Jefferson Township is one of fifteen townships in Greene County, Indiana, USA. As of the 2020 census, its population was 1,959, down from 2,094 at 2010.

Historical population

Census	Pop.	Note	%±
1890	2,318		—
1900	2,562		10.5%
1910	2,677		4.5%
1920	2,588		−3.3%
1930	2,383		−7.9%
1940	2,315		−2.9%
1950	2,159		−6.7%
1960	2,146		−0.6%
1970	2,116		−1.4%
1980	2,041		−3.5%
1990	1,964		−3.8%
2000	2,036		3.7%
2010	2,094		2.8%
2020	1,959		−6.4%
Source: US Decennial Census

According to the 2010 census, the township has a total area of 32.55 square miles (84.3 km), of which 32.41 square miles (83.9 km) (or 99.57%) is land and 0.14 square miles (0.36 km) (or 0.43%) is water. The streams of Bunnell Branch, Corbin Creek, Eel River and Lemon Creek run through this township.

• Worthington

• Johnstown
• Point Commerce
• Rincon

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

• Jefferson Township, Owen County (north)
• Franklin Township, Owen County (northeast)
• Highland Township (east)
• Richland Township (southeast)
• Fairplay Township (south)
• Smith Township (west)

The township contains eight cemeteries: Barton, Bullerman, Dixon, Griffith, Hayes, Oak Grove, Stanley and Steward.

• US 231
• SR 48
• SR 157

Jefferson Township residents may obtain a library card from the Worthington-Jefferson Township Public Library in Worthington.

• "Jefferson Township, Greene County, Indiana". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved September 24, 2009.
• United States Census Bureau cartographic boundary files

• Indiana Township Association
• United Township Association of Indiana