Franklin Township was organized in 1837, making it the oldest township in DeKalb County.

[5] According to the 2010 census, the township has a total area of 35.18 square miles (91.1 km2), of which 35.11 square miles (90.9 km2) (or 99.80%) is land and 0.07 square miles (0.18 km2) (or 0.20%) is water.

[4] Terry Lake is in this township.

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

The township contains one cemetery, Rude.