Ohio Counties by Population (2024)

The most populous counties in Ohio are Franklin County with 1,326,063, Cuyahoga County at 1,233,088, Hamilton County with 827,058, Summit County at 535,733, and Montgomery County with 533,796. You can get the most current Census population data for all 88 Ohio counties, sorted from the most populous counties in Ohio to the least, according to the 2023 Population Estimates Program.

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