The Kinney Octagon Barn was a historic agricultural building located just north of Burr Oak, Iowa, United States. Lorenzo Coffin was a stock breeder and the farm editor of the Fort Dodge Messenger. He is thought to have built the first round barn in Iowa in 1867. The modified hip roof and heavy timber construction of this barn, built in 1880, suggests that it was a Coffin-type octagon barn. It was added to the National Register of Historic Places on November 19, 1986. It has subsequently been torn down.
The Thomas Reburn Polygonal Barn is an historic building located near New Albin in rural Allamakee County, Iowa, United States. It was built in 1914 as a beef cattle barn. The building measures 46 feet (14 m) in diameter. It is a 12-sided structure that features red vertical siding and a silo that extends one story through the roof. It is one of four known barns in the round barn genre that was built with a flat or near flat roof in Iowa. It has been listed on the National Register of Historic Places since 1986.
The Round Barn, Washington Township is a historic building located south of Janesville, Iowa in Black Hawk County, United States. It was built in 1917 as a dairy barn. The building is a true round barn that measures 60 feet (18 m) in diameter. The structure is constructed in clay tile and features an aerator and a two-pitch roof. It was built around a silo with a water tank on top of it. While that is typical of this type of structure, it is the only one known to exist in Iowa. It has been listed on the National Register of Historic Places since 1986.
The Erza McKenzie Round Barn is a historic building located near Hazleton in rural Buchanan County, Iowa, United States. It was built in 1922 by Erza McKenzie for a dairy barn. The building is a true round barn that measures 70 feet (21 m) in diameter. The barn is constructed of clay tile and features small cupolas on the west, southwest and south sides of the structure. The building features a two-pitch roof and a central silo. It has been listed on the National Register of Historic Places since 1986.
The Grimes Octagon Barn is an historic building located near West Union in rural Fayette County, Iowa, United States. It was built by Joe Butler in 1880 for M.W. Grimes. The building is an octagon that measures 65 feet (20 m) in diameter. It is one of 14 known 19th-century octagon barns that still exist on an Iowa farm. The barn features red metal siding, a roof composed of wedge-shaped sections and a hay dormer. The sectional roof marks it as a Stewart type that was named for the New York farmer and agricultural editor Elliott W. Stewart, who designed the prototype in 1874. The barn has been listed on the National Register of Historic Places since 1986.
The Spotts Round Barn is a historic building located near Charles City in rural Floyd County, Iowa, United States. It was built in 1914 as a dairy and horse barn. Its design was influenced by the Iowa Agricultural Experiment Station. The building is a true round barn that measures 55 feet (17 m) in diameter. It is constructed of clay tile from the Johnston Brothers Clay Works. It features a two-pitch roof, a large hay dormer on the north side and a 12-foot (3.7 m) central silo. The barn has been listed on the National Register of Historic Places since 1986.
The Tonsfeldt Round Barn is a historic building located on the Plymouth County Fairgrounds in LeMars, Iowa, United States. It was built in 1918 to house H.P. Tonsfeldt's purebread Polled Hereford cattle, and prize bull, on his farm west of the city. The building is a true round barn that measures 82 by 68 feet. The barn features white horizontal siding, an aerator and a Gothic curved roof. The self-supporting Gothic-arch dome of this barn is a unique feature on Iowa's round barns. In 1981 the barn was moved from the farm to the fairgrounds in order to preserve it. It is now used for exhibit space. The barn has been listed on the National Register of Historic Places since 1986.
The Herman Wood Round Barn is a historic building located near Iowa Falls in rural Franklin County, Iowa, United States. It was built in 1916 by Herman Wood as a cattle barn. Matt King of the Permanent Buildings Society of Des Moines acted as the building consultant. The building is a true round barn that measures 122 feet (37 m) in diameter. The barn is constructed of clay tile and features a 20-foot (6.1 m) silo that extends through the flat roof. The rather large structure is one of the more unusual round barns in Iowa. The rolled-asphalt roof is suspended by wire cables that are hooked to rods at the top of the silo. King designed the system and wrote an article concerning the barn's construction in a 1917 issue of American Carpenter and Builder. The barn has been listed on the National Register of Historic Places since 1986.
The Holtkamp Round Barn is an historic building located near Salem in rural Henry County, Iowa, United States. It was built in 1918 by its first owner B.J. Holtkamp who used the plans drawn up by Matt L. King. The building is a true round barn that measures 50 feet (15 m) in diameter. It is constructed of clay tile from Mt. Pleasant Brick & Tile Mfg. Co. of Mt. Pleasant, Iowa and features an aerator, hay carrier, and a two-pitch roof. It has been listed on the National Register of Historic Places since 1986.
