Washington Township is a township in Clarion County, Pennsylvania, United States. The population was 1,869 at the 2020 census, a decrease from the figure of 1,887 tabulated in 2010.

Clarion County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 37,241. Its county seat is Clarion. The county was formed on March 11, 1839, from parts of Venango and Armstrong counties. Clarion County is entirely defined as part of the Pittsburgh media market. The county is part of the North Central Pennsylvania region of the state.