Most Populous U.S. Counties as a Percent of Their State

Name the counties that make up at least 15% of the population of their state.

Delaware has only 3 Counties, so it isn't included.

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Last updated: October 23, 2025

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1 Comments

Level 47

Oct 28, 2025

I gotta imagine that Oklahoma County could be included in this list, my estimation is that it's rougly 19% of the state population.