Sherman Township was created circa 1868.

[3] Sherman Township covers an area of 35.58 square miles (92.2 km2) and contains no incorporated settlements.

However, part of the Twin Lakes census-designated place is in the southern part of the township, surrounding North Twin Lake.

According to the USGS, it contains three cemeteries: Leith, Memorial Park and Swedish.

This article about the geography of Calhoun County, Iowa is a stub.