Walnut Township was organized in 1867.

[1] Walnut Township covers an area of 35.88 square miles (92.9 km2) and contains no incorporated settlements.

According to the USGS, it contains three cemeteries: Fairview, Golden and Little Walnut.

The stream of Fourmile Creek runs through this township.

This article about a location in Butler County, Kansas is a stub.