Walnut Township is one of eighteen townships in Appanoose County, Iowa, United States.

[3] Walnut Township covers an area of 30.9 square miles (80.0 km2) and contains two incorporated settlements: Mystic and Rathbun.

According to the USGS, it contains six cemeteries: Bohm, Elgin, Forbush, Highland, Shaeffer and Zimmer.

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