The 24th congressional district of Ohio was created for the 1966 election, after the banning of at-large seats by the Voting Rights Act of 1965. It replaced Ohio's at-large congressional district. It was eliminated in the redistricting following the 1970 census. At the time of its creation, it consisted of the southwestern counties of Preble, Butler, Warren and parts of southern and eastern Montgomery.
The following chart shows historic election results. Bold name indicates victor. Italic name indicates incumbent.