Erin, Jasper County, TexasErin is an unincorporated community in Jasper County, in the U.S. state of Texas.HistoryA post office was established at Erin in 1847, and remained in operation until 1923. The community was perhaps named for Erin, a poetic name for Ireland. Erin was formerly a station on the Atchison, Topeka and Santa Fe Railway.