| Round Barn, Cooper Township | |
| Coordinates: | 42.1293°N -95.7284°W |
| Area: | less than one acre |
| Built: | 1921 |
| Builder: | Seth Smith |
| Added: | June 30, 1986 |
| Refnum: | 86001463 |
The Round Barn, Cooper Township is a historic building located in Cooper Township southwest of Mapleton in rural Monona County, Iowa, United States. It was built in 1921 by Seth Smith. An auctioneer had this barn built to sell his purebred cattle.[1] The building is a true round barn that measures 38feet in diameter.[2] The barn features white vertical siding, a conical roof, and an aerator. It has been listed on the National Register of Historic Places since 1986.