for females. The per capita income for the town was $15,074. About 6.8% of families and 9.7% of the population were below the poverty line, including 9.7% of those under age 18 and 4.5% of those age 65 or over.