Ripley Township is one of twelve townships in Rush County, Indiana. As of the 2020 census, its population was 2,035 and it contained 891 housing units.

Historical population

Census	Pop.	Note	%±
1890	2,174		—
1900	2,118		−2.6%
1910	1,803		−14.9%
1920	1,815		0.7%
1930	1,783		−1.8%
1940	1,751		−1.8%
1950	1,831		4.6%
1960	1,876		2.5%
1970	1,998		6.5%
1980	1,988		−0.5%
1990	1,910		−3.9%
2000	2,111		10.5%
2010	2,156		2.1%
2020	2,035		−5.6%
Source: US Decennial Census

The County Line Bridge, Maurice W. Manche Farmstead, and Walnut Ridge Friends Meetinghouse are listed on the National Register of Historic Places.

According to the 2010 census, the township has a total area of 35.86 square miles (92.9 km), of which 35.68 square miles (92.4 km) (or 99.50%) is land and 0.18 square miles (0.47 km) (or 0.50%) is water.

• Carthage

• Boyd at 39°43′07″N 85°33′04″W / 39.7186563°N 85.5510851°W / 39.7186563; -85.5510851
• Charlottesville at 39°47′25″N 85°36′46″W / 39.7903221°N 85.6127533°W / 39.7903221; -85.6127533
• Farmers at 39°41′56″N 85°32′14″W / 39.6989344°N 85.5371958°W / 39.6989344; -85.5371958
• Henry at 39°47′09″N 85°35′15″W / 39.7858778°N 85.5874750°W / 39.7858778; -85.5874750

(This list is based on USGS data and may include former settlements.)

• Indiana Township Association
• United Township Association of Indiana