Gomer is an unincorporated community in northern Sugar Creek Township, Allen County, Ohio, United States. Founded in 1833 by three Welshmen, Gomer was a hub of the Welsh community in America for decades. Although it is unincorporated, it has a post office, with the ZIP code of 45809. It lies at the intersection of Gomer Road with the Old Lincoln Highway less than one mile north of U.S. Route 30. The community is part of the Lima Metropolitan Statistical Area.