Watson, OhioWatson is an unincorporated community in Seneca [County, Ohio|Seneca County], in the U.S. state of Ohio.HistoryA former variant name was Watsons Station. A post office called Watsons Station was established in 1854, the name was changed to Watson in 1882, and the post office closed in 1923. Besides the post office, Watson had a railroad station, a general store, and grain elevator.