High Quality Content by WIKIPEDIA articles! Fosters (sometimes given as Foster) is an unincorporated community in southern Warren County, Ohio, United States. It straddles the Little Miami River in Deerfield and Hamilton Townships. It is located about two miles southwest of Hopkinsville, two miles west of Maineville, and two miles northeast of Twenty Mile Stand just off State Routes 22/3, the 3C Highway. (In the 1930s, the State of Ohio erected a new high bridge over the river that bypassed the community.) The community is in the Kings Local School District and is served by the Maineville post office. The settlement was originally called Foster`s Crossing, and had its own post office. It is in the Little Miami telephone exchange. Governor Jeremiah Morrow once lived here.