Richland Township is one of eleven townships in Benton County, Indiana. As of the 2020 census, its population was 562 and it contained 258 housing units. Its name is a "reference to the rich land within its borders."

Historical population

Census	Pop.	Note	%±
1890	1,124		—
1900	1,184		5.3%
1910	1,184		0.0%
1920	952		−19.6%
1930	1,031		8.3%
1940	961		−6.8%
1950	954		−0.7%
1960	1,016		6.5%
1970	867		−14.7%
1980	767		−11.5%
1990	679		−11.5%
2000	709		4.4%
2010	542		−23.6%
2020	562		3.7%
Source: US Decennial Census

According to the 2020 census, the township has a total area of 35.92 square miles (93.0 km), of which 35.89 square miles (93.0 km) (or 99.92%) is land and 0.03 square miles (0.078 km) (or 0.08%) is water.

• Earl Park

• Center (southeast)
• Parish Grove (southwest)
• Union (east)
• York (west)
• Grant Township, Newton County (northeast)
• Jefferson Township, Newton County (northwest)

• U.S. Route 41
• U.S. Route 52

The township contains three cemeteries: Dehner, Earl Park and Saint John.

• United States Census Bureau cartographic boundary files
• U.S. Board on Geographic Names

• Indiana Township Association
• United Township Association of Indiana