Oermann is an unincorporated community in western Jefferson County, in the U.S. state of Missouri.[1] The community is located on Missouri Route 30 approximately two miles northeast of Grubville and two miles southwest of Dittmer.[2]
A post office called Oermann was established in 1888, and remained in operation until 1955.[3] Charles Oermann, an early postmaster, gave the community his last name.[4]