Buchanan is an unincorporated community in the southern part of Filmore Township in Bollinger County, Missouri, United States. The community lies approximately 18 miles southwest of Marble Hill and was named after James Buchanan, the fifteenth president of the United States, who served in office from 1857 to 1861.State Historical Society of Missouri: Bollinger County Place Names, 1928-1945 http://shs.umsystem.edu/manuscripts/ramsay/ramsay_bollinger.html A Directory of Towns, Villages, and Hamlets Past and Present of Bollinger County, Missouri A post office was established in 1857 and remained in operation until 1940.Post Offices in Bollinger County, MO
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