Jefferson Township is one of twenty townships in Allen County, Indiana, United States. As of the 2010 census, its population was 2,109. Jefferson Township was organized in 1840.
The Craigville Depot, New York Chicago and St. Louis Railroad Steam Locomotive No. 765, and St. Louis, Besancon, Historic District are listed on the National Register of Historic Places.
According to the United States Census Bureau, Jefferson Township covers an area of ; of this, is land and , or 0.03 percent, is water.
(This list is based on USGS data and may include former settlements.)
Four Presidents Corners, a monument, was built in 1917 where Jefferson Township meets with Monroe, Madison, and Jackson townships. All four townships are named after presidents.
The township contains Emmanuel Cemetery.