The Plagmann Round Barn is an historic building located near Conroy in rural Iowa County, Iowa, United States. It was built in 1912 as a cattle barn by Charles and Richard Plagmann. The building is a true round barn that measures 100 feet (30 m) in diameter. It is one of the largest Iowa Agriculture Experimental Station/Matt King type barns in the state. The barn is constructed of clay tile and features an aerator, a two-pitch roof and a 16-foot central silo. It has been listed on the National Register of Historic Places since 1986.
The Dyas Hexagonal Barn is an historical building located near Bellevue in rural Jackson County, Iowa, United States. Built in 1921, it features red horizontal siding, a tin roof and a central wood stave silo that extends through the roof. The building is hexagonal in shape and measures 50 feet (15 m) around. It is one of four known round barns that originally had a flat or near flat roof that was built on an Iowa farm. It has been listed on the National Register of Historic Places since 1986.
The Polygonal Barn, Van Buren Township was a historic building located in Van Buren Township in rural Jackson County, Iowa, United States. It was built in 1920 by Gus Klenney as a sale barn. They house livestock that are shown and sold to buyers. It is not known what livestock were sold here. The building was octagonal in shape and measured 50 feet (15 m) in diameter. It was listed on the National Register of Historic Places in 1986. The structure has subsequently been torn down.
The Polygonal Barn, Lincoln Township was an historic buildings located in Lincoln Township in rural Johnson County, Iowa, United States. It was built in 1880 by George Frank Longerbean. The barn was an 8-sided building and has subsequently been torn down. It featured a bell shaped roof of curving hand-laminated beams. The building was listed on the National Register of Historic Places in 1986.
The Round Barn, Washington Township is a historic building located near Sciola in rural Montgomery County, Iowa, United States. It was built in 1917 as a hog barn. Typical of a barn built for this use in features a multitude of windows on the wall and on the cupola, which provided light and ventilation. The building is a 24-sided structure that measures 60 feet (18 m) in diameter. The barn features red vertical siding, a 12-section cupola, and a two-pitch sectional roof. It has been listed on the National Register of Historic Places since 1986.
The Eckle Round Barn is a historic building that was located near Shelby in rural Pottawattamie County, Iowa, United States. The true round barn was built by Ed Brown and George Robinson in 1928 for Richard Eckle. It has a diameter of 54 feet (16 m). The barn featured white horizontal siding, a two-pitch sectional roof, aerator and a central clay tile silo with a 14-foot (4.3 m) diameter. The barn was listed on the National Register of Historic Places in 1986. It has subsequently been torn down.
The Round Barn, Buckingham Township is an historic building located north of Traer in Tama County, Iowa, United States. It was built in 1920 as a general purpose barn. The building is a true round barn that measures 50 feet (15 m) in diameter. The structure is constructed in clay tile from the Johnston Brothers' Clay Works and features an aerator and a segmented two-pitch roof. It has been listed on the National Register of Historic Places since 1986.
The John W. Young Round Barn is an historic building located near Traer in rural Tama County, Iowa, United States. It was built in 1917 by Joe Seda as a general purpose barn. The building is a true round barn that measures 65 feet (20 m) in diameter. The structure is constructed in clay tile and features a two-pitch roof and an 18-foot (5.5 m) central silo that is 45 feet (14 m) high. It has been listed on the National Register of Historic Places since 1986.
The Thomas Johnson Polygonal Barn was a historic building located near Wellman in rural Washington County, Iowa, United States. The 16-sided building measured 40 feet (12 m) in diameter. The structure was covered in red vertical siding and it was topped by a sectional conical roof, with windows on the south side and an aerator. The numerous windows and the 15 hog pens that were around its perimeter suggests that this was built as a hog barn as light and ventilation in hog barns were a concern in the early 20th-century. It was listed on the National Register of Historic Places in 1986. The barn has subsequently been torn down, and it was removed from the National Register in 2014.
The Octagon Round Barn, Indian Creek Township is an historic building located near Iowa Center in rural Story County, Iowa, United States. It was built in around 1880 as a dairy barn. The octagon-shaped building measures 50 feet (15 m) in diameter. The modified hip roof, heavy timber framing, rectangular interior plan, and general purpose use marks this as a design influenced by Lorenzo S. Coffin, who built the first round barn in Iowa. It has been listed on the National Register of Historic Places since 1986. The barn has deteriorated significantly and it is essentially a pile of wood now.
The Round Barn, Millville Township is an historical building located in rural Clayton County, Iowa, United States. It was built in 1916 as a general purpose barn. The building is a true round barn that measures 72 feet (22 m) in diameter. It is covered in metal vertical siding and features a dome roof, a cupola with an aerator and a central silo. It is one of three round barns in extant Iowa known to have a dome roof. The barn has been listed on the National Register of Historic Places since 1986.
