| County | State | 2010 | 2017 estimate | 2018 estimate | Change 2010-2018 | 2010-2018 percent change | 2017-2018 change | 2017-2018 percent change |
|---|---|---|---|---|---|---|---|---|
| Bond | Ill. | 17,768 | 16,635 | 16,630 | -1,138 | -6.40% | -5 | -0.03% |
| Calhoun | Ill. | 5,089 | 4,841 | 4,802 | -287 | -5.64% | -39 | -0.81% |
| Clinton | Ill. | 37,762 | 37,607 | 37,639 | -123 | -0.33% | 32 | 0.09% |
| Franklin | Mo. | 101,492 | 103,288 | 103,670 | 2,178 | 2.15% | 382 | 0.37% |
| Jefferson | Mo. | 218,733 | 223,749 | 224,347 | 5,614 | 2.57% | 598 | 0.27% |
| Jersey | Ill. | 22,985 | 21,901 | 21,847 | -1,138 | -4.95% | -54 | -0.25% |
| Lincoln | Mo. | 52,566 | 56,134 | 57,686 | 5,120 | 9.74% | 1,552 | 2.76% |
| Macoupin | Ill. | 47,765 | 45,515 | 45,313 | -2,452 | -5.13% | -202 | -0.44% |
| Madison | Ill. | 269,282 | 265,471 | 264,461 | -4,821 | -1.79% | -1,010 | -0.38% |
| Monroe | Ill. | 32,957 | 34,159 | 34,335 | 1,378 | 4.18% | 176 | 0.52% |
| St. Charles | Mo. | 360,485 | 395,245 | 399,182 | 38,697 | 10.73% | 3,937 | 1.00% |
| St. Clair | Ill. | 270,056 | 262,426 | 261,059 | -8,997 | -3.33% | -1,367 | -0.52% |
| 50¶È»ÒÊÓƵ | Mo. | 998,954 | 996,648 | 996,945 | -2,009 | -0.20% | 297 | 0.03% |
| 50¶È»ÒÊÓƵ city | Mo. | 319,294 | 307,866 | 302,838 | -16,456 | -5.15% | -5,028 | -1.63% |
| Warren | Mo. | 32,513 | 34,365 | 34,711 | 2,198 | 6.76% | 346 | 1.01% |
| TOTAL | 2,787,701 | 2,805,850 | 2,805,465 | 17,764 | 0.63% | -385 | -0.01% |
The latest estimates from the U.S. Census Bureau show a continuation of a long-term trend, with St. Charles County gaining the most population and the city of 50¶È»ÒÊÓƵ losing the most. Population for the biggest county in the MSA, 50¶È»ÒÊÓƵ County, remained essentially unchanged in the most recent year.
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The metro area, ranked 20th in the U.S., showed no growth.
