Arnica is an unincorporated community in Cedar County, in the U.S. state of Missouri.
[1] A post office called Arnica was established in 1883, and remained in operation until 1907.
[2] The community took its name from a nearby spring where arnica grew.
[3] In 1925, Arnica had 110 inhabitants.
This Cedar County, Missouri state location article is a stub.