Martins Ferry, CaliforniaMartins Ferry is a former settlement in Klamath County and later in Humboldt County, California. It lay on the Klamath River, at an elevation of. It still appeared on maps in 1983.HistoryA post office operated at Martins Ferry from 1861 to 1862 and from 1865 to 1891. There was a military fort at the place in the 1860s. The name honors John F. Martin, its first postmaster, who also operated a ferry.