Washington Township is a township in Northampton County, Pennsylvania. Washington Township is located in the Lehigh Valley region of the state. It is part of Pennsylvania's Slate Belt.
The population of Washington Township was 4,152 at the 2000 census.
As of the census2 of 2000, there were 4,152 people, 1,601 households, and 1,179 families residing in the township. The population density was 88.8/km² (229.9/mi²). There were 1,670 housing units at an average density of 35.7/km² (92.5/mi²). The racial makeup of the township was 99.16% White, 0.05% African American, 0.07% Native American, 0.10% Asian, 0.31% from other races, and 0.31% from two or more races. Hispanic or Latino of any race were 0.67% of the population.
There were 1,601 households out of which 30.7% had children under the age of 18 living with them, 62.8% were married couples living together, 6.1% had a female householder with no husband present, and 26.3% were non-families. 22.2% of all households were made up of individuals and 13.6% had someone living alone who was 65 years of age or older. The average household size was 2.52 and the average family size was 2.96.
In the township the population was spread out with 22.4% under the age of 18, 5.5% from 18 to 24, 26.6% from 25 to 44, 26.3% from 45 to 64, and 19.2% who were 65 years of age or older. The median age was 42 years. For every 100 females there were 93.0 males. For every 100 females age 18 and over, there were 86.8 males.
The median income for a household in the township was $48,728, and the median income for a family was $54,601. Males had a median income of $37,213 versus $27,553 for females. The per capita income for the township was $22,219. About 3.3% of families and 5.8% of the population were below the poverty line, including 7.1% of those under age 18 and 7.5% of those age 65 or over.
The Township is served by the Bangor Area School District.