Missouri Counties by Population (2024)

The most populous counties in Missouri are St. Louis County with 987,059, Jackson County at 718,560, St. Charles County with 416,659, Greene County at 304,611, and St. Louis city/county with 281,754. You can get the most current Census population data for all 115 Missouri counties, sorted from the most populous counties in Missouri to the least, according to the 2023 Population Estimates Program.

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