According to the United States Census Bureau, the township has a total area of, all of it land. Tunungwant Creek runs south-to-north in the township. The hamlets of Foster Brook and Derrick City are within Foster Township. The township is also adjacent to the city of Bradford.
Demographics
As of the census of 2010, there were 4,316 people, 1,829 households, and 1,305 families residing in the township. The population density was 98.4 people per square mile. There were 1,963 housing units at an average density of 41.9/sq mi. The racial makeup of the township was 98.51% White, 0.20% African American, 0.33% Native American, 0.48% Asian, 0.13% from other races, and 0.35% from two or more races. Hispanic or Latino of any race were 0.31% of the population. There were 1,829 households, out of which 31.9% had children under the age of 18 living with them, 59.5% were married couplesliving together, 8.0% had a female householder with no husband present, and 28.6% were non-families. 23.8% of all households were made up of individuals, and 12.7% had someone living alone who was 65 years of age or older. The average household size was 2.48 and the average family size was 2.94. The median home cost in Foster township is $82,300. In the township the population was spread out, with 24.7% under the age of 18, 6.1% from 18 to 24, 28.9% from 25 to 44, 23.1% from 45 to 64, and 17.2% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 96.0 males. For every 100 females age 18 and over, there were 92.8 males. The median income for a household in the township was $40,341, and the median income for a family was $45,652. Males had a median income of $31,573 versus $22,428 for females. The per capita income for the township was $17,809. About 6.9% of families and 10.4% of the population were below the poverty line, including 15.1% of those under age 18 and 8.8% of those age 65 or over. Compared to the rest of the country, Foster township's cost of living is 13.30% Lower than the U.S. average. The unemployment rate in Foster township is 8.80 percent.
