Great Falls. Octagon or hexagon building. Built in or before 1904. Not clear whether this is a house or a barn. Located on Twelfth Street near the intersection of Fourth Avenue, south. A segment of a 1891 map of Great Falls shows the building at the center of the image.
Source: R. Kline
Entered: August, 2001.

Bozeman.

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The Malmborg octagon schoolhouse. Built in 1905. Located at 375 Jackson Creek Road. Doric columns and a bell were orginally part of the structure. As of 2003 the school was still in operation.

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Source: Ellen Puerzer.
Entered: March, 2010.
Updated: March, 2013
Updated: July, 2013
Updated: February, 2016

East Helena. Octagon house. Part of the W. C. Child Ranch. Built in 1880. Located just north of East Helena on Highway 518, near the Prickly Pear Creek. Child went bankrupt in the Silver Panic of 1893, and died in October of that year. The ranch was owned and operated by a number of families for the next 50 years. In 1943 Paul Kleffner leased the ranch, which he then purchased three years later. The Kleffner's owned and operated the ranch until 2005, when it was sold to Denis and Stacy Young. The house and barn were listed on the National Register of Historic Places in 1977. As of year 2013 the house has been almost completely restored on the inside.

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Sources: R. Kline. Ellen Puerzer.
Entered: September, 2002.
Updated: June, 2009.
Updated: March, 2011
Updated: December, 2011
Updated: May, 2012
Updated: July, 2013
Updated: January, 2014

Hamilton. Octagon house. Built in 1909 by Othar C. Walmsley. Locted at 200 North 5th Street. On August 26, 1988, it was added to the National Register of Historic Places.

GPS coordinates: 46.248025 -114.161401

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1914

Sources: R. Kline. Ellen Pruezer. Courtesy of Montana State Preservation Office, John Boughton.
Entered: September, 2002.
Upated: May, 2009.
Updated: September, 2013
Updated: October, 2020
Updated: June, 2022