[27][28][29] Other unincorporated communities, localities and place names located partially or completely within the township include Bowerstown, Butlers Park, Changewater, Fort Golden, Imlaydale, and Pleasant Valley.

[35] The township's economic data (as is all of Warren County) is calculated by the US Census Bureau as part of the Lehigh Valley / Allentown-Bethlehem-Easton, PA-NJ Metropolitan Statistical Area.

[46][47] The 2010 United States census counted 6,651 people, 2,380 households, and 1,899 families in the township.

Of all households, 16.5% were made up of individuals and 7.1% had someone living alone who was 65 years of age or older.

[48] As of the 2000 United States census[15] there were 6,248 people, 2,099 households, and 1,740 families residing in the township.

14.1% of all households were made up of individuals, and 6.1% had someone living alone who was 65 years of age or older.

[3][51][52][53][54] In February 2016, the Township Committee unanimously selected George Willian from a list of three candidates nominated by the Republican municipal committee to fill the seat expiring in December 2018 that had been vacated by Nancy Andreson when she resigned for personal reasons shortly after taking office; Willan served on an interim basis until the November 2016 general election, when he was elected to serve the two years remaining on the term of office.

[55] In December 2013, the Township Council chose Theresa Iacobucci from among three candidates offered by the Republican municipal committee to fill the vacant seat of John A. Horensky following his resignation.

Iacobucci served on an interim basis until the November 2014 general election, when she was elected to serve the balance of the term through December 2015[56] Washington Township is located in the 7th Congressional District[57] and is part of New Jersey's 23rd state legislative district.

[58][59][60] For the 119th United States Congress, New Jersey's 7th congressional district is represented by Thomas Kean Jr. (R, Westfield).

[62] For the 2024-2025 session, the 23rd legislative district of the New Jersey Legislature is represented in the State Senate by Doug Steinhardt (R, Lopatcong Township) and in the General Assembly by John DiMaio (R, Hackettstown) and Erik Peterson (R, Franklin Township).

[67][68] Constitutional officers of Warren County are: Clerk Holly Mackey (R, Alpha; 2027),[69][70] Sheriff James McDonald Sr. (R, Phillipsburg; 2025)[71][72] and Surrogate Michael J. Doherty (R, Washington; 2025).

[76] Among the borough's 2010 Census population, 58.7% (vs. 62.3% in Warren County) were registered to vote, including 77.1% of those ages 18 and over (vs. 81.5% countywide).

[88][89] Public school students in seventh through twelfth grades attend the schools of the Warren Hills Regional School District, which also serves students from the municipalities of Franklin Township, Mansfield Township and Washington Borough, along with those from Oxford Township who attend for grades 9–12 only.

[90][91] Schools in the district (with 2018–19 enrollment data from the National Center for Education Statistics[92]) are Warren Hills Regional Middle School[93] located in Washington Borough with 542 students in grades 7–8 and Warren Hills Regional High School[94] located in Washington Township with 1,205 students in grades 9–12.