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Population Review

What is the largest county in Idaho?

Ada County is the largest county in Idaho with a population of 508,052, according to Census ACS 5-Year.

Context

Idaho has 44 counties.

Top 10

Ada County508,052
Canyon County242,405
Kootenai County177,736
Bonneville County127,056
Twin Falls County92,121

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Idaho full demographic profileCities in IdahoAll US states

Related Questions

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Frequently Asked Questions

Ada County is the largest county in Idaho with a population of 508,052, according to Census ACS 5-Year.