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Population Review

What is the largest county in Ohio?

Franklin County is the largest county in Ohio with a population of 1,321,635, according to Census ACS 5-Year.

Context

Ohio has 88 counties.

Top 10

Franklin County1,321,635
Cuyahoga County1,249,418
Hamilton County827,878
Summit County538,087
Montgomery County535,528

Explore Further

Ohio full demographic profileCities in OhioAll US states

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Frequently Asked Questions

Franklin County is the largest county in Ohio with a population of 1,321,635, according to Census ACS 5-Year.