Jefferson Township is one of six townships in Switzerland County, Indiana, United States. As of the 2020 census, its population was 3,203 and it contained 1,549 housing units.

Historical population

Census	Pop.	Note	%±
1890	3,491		—
1900	3,350		−4.0%
1910	2,713		−19.0%
1920	2,516		−7.3%
1930	2,401		−4.6%
1940	2,441		1.7%
1950	2,542		4.1%
1960	2,532		−0.4%
1970	2,365		−6.6%
1980	2,487		5.2%
1990	2,657		6.8%
2000	3,111		17.1%
2010	3,167		1.8%
2020	3,203		1.1%
Source: US Decennial Census

According to the 2010 census, the township has a total area of 37.2 square miles (96 km), of which 36.96 square miles (95.7 km) (or 99.35%) is land and 0.24 square miles (0.62 km) (or 0.65%) is water.

• Vevay

• Center Square at 38°50′11″N 85°01′53″W / 38.83645°N 85.03134°W / 38.83645; -85.03134
• Jacksonville at 38°49′44″N 85°02′56″W / 38.82895°N 85.04884°W / 38.82895; -85.04884
• Mount Sterling at 38°47′45″N 85°04′26″W / 38.795895°N 85.073840°W / 38.795895; -85.073840

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

• Cotton Township (northeast)
• York Township (east)
• Craig Township (southwest)
• Pleasant Township (northwest)

• Indiana State Road 56

• Ohio River

• Switzerland County School Corporation

• Indiana's 9th congressional district
• State House District 68
• State Senate District 45

• United States Census Bureau 2008 TIGER/Line Shapefiles
• United States Board on Geographic Names (GNIS)
• IndianaMap

• Indiana Township Association
• United Township Association of Indiana