It is located within the Raritan Valley region and is one of six municipalities (five of which are townships) in the state with the name "Washington".

[9] In the 2013–2017 ACS, Washington Township had a median household income of $140,445, ranking 45th in the state.

[27] In June 1979, a 5-year-old boy was killed by a leopard that had been chained to a stake outside of a circus, during a performance sponsored by the local fire department at Flocktown Road School.

[28] A 1983 effort to rename Washington Township to Long Valley failed in an election.

Manfredonia, a gas station attendant who worked nearby, confessed to asking Domas out, when he was refused he pulled a knife and threatened to kill himself.

Police would find Domas's body buried in a shallow grave in the woods close to the road 2 days later.

Manfredonia would be turned in by his parents and was found by the police attempting to commit suicide by slicing his wrists and ingesting a high concentration of pills.

Manfredonia, who had an IQ of 78 making him clinically retarded, was suffering from Intermittent explosive disorder.

[1][2] Long Valley (2010 population of 1,879[32]) is an unincorporated community and census-designated place (CDP) located within Washington Township.

[37] Other unincorporated communities, localities and place names located partially or completely within the township include Bartley, Beattystown, Crestmoore, Drakestown, Fairmount, Four Bridges, German Valley, Lake George, Middle Valley, Naughright, Parker, Pleasant Grove, Pottersville, Scrappy Corner, Springtown and Stephensburg.

The natural springs in the area helped attract visitors to the Schooley's Mountain section in the 1800s.

Also in Somerset County in the extreme southeast corner of the town there is a border with Bedminster Township.

[3][58][59][60][61][62][63] In June 2022, the Township Committee appointed Michael Marino to fill the seat expiring in December 2022 that had been held by Tyler Oborn until he resigned from office as he was moving out of state.

[64] In September 2021, committeeman Greg Forsbrey, who was originally elected as a Republican in 2016, and subsequently re-elected in 2019, left the party and became an independent.

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

[72] For the 2024-2025 session, the 24th legislative district of the New Jersey Legislature is represented in the State Senate by Parker Space (R, Wantage Township) and in the General Assembly by Dawn Fantasia (R, Franklin) and Mike Inganamort (R, Chester Township).

[74] Actual day-to-day operation of departments is supervised by County Administrator Deena Leary.

[121] The high school district's board of education is comprised of nine members who are elected directly by voters to serve three-year terms of office on a staggered basis.

NJ Transit offered local bus service on the MCM5 route, which was terminated in 2010 as part of budget cuts.

[129] The Observer-Tribune is a weekly newspaper that serves Washington Township and a few surrounding communities in western Morris County.