| Octagon Barn, Richland Township | |
| Coordinates: | 41.8231°N -94.3373°W |
| Area: | less than one acre |
| Built: | 1881 |
| Added: | June 30, 1986 |
| Refnum: | 86001433 |
The Octagon Barn, Richland Township is a historic building located near Jamaica in Guthrie County, Iowa, United States. Built in 1881, this is the oldest known octagon-shaped barn extant in Iowa.[1] It measures 70feet in diameter. The modified hip roof, heavy timber construction, rectangular plan, and general purpose use mark this as a Coffin type. It was named for Lorenzo S. Coffin who is thought to have built the first round barn in the state.[1] This barn was listed on the National Register of Historic Places in 1986. The metal band Slipknot filmed the music video for Psychosocial here.[2]