Greenford is an unincorporated community in central Green Township, Mahoning County, Ohio, United States. The community lies along State Route 165 a short distance north of Salem. It is part of the Youngstown-Warren-Boardman, OH-PA Metropolitan Statistical Area. Greenford has a post office with the ZIP code 44422, in operation since 1829. The community takes its name from Green Township. Greenford has a public library, a branch of the Public Library of Youngstown and Mahoning County.