National Register of Historic Places listings in Plymouth County, Iowa

This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Plymouth County, Iowa, United States. Latitude and longitude coordinates are provided for many National Register properties and districts; these locations may be seen together in a map.

There are 12 properties and districts listed on the National Register in the county. The Kimball Village archaeological site is the only National Historic Landmark in Plymouth County, Listed January 11, 2017.