Underwood is a town in Pottawattamie County, Iowa, United States. The population was 954 at the time of the 2020 census. Underwood is loc…Underwood is a town in Pottawattamie County, Iowa, United States. The population was 954 at the time of the 2020 census. Underwood is located in Norwalk Township, so the early history of the township is also of the town. The historical information provided here was taken from a book on Pottawattamie County's past. The principal early settlers of the area arrived during the period from 1845 to 1850. In 1847, a flour mill and a saw mill were built on Mosquito Creek, southwest of the present site of Underwood. In 1850, the flour mill was destroyed by a flood. The first school was built in 1863, and soon more homes were built near the school and saw mill. It became known as Downsville. A post office was established there.
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