Walnut is a city in Pottawattamie County, Iowa, United States. The population was 747 at the time of the 2020 census. Walnut is locate…Walnut is a city in Pottawattamie County, Iowa, United States. The population was 747 at the time of the 2020 census. Walnut is located on Interstate 80 and is famous for its many antique stores. In recent years Walnut has become a regional center of wind turbine electrical generation.
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