Monmouth Township is located in the extreme southeastern corner of Shawnee County, Kansas, United States.
There are currently no incorporated cities in Monmouth Township.[ citation needed ] Berryton is the largest unincorporated community. At the beginning of the 21st century it contained a post office, Berryton Elementary School (part of USD 450), and two churches: Berryton United Methodist and Berryton Baptist.
Until the construction of Clinton Reservoir, the incorporated city of Richland was in the southeastern corner of the township. An attempt was made to relocate some of the business of Richland a mile and a half north to become Richland Corners, but when the site of the dam was moved downstream a few miles, Richland Corners was stranded too far from open water to benefit from the move. All the businesses eventually closed. Originally intended to be under a few feet of water, the townsite is now a true ghost town. One can drive a few of the streets and walk the cement slab floor of the elementary school. In addition to maintaining roads, the township authority tends to the cemeteries in the township.