What are termed round barns include historic barns having true circular designs and also octagonal or other polygonal designs that approximate a circle. In the United States, in a first era of round barn construction, from 1850 to 1900, numerous octagonal barns were built. In a second era, from 1889 to 1936, numerous true circular barns were built.Auer, Michael J. The Preservation of Historic Barns , Preservation Briefs, National Park Service, first published October 1989. Retrieved 7 February 2007., (PDF), National Register of Historic Places Multiple Property Documentation Form, NRIS Database, National Register of Historic Places. Retrieved 8 February 2007.

This list article includes surviving or historic round barns in Canada, the United States, and elsewhere. There were 19 historic round and polygonal barns in Canada identified as surviving in the 1970s, in a list compiled by members of a club and typed up by Katherine Kirkam. According to Matthew Farfan, nine round barns survive in the Eastern Townships of the province of Quebec, all close to the U.S. border.This list confirms existence of 15 round or polygonal barns in Canada (8 of them in Quebec near the U.S. border) from Google and Bing satellite view, as of the satellite photos presented in Google and Bing in March 2016.

Besides paying attention to Canadian barns, Kirkham also studied American barns; in the 1970s, she identified 444 surviving barns in the United States. Many of them are listed on the National Register of Historic Places.

Dale J. Travis has identified and photographed (or collected photos of) round barns and other round or polygonal buildings throughout the United States and Canada. His webpages document the loss of numerous historic round barns.

The periods during which round barns were built varies across U.S. states. Most of Indiana's round barns were built between 1900 and 1920, and their construction peaked in 1910. Iowa's peak years were from 1909 to 1922. All 44 of the historic round barns built in South Dakota were built between 1903 and 1946. North Dakota's peak years were from 1910 to 1916. South Dakota had none built before 1900 because the state had yet to be developed.

Canada As documented here, there are at least 11 surviving octagonal, true round, and other round-type barns in Quebec. A few others survive in British Columbia, Alberta and Ontario. A list of round or near-round structures in Quebec, including historic round barns, developed by Dale J. Travis has informed this compilation.One barn in Quebec on Chemin Tetreault noted by Travis as possibly gone, is not now found on Google maps satellite view. Similar for other provinces at Travis site. Travis also includes less historic structures.

This includes others not in Travis's compilation, such as the Higginson Round Barn, which is an impressive and old one.

Following is incomplete, but is intended to become a complete list, from West to East:

Building ImageDatesfosgLocationCity, Province Description Fintry Estate barn 1925 Fintry Provincial Park and Protected Area, 7655 Fintry Delta Rd. Fintry, Okanagan Country, British Columbia Henderson Round Barn Built 1898, moved 1972 Fort Edmonton Park Edmonton, Alberta Preserved in a historical park.Henderson Round Barn at Dale Travis Sowerby Barn 1928 131 Brownlee Rd (at Round Barn Rd) Huron Shores, Ontario One of three 12-sided barns still existing in Canada Cordukes/Weber Barn 1919 1410 Basswood Lakes Road Algoma, Ontario 12-sided barn, site of farmers market, has been dismantled, moved and rebuilt adjacent to Sowerby Hall (formerly the Day and Bright Community and Recreation Centre) at 1410 Basswood Lake Road, near Hendry Street. Octagon barn south of Osgoode 5672 Dalmeny RoadOsgoode, Ontario Higginson Round Barn 1893–94 2500 Highway 34 Hawkesbury, Ontario Several sources, hidden. Walbridge Barn 1882 Chemin de Mystic Mystic, Quebec Oldest surviving polygonal barn in Canada. Also known as Grange Alexander-Solomon-Walbridge, it has a unique roof, became Quebec historic site in 2004 and became a museum in 2011 Round barn at West Brome Chemin Scott West Brome, Quebec Grange Ronde de Mansonville Rue Joseph Blanchet Mansonville, Quebec True round barn Round barn at Saint-Benoit-du-Lac Chemin Fisher Saint-Benoit-du-Lac, Quebec A round barn and a round hay tower Grange ronde Stanley-Holmes 1907 Chemin Holmes Barnston-Ouest Rbcq: "W. of Barnston. Hwy.141 W. from Barnston to Chemin Caron Rd., S. on Chemin Caron Rd. & SE on Chemin de Way's Mill & the barn would be on the right hand (S.) side of the road. Holmhurst Farm, true round barn, red horizontal siding, 2 pitch conical roof, louvered cupola." This is Stanley-Holmes Round Barn, on Holmhurst Farm. Round barn south of Barnston 1909 Chemin de Baldwin Mills Barnston South of Barnston, Coaticook, Quebec True round barn with two-pitch conical roof with a cupola, at Ferme Blayrond Round barn at Barnston 1901 Chemin Riendeau Barnston, Coaticook, Quebec In Barnston. True round barn with two-pitch conical roof, with cupola Grange Ronde built 1995 400 Rue St. Marc., Gorge de Coaticook Park Coaticook, Quebec Round barn west of Beaumont Pre-1850 Route du Fleuve (Route 132) Beaumont, Quebec White barn Adolph Gagnon Museum 1888 Saint-Fabien, Quebec Museum now in former barn Octagonal barn west of Cap Chatte Rue Notre Dame Ouest (2.5 miles west of Cap-Chat) Cap-Chat, Quebec Octagonal barn west of Cap Chatte Round barn near Dunham Dunham, Quebec Holmes' Barn c. 1907 Ways Mills, Quebec Second of two round barns near Ways Mills Ways Mills, Quebec

