What is the largest county in Missouri?
St. Louis County is the largest county in Missouri with a population of 996,618, according to Census ACS 5-Year.
Context
Missouri has 115 counties.
Top 10
| St. Louis County | 996,618 |
| Jackson County | 717,021 |
| St. Charles County | 409,830 |
| Greene County | 301,121 |
| St. Louis city | 293,109 |
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Frequently Asked Questions
St. Louis County is the largest county in Missouri with a population of 996,618, according to Census ACS 5-Year.