Cedar Valley, OhioCedar Valley is an unincorporated community in Wayne County, in the U.S. state of Ohio.HistoryA post office called Cedar Valley was established in 1841, the name was changed to Cedarvalley in 1895, and the post office closed in 1903. Cedar Valley was named for the valley of Cedar Run creek.Notable personDavid S. Stanley, a Union Army general during the American Civil War, was born at Cedar Valley in 1828.