Valley City is an unincorporated community in northeast Johnson County, in the U.S. state of Missouri.[1] The community is on Missouri Route MM approximately seven miles north-northeast of Knob Noster.The community sits above a small tributary stream valley approximately one-half mile east of the Blackwater River.[2] A post office called Valley City was established in 1887, and remained in operation until 1903.This Johnson County, Missouri state location article is a stub.