A post office called Arnsberg was established in 1874, and remained in operation until 1917. The community is named after Arnsberg, in Germany. Arnsberg was originally built up chiefly by Germans.
- U.S. Geological Survey Geographic Names Information System: Arnsberg, Missouri
- "Post Offices". Jim Forte Postal History. Archived from the original on 6 March 2016. Retrieved 8 September 2016.
- Eaton, David Wolfe (1916). How Missouri Counties, Towns and Streams Were Named. The State Historical Society of Missouri. p. 270.
- "Cape Girardeau County Place Names, 1928–1945 (archived)". The State Historical Society of Missouri. Archived from the original on 24 June 2016. Retrieved 8 September 2016.
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