Hillsdale Township (now a borough) was created on March 25, 1898.

The Borough Act resulted in a flurry of new boroughs created from portions of the township in 1894 as the ' Boroughitis' phenomenon swept through the Township of Washington, with Westwood (May 8, 1894), Park Ridge (May 14, 1894), Eastwood (part created June 6, 1894, borough lasted until 1896), Montvale (part created August 31, 1894) and Woodcliff (part created August 31, 1894, name changed to Woodcliff Lake in 1910) formed among the 26 boroughs created that year in the county. Orvil Township was created on January 1, 1886, from the western portion of The Township of Washington and the southern portion of Hohokus Township. Growth in the area exploded after the Civil War with the completion of the New Jersey and New York Railway through the Pascack Valley, as communities were established near the railroad's stations. Another municipality, Washington Borough, is completely surrounded by Washington Township, Warren County. It is one of five municipalities in the state of New Jersey with the name ' Washington Township'. The township was named for George Washington, one of more than ten communities statewide named for the first president. At the time of its creation, the township encompassed an area of 19,525 acres (79.01 km 2), more than 30 square miles (78 km 2). Washington Township was created by an act of the New Jersey Legislature on April 13, 1840, from the territories between the Hackensack River and Saddle River that had been part of Harrington Township. It is estimated that by 1750, 90% of the Lenape population in and around present-day New Jersey was killed by European settlement through war and European diseases. However, after Dutch and other European settlers began arriving in the 16th and 17th centuries, the Lenape population was decimated. Pascack and Kinderkamack are just two of these names.

The Lenape Native Americans first inhabited the township and many names throughout the general area were passed down from the Lenape. Seven Chimneys was used as a stop for the Underground Railroad. History Seven Chimneys, built 1745–1750, is the oldest house in Washington Township and third oldest in Bergen County. As of the 2020 United States census, the township's population was 9,285, an increase of 183 (+2.0%) of the 2010 census count of 9,102, reflecting an increase of 164 (+1.8%) from the 8,938 counted in the 2000 census. Washington Township (officially the Township of Washington) is a township in Bergen County, in the U.S.

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