United States

West: California, Oregon, Washington, New Mexico, Colorado Building ImageDatesLocationCity, State Description Barn north of American Canyon S. Napa Junction Rd American Canyon, Napa Valley, California 20-sided, barnSan Luis Obispo Octagon Barn built pre-1900, restored 2009 Octagon Way, off Higuera St. San Luis Obispo, California Octagonal barn, by Knight Barn built 1894–96 2955(?) Copenhagen Road Loleta, California 16-sided barn, shown standing in photos by Mary Louise Lorensen. Shows collapsed in center in Google 2016 satellite imagery. Fountaingrove Round Barn Fountaingrove Parkway at Round Barn Blvd Fountaingrove, Santa Rosa, California 16-sided, destroyed during the Tubbs Fire of 2017. De Turk Round Barn built 1891NRHP 2004 819 Donahue St. Santa Rosa, California R. L. Johnston Round Barn (also called Beaver Creek Ranch Barn) 18-sided barn built in 1916; last remains dismantled 2007; rebuilt 2009Fort Crook AveFall River Mills, CaliforniaBuilt "...to break and train wild horses for the U. S. Army." Reconstructed on grounds of Fort Crook Museum. Mount Weske Stables Octagonal structure built in 1870s or 1880s.1520 Mount Weske Drive Windsor, California Houses racehorses. Pete French Round Barn Built c. 1875–1885 Burns, Oregon Cattle rancher Peter French (1849–1897) broke and trained horses there in winter. Lake County Round Sale Barn 1942 built2003 NRHP-listed 3531 S. 6th Street Lakeview, Oregon Laughlin Round Barn built 1883NRHP 1986 Castle Rock, Washington Coffman Barn built 1902 647 NW St. Helens Chehalis, Washington Located in the NRHP-listed Pennsylvania Avenue-West Side Historic District, the three-story round barn is in diameter and tall. Constructed for use as a dairy barn, stable, and garage. The structure is the only round barn residing in an NRHP-listed district in Washington state. Ojo Caliente Hot Springs Round Barn 1924 built2003 NRHP-listed Ojo Caliente, New Mexico Only round barn in New Mexico and the only adobe round barn in the U.S. with DeLaney Barn built 1902; NRHP 1989 200 S. Chambers Rd. Aurora, ColoradoOnly surviving round barn in Colorado. Built in 1902 as a silo. Converted into a dairy barn by 1910. with T. A. Leonard Barn built 1917; NRHP 1986 S. side of Old Moscow Highway, near Pullman, Washington Whitman County, Washington Very tall. Considered endangered before “saved” in 1992. Cornell Farmstead barn NRHP 1987 Pleasant Rd. and Old Prosser Rd., in or near Grandview Yakima County, Washington

Central Illinois See Round Barns in Illinois Thematic Resources for a discussion of current and former round barns in the state.

