As of the 2020 census, its population was 731 (down from 785 at 2010[3]) and it contained 326 housing units.

Patoka, in White River Township, serves as the seat.

[5] The Trippett-Glaze-Duncan-Kolb Farm was listed on the National Register of Historic Places in 1993, with a boundary increase in 2009.

[3] Gibson County Knox County Pike County The township contains five cemeteries: Armstrong, Kirk, Kirk-McRoberts, Phillips and Richardson.

Washington Township is served by the North Gibson School Corporation although not having any schools of its own since the early 1970s.