 A post office called Auxvasse has been in operation since 1874.Auxvasse has been claimed by at least 3 Callaway County townships since they were first delineated in 1821, when Auxvasse was located at the far northeast corner of the original boundaries of the then far-larger Cote Sans Dessein township for a period of only a few months.New townships (Fulton, Round Prairie, Nine Mile Prairie) were formed 1821–1838 in northern Callaway County, and a study of historical references should clarify which township Auxvasse was claimed by during that period.