Courtois is an unincorporated community in southwestern Washington County, Missouri, United States, within the Courtois Hills region. It is located approximately southwest of Belgrade and northeast of Viburnum, Missouri in Iron County.Courtois, Missouri, 7.5 Minute Topographic Quadrangle, USGS, 1999Farmington, Missouri, 30x60 Minute Topographic Quadrangle, USGS, 1987 Courtois is located on Missouri Route C and at the confluence of Indian Creek and Courtois Creek.Missouri Atlas & Gazetteer, DeLorme, 1998, First edition, p. 48

The community is named after an unidentified settler, as is a nearby stream, Courtois Creek. According to Ramsay, "The name of the creek is locally pronounced and sometimes written as Coataway or Cotoway." The name of the town is locally pronounced "Cur-toys".

A post office was established in 1886,Washington County Place Names, 1928-1945, Missouri Historical Society but is now closed and mail is now transported from Steelville or Belgrade.

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