Williamstown is an unincorporated community in northern Lewis County, Missouri, United States. It is located at the intersection of Missouri Supplemental Routes A and E about twenty miles northwest of Canton. The community is part of the Quincy, IL–MO Micropolitan Statistical Area.
Williamstown was founded about 1856. It was named for its founder,Minus Williams.
- Eaton, David Wolfe (1916). How Missouri Counties, Towns and Streams Were Named. The State Historical Society of Missouri. p. 185.
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