The Langworthy House, also known as the Octagon House, is an historic building located in Dubuque, Iowa, United States. Built in 1856, it was designed by local architect John F. Rague for local politician Edward Langworthy. The two-story brick home features tall windows, a columned entry, and a windowed cupola. Langworthy and three of his brothers were among the first settlers in Dubuque. They were partners in a lead mine, helped to build the territorial road between Dubuque and Iowa City, they farmed, invested in real estate, and they owned a steamboat and a mercantile exchange. The house has been passed down through Langworthy's descendants. It was individually listed on the National Register of Historic Places in 1975, and it was included as a contributing property in the Langworthy Historic District in 2004.
The William Waterfield House, also known as the Waterfield Octagon House, is a historic building located in Raymond, Iowa, United States. Built in 1867, it was added to the National Register of Historic Places on October 19, 1978. Waterfield was a New Jersey native who settled in Iowa in 1856 as a farmer, eventually operating a hotel in Raymond, possibly in this house. He was a student of phrenology and as a result he built this octagon house. Its 2-foot (0.61 m) thick walls are covered with stucco, which hides its exterior of ashlar limestone. The house is capped with an unusual hipped roof that is formed by extending its east and west roof planes.
The Octagon Barn, Richland Township is an 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. It measures 70 feet (21 m) in diameter. The modified hip roof, heavy timber construction, rectangular plan, and general purpose use marks 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. This barn was listed on the National Register of Historic Places in 1986. The metal band Slipknot filmed the music video for Psychosocial here.
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 Secrest Octagon Barn is a historic building located near Downey in rural Johnson County, Iowa, United States. It was constructed in 1883 by master builder George Frank Longerbean for Joshua Hunt Secrest as a hay barn-horse stable. The octagonal barn measures 80 feet (24 m) in diameter. It features red vertical siding and a sectional bell shaped roof that is supported by hand-laminated beams. The octagon-shaped cupola has the same roof shape as the barn. It was listed on the National Register of Historic Places in 1974.
The Fobes Octagon Barn is a historic building located south of Lanesboro, Iowa, United States. It was built in 1883, and at the time of its nomination it was one of 14 octagon-shaped barns from the 19th-century left in Iowa. The barn has a diameter of 66 feet (20 m) and features a stone foundation, and a hip roof with a square cupola on top. The modification of the roof suggests this is a "Coffine type" structure similar to others built by Lorenzo Coffin. The general purpose barn has two granaries, horse stalls, and the rest of the space is open for agricultural machinery. It was listed on the National Register of Historic Places in 1986.
The C.A. Rownd Round Barn is a historic building located in Cedar Falls, Iowa, United States. It was built in 1911 by C.A. Rownd. It is constructed of ashlar-faced blocks that Rownd manufactured on the site. The barn was featured in the April 1912 edition of The Farm Cement News, which was published by Universal Portland Cement. The building is a true round barn that measures 83 feet (25 m) in diameter. 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 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 W.J. Buck Polygonal Barn was a historical structure located near Diagonal in rural Ringgold County, Iowa, United States. It was built in 1907 and has been listed on the National Register of Historic Places since 1986. The building measures 65 feet (20 m) around. The structure of the barn was basically a central octagon with a sectioned roof. Double pitch sheds surrounded the barn characterizing it as an encircling wing type. The central section was six-sided and the wing was nine-sided. The plan appears to be the same as the one for the Lloyd Z. Jones stock barn published in Wallaces' Farmer on January 16, 1903 and again on October 25, 1907 and June 17, 1910. It has subsequently been torn down.
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 Octagon Barn, Otter Township is a historic building located near Milo in rural Warren County, Iowa, United States. It was built in 1900 as a horse and dairy barn. The octagon-shaped building measures 54 feet (16 m) in diameter. The structure features a tall center section with a winged shed around it. It is covered in red horizontal siding and is topped by a sectional conical roof. It has been listed on the National Register of Historic Places since 1986.
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 Miller Round Barn was a historic building located near Sharon Center in rural Johnson County, Iowa, United States. It was constructed in 1918 by John Schrader. The bank barn that was built on a slope was an example of the Illinois Agricultural Experiment Station / H.E. Crouch type. The building was a true round barn that measured 60 feet (18 m) in diameter. It was covered in white vertical siding and features a two-pitch roof and a 10-foot (3.0 m) central silo. It was listed on the National Register of Historic Places since 1986. The barn has subsequently been torn down.
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.
The Round Barn, Pilot Grove Township is an historical building located in rural Montgomery County, Iowa, United States. It was built in 1912 as a general purpose barn. The building is a true round barn that measures 60 feet (18 m) in diameter. It is the type that was promoted by the Illinois Agricultural Experiment Station. The barn is covered in white vertical siding and features a two-pitch roof, a small dormer on the south side and an 18-foot (5.5 m) central silo. It has been listed on the National Register of Historic Places since 1986.
August Nus Polygonal Barn is a historic building located east of Arlington, Iowa, United States. Built in 1906, this was one of four flat roofed barns that were known to exist in Iowa, and it was the oldest of the four. The 12-sided structure with horizontal wood siding was built around a central silo that extends above the barn. Eventually, it had a cone shaped roof. The barn is 60-foot (18 m) in diameter, and the silo is 14 feet (4.3 m) in diameter. The barn was listed on the National Register of Historic Places in 1986.
