Newark Valley is a town in Tioga County, New York, United States. The population was 3,946 at the 2010 census. The town is named after the city of Newark, New Jersey.
According to the United States Census Bureau, the town has a total area of 50.4 square miles (130.6 km²), of which, 50.3 square miles (130.4 km²) of it is land and 0.1 square miles (0.2 km²) of it (0.16%) is water.
The east town line is the border of Broome County.
New York State Route 38 and New York State Route 38B intersect south of Newark Valley village.
As of the census of 2000, there were 4,097 people, 1,488 households, and 1,123 families residing in the town. The population density was 81.4 people per square mile (31.4/km²). There were 1,615 housing units at an average density of 32.1 per square mile (12.4/km²). The racial makeup of the town was 98.19% White, 0.37% Black or African American, 0.20% Native American, 0.32% Asian, 0.24% from other races, and 0.68% from two or more races. Hispanic or Latino of any race were 0.66% of the population.
There were 1,488 households out of which 38.4% had children under the age of 18 living with them, 62.1% were married couples living together, 8.9% had a female householder with no husband present, and 24.5% were non-families. 19.8% of all households were made up of individuals and 8.6% had someone living alone who was 65 years of age or older. The average household size was 2.71 and the average family size was 3.11.
In the town, the population was spread out with 28.6% under the age of 18, 8.2% from 18 to 24, 29.2% from 25 to 44, 22.9% from 45 to 64, and 11.1% who were 65 years of age or older. The median age was 37 years. For every 100 females, there were 103.9 males. For every 100 females age 18 and over, there were 99.3 males.
The median income for a household in the town was $40,983, and the median income for a family was $45,321. Males had a median income of $32,305 versus $23,777 for females. The per capita income for the town was $17,577. About 4.7% of families and 7.3% of the population were below the poverty line, including 8.8% of those under age 18 and 3.3% of those age 65 or over.