The alphamegalog of the cities of Ohio lists the largest city in Ohio for each letter of the alphabet. In this case, ‘largest’ is based on population within the city proper.

Akron
Beavercreek
Columbus
Dayton
Elyria
Fairfield
Grove City
Hamilton
Ironton
Jackson
Kettering
Lorraine
Mansfield
Newark
Oxford
Parma
Quincy
Reynoldsburg
Springfield
Toledo
Upper Arlington
Vandalia
Warren
Xenia
Youngstown
Zanesville