Building ImageDatesLocationCity, State Description University of Illinois round barns 1907–1913 Urbana, Illinois Important leading examples. Wheeler-Magnus Round Barn c. 1910 Arlington Heights, Illinois Only round barn surviving in Cook County. Clarence Kleinkopf Round Barn built 1915 Colchester, Illinois One of 3 round barns in area built by carpenter Dick Carmack Robert Weber Round Barn 1917 Durand, Illinois Dennis Otte Round Barn 1930 Eleroy, Illinois Gerald Harbach Round Barn built c.1914NRHP 1984 Eleroy, Illinois A 55-foot (16.8-m) diameter barn upon a poured concrete foundation. Its wood sided exterior has been covered in asphalt since the building's construction. James Bruce Round Barn built 1914NRHP 1984 Freeport, Illinois Constructed by Jeremiah Shaffer and the Haas Brothers, who built at least 12 round barns in the area. Features a single hip roof design probably influenced by the Agricultural Experiment Stations at the University of Illinois and the University of Wisconsin–Madison. Ryan Round Barn built 1910NRHP 1974 Kewanee, Illinois Chris Jensen Round Barn Lena, Illinois Lewis Round Barn 1914 Mendon, Illinois Robert Buckles Barn Built 1917Added to the NRHP in 1983 Mount Pulaski, Illinois Vitrified tile exterior Charles Fehr Round Barn built 1912NRHP 1984 Orangeville, Illinois Interesting for its hipped roof Raymond Schultz Round Barn Pontiac, Illinois Ron George Round Barn NRHP 1982 Romeoville, Illinois $1,500 building that with a diameter of . Served nine horse stalls and may have served cows as well. Its wooden cupola is raised sixty feet above a concrete foundation. Virginia Tillery Round Barn 1912 Whitehall, Illinois

Indiana Building ImageDatesLocationCity, State Description The Barns at Nappanee Nappanee Operating as ‘’’Round Barn Theatre’’’. Ben Colter Polygonal Barn Adams County Cornish Griffin Round Barn Pleasant Lake, Indiana Crown Point Round Barn Crown Point, Indiana 1410 E 137th Ave, Crown Point Duvall Round Barn built: 1914. New Roof: 1972 Buffalo, Indiana John Haimbaugh Round Barn Built 1914, Rochester, Indiana George Hall Round Barn built 1912 Medora, Indiana Hileman Round Barn Silver Lake, Indiana Martin Hofherr Round Barn Built: 1904 (demolished) York, Indiana Jasper Hufty Farm Round Barn Delphi, Indiana Tom Jones Round Barn Built: 1907 Kewanna, Indiana Bert Leedy Round Barn Rochester, Indiana Frank Littleton Round Barn built 1903NRHP 1993 Mount Comfort, Indiana Thomas Ranck Round Barn b. c.1885–1910NRHP 1983 Brownsville, Indiana 70 feet diameter, 70 feet tall barn featuring two rows of clerestories; stands out as one of the most elaborately designed structures in eastern Indiana. Marion Ridgeway Polygonal Barn built 1878, restored 2001 LaPorte, Indiana Everett Rouch Round Barn Bremen, Indiana Round barn in Muncie Muncie, Indiana Identified as "The Round Barn" in Google maps. Verified as round barn by street view. Rebecca Rankin Round Barn Poling, Indiana Quivey Round Barn Built 1913–14 Argos, Indiana This is a 12 sided barn, red vertical siding, cupola, 3-pitch sectional roof. Frank Senour Round Barn Blackhawk, Indiana Strauther Pleak Round Barn Greensburg, Indiana Don Smiley Round Barn Built 1914 Rochester, Indiana Utter-Gerig Round Barn Akron, Indiana Andrew B. VanHuys Round Barn Lebanon, Indiana Menno Yoder Round Barn Built in 1908 Lodi, Indiana W. H. York Round Barn Lodi, Indiana Weller-Calloway Round Barn Built 1914, Rochester, IndianaWatson Round Barn, orOliver Perry Watson Round Barn1907–08Mt. Etna, IN Wideman-Gerig Round Barn– Round Barn Golf Club RochesterE. O. White/ Hazelwood Round Barn1916Dana, Vermillion County, IndianaThe center silo is seventy-two feet tall and the barn is sixty foot in diameter.

Iowa