As of the 2020 census, its population was 3,324 (down from 3,398 at 2010[3]) and it contained 1,398 housing units.

According to the 2010 census, the township has a total area of 49.04 square miles (127.0 km2), all land.

[3] The Eel River flows westward through the township.

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

Cleveland Township residents may obtain a free library card from the South Whitley Community Public Library.