Long Valley (2010 population of 1,879) is an unincorporated community and census-designated place (CDP) located within Washington Township. In the 2013-2017 ACS, Washington Township had a median household income of $140,445, ranking 45th in the state. Based on data from the American Community Survey (ACS) for 2014–2018, Washington Township residents had a median household income of $150,682, nearly 90% above the statewide median of $79,363. The township has been ranked as one of the state's highest-income communities. Additionally, Washington Borough is surrounded by another municipality that is also called Washington Township in Warren County.

Washington Borough, in fact is only 10 miles (16 km) away. It is located within the Raritan Valley region and is one of six municipalities (five of which are townships) in the state of New Jersey with the name 'Washington Township'. The township is situated in the westernmost part of Morris County bordering both Hunterdon and Warren counties. As of the 2010 United States Census, the township's population was 18,533, reflecting an increase of 941 (+5.3%) from the 17,592 counted in the 2000 Census, which had in turn increased by 2,000 (+12.8%) from the 15,592 counted in the 1990 Census. Washington Township is a township in Morris County, New Jersey, United States.

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