Franklin County, Ohio, USA
County or equivalent
Location overview
Franklin County is a county in central Ohio whose county seat is Columbus, the state capital. The Ohio Department of Development’s 2025 county profile reports a 2024 population estimate of 1,356,303 and a land area of 540 square miles. Its municipalities include Columbus, Grove City, Dublin, Hilliard, Upper Arlington and Gahanna; some municipal boundaries cross county lines. The county and its constituent municipalities have distinct governments and service jurisdictions.