Missouri.

1. 01St. Louis County2025 population estimate 990,911
2. 02Jackson County2025 population estimate 732,994
3. 03St. Charles County2025 population estimate 426,499
4. 04Greene County2025 population estimate 309,286
5. 05St. Louis city2025 population estimate 278,144
6. 06Clay County2025 population estimate 265,032
7. 07Jefferson County2025 population estimate 233,132
8. 08Boone County2025 population estimate 191,746
9. 09Jasper County2025 population estimate 127,428
10. 10Cass County2025 population estimate 115,859

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