St. Louis, MO-IL Metro Area Demographics
St. Louis, MO-IL Metro Area is the 21st most populous of 935 metro areas in the United States, with 2,820,257 residents across 7,864 square miles. That is about 359 people per square mile.
At the 2020 census
| Population | 2,820,257 |
|---|---|
| Land area | 7,864 sq mi |
| Density | 359 / sq mi |
Data: 2020 Census · American Community Survey 2024
How St. Louis, MO-IL Metro Area compares to the US
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Central Location: St. Louis, MO-IL Metro Area
Measured from the metro area's main population center using 2020 census blocks.
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Counties in the St. Louis, MO-IL Metro Area area
| Name | Population | Sq mi | Per sq mi |
|---|---|---|---|
| County St. Louis | 1,004,111 | 507.8 | 1,977 |
| St. Charles County | 405,262 | 560.5 | 723 |
| city St. Louis | 301,578 | 61.9 | 4,871 |
| County Madison | 265,859 | 715.6 | 372 |
| St. Clair County | 257,400 | 657.7 | 391 |
| County Jefferson | 226,753 | 656.6 | 345 |
| Franklin County, MO | 104,682 | 922.6 | 113 |
| County Lincoln | 59,574 | 626.6 | 95 |
| County Macoupin | 44,967 | 862.9 | 52 |
| County Clinton | 36,903 | 474.1 | 78 |
| Warren County | 35,532 | 428.6 | 83 |
| Monroe County, IL | 34,962 | 385.3 | 91 |
| Jersey County | 21,512 | 369.6 | 58 |
| Bond County | 16,725 | 380.3 | 44 |
| Calhoun County, IL | 4,437 | 253.8 | 17 |
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About this page
This page shows demographics for a US metropolitan or micropolitan area from the 2020 census and the American Community Survey: population, land area, density, and how the area compares to national averages.
Metro areas are built from whole counties, listed below. Statistics aggregate the member counties' census tracts.