Washington Township is one of ten townships in Knox County, Indiana. As of the 2020 census, its population was 2,256 (slightly down from 2,286 at 2010) and it contained 1,040 housing units.

Historical population

Census	Pop.	Note	%±
1890	1,556		—
1900	1,480		−4.9%
1910	1,596		7.8%
1920	3,207		100.9%
1930	2,853		−11.0%
1940	2,691		−5.7%
1950	2,621		−2.6%
1960	2,267		−13.5%
1970	2,324		2.5%
1980	2,316		−0.3%
1990	2,387		3.1%
2000	2,320		−2.8%
2010	2,286		−1.5%
2020	2,256		−1.3%
Source: US Decennial Census

History

It is named for George Washington.

Enoco Coal Mine was added to the National Register of Historic Places in 2010.

Geography

According to the 2010 census, the township has a total area of 49.09 square miles (127.1 km), of which 48.84 square miles (126.5 km) (or 99.49%) is land and 0.24 square miles (0.62 km) (or 0.49%) is water.