First District (866,229)
Hamilton
Second District (1,040,908)
Champaign, Clark, Darke, Greene, Miami, Montgomery
Third District (756,980)
Allen, Auglaize, Crawford, Defiance, Hancock, Hardin, Henry, Logan, Marion, Mercer, Paulding, Putnam, Seneca, Shelby, Union, Van Wert, Wyandot
Forth District (587,699)
Adams, Athens, Gallia, Highland, Hocking, Jackson, Lawrence, Meigs, Pickaway, Pike, Ross, Scioto, Vinton, Washington
Fifth District (1,234,350)
Ashland, Coshocton, Delaware, Fairfield, Guernsey, Holmes, Knox, Licking, Morgan, Morrow, Muskingum, Perry, Richland, Stark, Tuscawaras
Sixth District (886,095)
Erie, Fulton, Huron, Lucas, Ottawa, Sandusky, Williams, Wood
Seventh District (593,893)
Belmont, Carroll, Columbiana, Harrison, Jefferson, Mahoning, Monroe, Noble
Eighth District (1,412,140)
Cuyahoga
Ninth District (1,009,937)
Lorain, Medina, Summit, Wayne
Tenth District (961,437)
Franklin
Eleventh District (766,847)
Ashtabula, Geauga, Lake, Portage, Trumbull
Twelfth District (730,603)
Brown, Butler, Clermont, Clinton, Fayette, Madison, Preble, Warren
