A round barn is a historic barn design that could be octagonal, polygonal, or circular in plan. Though round barns were not as popular as some other barn designs, their unique shape makes them noticeable. The years from 1880–1920 represent the height of round barn construction. Round barn construction in the United States can be divided into two overlapping eras. The first, the octagonal era, spanned from 1850–1900. The second, the true circular era, spanned from 1889–1936. The overlap meant that round barns of both types, polygonal and circular, were built during the latter part of the nineteenth century. Numerous round barns in the United States are listed on the National Register of Historic Places.
The Thomas Ranck Round Barn is a round barn in Waterloo Township near the Fayette-Wayne County, Indiana county line. It is one of many round barns built in Indiana during the late 19th and early 20th centuries. Of the round barns built in eastern Indiana during this period the Ranck Round Barn stands out as one of the most elaborately designed structures. The Thomas Ranck Round Barn was listed on the U.S. National Register of Historic Places in January 1983.
The W. H. York Round Barn, also known as Thompson Barn, is a historic round barn located on Country Road 249 (CR-249) a half mile south of Lodi, in Liberty Township, Parke County, Indiana. It was built about 1895, and is a two-level wood-frame structure on a brick foundation. The barn measures 56 feet in diameter. It has a conical roof topped by a circular cupola.
The Dennis Otte Round Barn is a round barn in the U.S. state of Illinois near the unincorporated Stephenson County community of Eleroy. The barn was built in 1930 by Herman Altenbern and has a diameter of 54 feet. The barn is representative of the last round barn design variations that evolved. The Otte Round Barn was added to the U.S. National Register of Historic Places in 1984.
Bronck Farm 13-Sided Barn is a historic barn located at Coxsackie in Greene County, New York. It was built about 1832 and is a 13 sided frame structure with a hipped roof surmounted by an octagonal cupola. It has an overall diameter of 70 feet and the one story interior is open in plan. It is related to, but listed separately from the Bronck House.
Blackhawk is an unincorporated community in Pierson Township, Vigo County, in the U.S. state of Indiana. The nearest official town is Riley. Blackhawk has one listing on the National Register of Historical Places in Vigo County, the Frank Senour Round Barn, built in 1905.
The Nebergall "Knoll Crest" Round Barn is located between Davenport and Blue Grass in rural Scott County, Iowa, United States. It was built in 1914, and has been listed on the National Register of Historic Places since 1986.
The Lenox Round Barn is a historic building that is part of the Taylor County Historical Museum in Bedford, Iowa, United States. The true round barn was built somewhere between 1905 and 1907. The building measures 64 feet (20 m) in diameter and 55 feet (17 m) in height. It features white vertical siding, a large cupola, and a two-pitch roof. The barn was thought to have been designed and built by J.E. Cameron on his farm 5 miles (8.0 km) south of Lenox.
Hamilton Round Barn is a historic round barn located near Mannington, Marion County, West Virginia. It was built in 1911, and is circular in shape, measuring 66 feet in diameter and 75 feet high at the center. It features a gambrel roof topped by a six-sided cupola. The barn has horizontal clapboard siding of poplar, painted white, and a slate roof. In 1985, it was one of only five round and polygonal barns standing in West Virginia. The barn was purchased by the West Augusta Historical Society in 1983, and is operated as a museum.
The Corson Emminger Round Barn near Watertown, South Dakota, United States, is a round barn that was built during 1909-1910 by Corson Emminger. It was listed on the National Register of Historic Places in 1978.
The Strauther Pleak Round Barn, also known as the "Pleak-Morgan Barn", is a round barn near Greensburg, Indiana, United States in Washington Township. Built in 1914, it was listed on the National Register of Historic Places in 1993. The barn is part of farmstead with a circa 1940 Indiana limestone ranch house, smoke house, spring house and garage. The main drive is looped enclosing a pen with a chicken coop and smaller barn.
The Frank Littleton Round Barn, also known as the "Littleton-Pulliam Round Barn", is a round barn near Mount Comfort, Indiana, United States. Built in 1903, it was listed on the National Register of Historic Places in 1993.
The Bert Leedy Round Barn, also known as Paxton Round Barn and as Fulton County Historical Society Round Barn, is a round barn located in Richland Township near Rochester, Indiana, United States. Built in 1924, it was listed on the National Register of Historic Places in 1993. The listing was consistent with terms of a National Park Service "Multiple Property Documentation" study on "Round and Polygonal Barns of Indiana" that was prepared in 1991. The Round Barn was moved to its current site, an open-air museum, in 1989 after it was struck by a tornado.
The John Haimbaugh Round Barn in Newcastle Township near Rochester, Indiana, United States, is a round barn that was built in 1914. It was listed on the National Register of Historic Places in 1993.
Ben Colter Polygonal Barn, also known as the Reinhart Barn, is a historic hexagonal barn located at St. Marys Township, Adams County, Indiana. It was built about 1907, and is a six-sided, two-story, frame barn with a cone roof and cupola. Attached to the barn is a drive-through shed.
Ramsay–Fox Round Barn and Farm is a historic round barn and farm in West Township, Marshall County, Indiana. The farmstead was established about 1900. The round barn was built about 1911 and is a true-circular barn, with a 60-foot (18 m) diameter. It has a two-pitch gambrel roof topped by a cupola and consists of a main level and basement. Also contributing are the farm site, farmhouse, milk house, windmill, and privy.
William Hill Polygonal Barn, also known as the Hill-Mershon Barn, is an eight-sided barn located at Bloomingdale, Parke County, Indiana. It was built about 1905, and is a two-story, octagonal frame building. It measures 30 feet in width and is topped by a sectional cone roof topped by an octagonal cupola.
George Rudicel Polygonal Barn is a historic 12-sided barn located in Noble Township, Shelby County, Indiana, USA. It was built in 1910 and is a two-story, vernacular frame barn. It is topped by a cone roof with a large dormer and square cupola.
S.C. Snider and George McFeeley Polygonal Barn, also known as the Shearer Barn, was a historic round barn located near Huntington in Huntington County, Indiana. It was built in 1906, and was a 12-sided, two-story frame barn. It had a sectional, three pitched gambrel roof topped by a cupola. It has been demolished.
United States 
