Franklin Township is one of twelve townships in Harrison County, Indiana, United States. As of the 2020 census, its population was 4,161 and it contained 1,728 housing units.

Historical population

Census	Pop.	Note	%±
1890	1,602		—
1900	1,599		−0.2%
1910	1,467		−8.3%
1920	1,458		−0.6%
1930	1,347		−7.6%
1940	1,309		−2.8%
1950	1,439		9.9%
1960	1,736		20.6%
1970	1,952		12.4%
1980	2,872		47.1%
1990	3,087		7.5%
2000	3,642		18.0%
2010	4,104		12.7%
2020	4,161		1.4%
Source: US Decennial Census

According to the 2010 census, the township has a total area of 34.91 square miles (90.4 km), of which 34.89 square miles (90.4 km) (or 99.94%) is land and 0.02 square miles (0.052 km) (or 0.06%) is water. The streams of Lazy Creek, Little Indian Creek, Smith Creek and Woertz Creek run through this township.

• Lanesville

• Breckenridge
• Utan

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

• Georgetown Township, Floyd County (northeast)
• Franklin Township, Floyd County (east)
• Posey Township (southeast)
• Webster Township (southwest)
• Harrison Township (west)
• Jackson Township (northwest)

The township contains one cemetery, Lanesville.

• Interstate 64
• Indiana State Road 62
• Indiana State Road 64

• Greenridge KLA Airport
• Lanesville Skyways Airport

• "Franklin Township, Harrison 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