There were 842 more people living in Jefferson County in 2021 compared to 2020, according to population estimates from the US Census Bureau.
This is less than a one percent rise in Jefferson County’s population, from 226,929 in 2020 to 227,771 in 2021.
Jefferson County had the seventh largest population in Missouri in 2021.
The US Census Bureau found more than 73 percent of counties in the US saw a natural decrease in population in 2021. This is up from a 55.5 percent increase in 2020.
The Midwest suffered the most sustained population decreases, with many counties along the US East Coast and through the Rocky Mountains seeing increases.
The US population continues to grow, though at a slower rate than before.
Missouri Counties By Population Change from 2020 to 2021
| County | 2020 Estimated Population | 2021 Estimated Population | % Change in Population From Year to Year |
|---|---|---|---|
| Hickory County | 8,303 | 8,607 | 3.7% |
| Ozark County | 8,514 | 8,782 | 3.1% |
| Lincoln County | 59,829 | 61,586 | 2.9% |
| Benton County | 19,409 | 19,908 | 2.6% |
| Christian County | 89,224 | 91,499 | 2.5% |
| Wright County | 18,180 | 18,610 | 2.4% |
| Texas County | 24,413 | 24,987 | 2.4% |
| Warren County | 35,707 | 36,518 | 2.3% |
| Carter County | 5,207 | 5,320 | 2.2% |
| Cedar County | 14,199 | 14,496 | 2.1% |
| Knox County | 3,732 | 3,808 | 2% |
| Morgan County | 20,997 | 21,379 | 1.8% |
| Clark County | 6,632 | 6,736 | 1.6% |
| Camden County | 42,784 | 43,436 | 1.5% |
| Polk County | 31,577 | 32,043 | 1.5% |
| Webster County | 39,168 | 39,735 | 1.4% |
| Dallas County | 17,099 | 17,341 | 1.4% |
| Cass County | 108,113 | 109,638 | 1.4% |
| Platte County | 107,100 | 108,569 | 1.4% |
| Montgomery County | 11,262 | 11,415 | 1.4% |
| Livingston County | 14,562 | 14,755 | 1.3% |
| Newton County | 58,613 | 59,386 | 1.3% |
| Douglas County | 11,592 | 11,732 | 1.2% |
| Stone County | 31,175 | 31,548 | 1.2% |
| Henry County | 21,949 | 22,206 | 1.2% |
| Worth County | 1,962 | 1,983 | 1.1% |
| Boone County | 183,894 | 185,840 | 1.1% |
| Caldwell County | 8,806 | 8,897 | 1% |
| Osage County | 13,249 | 13,379 | 1% |
| St. Francois County | 66,900 | 67,541 | 1% |
| Holt County | 4,186 | 4,226 | 1% |
| Gentry County | 6,115 | 6,173 | 0.9% |
| Phelps County | 44,517 | 44,937 | 0.9% |
| Lawrence County | 37,963 | 38,321 | 0.9% |
| Shannon County | 7,041 | 7,106 | 0.9% |
| St. Charles County | 406,258 | 409,981 | 0.9% |
| Pike County | 17,613 | 17,761 | 0.8% |
| Callaway County | 44,288 | 44,638 | 0.8% |
| Putnam County | 4,676 | 4,712 | 0.8% |
| DeKalb County | 11,014 | 11,098 | 0.8% |
| Miller County | 24,733 | 24,909 | 0.7% |
| Taney County | 56,020 | 56,387 | 0.7% |
| Clay County | 253,923 | 255,518 | 0.6% |
| Ste. Genevieve County | 18,476 | 18,588 | 0.6% |
| Greene County | 299,060 | 300,865 | 0.6% |
| Howell County | 39,750 | 39,975 | 0.6% |
| Pettis County | 42,951 | 43,188 | 0.6% |
| Monroe County | 8,666 | 8,712 | 0.5% |
| Randolph County | 24,636 | 24,760 | 0.5% |
| Barry County | 34,539 | 34,712 | 0.5% |
| Schuyler County | 4,007 | 4,025 | 0.4% |
| Franklin County | 104,769 | 105,231 | 0.4% |
| McDonald County | 23,285 | 23,383 | 0.4% |
| Madison County | 12,600 | 12,652 | 0.4% |
| Cape Girardeau County | 81,788 | 82,113 | 0.4% |
| Clinton County | 21,204 | 21,287 | 0.4% |
| Barton County | 11,613 | 11,658 | 0.4% |
| St. Clair County | 9,340 | 9,376 | 0.4% |
| Bates County | 16,044 | 16,105 | 0.4% |
| Jefferson County | 226,929 | 227,771 | 0.4% |
| Jasper County | 122,766 | 123,155 | 0.3% |
| Gasconade County | 14,745 | 14,791 | 0.3% |
| Laclede County | 36,024 | 36,133 | 0.3% |
| Bollinger County | 10,525 | 10,556 | 0.3% |
| Johnson County | 54,002 | 54,150 | 0.3% |
| Howard County | 10,144 | 10,168 | 0.2% |
| Audrain County | 24,925 | 24,982 | 0.2% |
| Butler County | 42,007 | 42,101 | 0.2% |
| Dade County | 7,586 | 7,599 | 0.2% |
| Marion County | 28,470 | 28,518 | 0.2% |
| Oregon County | 8,617 | 8,631 | 0.2% |
| Cooper County | 17,089 | 17,115 | 0.2% |
| Reynolds County | 6,078 | 6,087 | 0.1% |
| Moniteau County | 15,464 | 15,484 | 0.1% |
| Harrison County | 8,155 | 8,164 | 0.1% |
| Dent County | 14,418 | 14,432 | 0.1% |
| Ralls County | 10,351 | 10,361 | 0.1% |
| Washington County | 23,499 | 23,502 | 0% |
| Wayne County | 10,913 | 10,914 | 0% |
| Cole County | 77,198 | 77,205 | 0% |
| Mississippi County | 12,537 | 12,538 | 0% |
| Macon County | 15,182 | 15,183 | 0% |
| Linn County | 11,849 | 11,843 | -0.1% |
| Jackson County | 717,243 | 716,862 | -0.1% |
| Grundy County | 9,729 | 9,720 | -0.1% |
| Scotland County | 4,698 | 4,693 | -0.1% |
| Saline County | 23,319 | 23,289 | -0.1% |
| Perry County | 18,960 | 18,922 | -0.2% |
| Vernon County | 19,642 | 19,595 | -0.2% |
| Adair County | 25,246 | 25,185 | -0.2% |
| Maries County | 8,427 | 8,406 | -0.2% |
| Nodaway County | 21,218 | 21,160 | -0.3% |
| Pulaski County | 53,964 | 53,816 | -0.3% |
| Lewis County | 10,031 | 10,000 | -0.3% |
| Chariton County | 7,380 | 7,356 | -0.3% |
| Daviess County | 8,427 | 8,399 | -0.3% |
| Ray County | 23,100 | 23,008 | -0.4% |
| Scott County | 38,009 | 37,840 | -0.4% |
| Andrew County | 18,083 | 18,002 | -0.4% |
| Lafayette County | 33,001 | 32,817 | -0.6% |
| St. Louis County | 1,002,838 | 997,187 | -0.6% |
| Ripley County | 10,680 | 10,617 | -0.6% |
| Stoddard County | 28,652 | 28,479 | -0.6% |
| Sullivan County | 5,976 | 5,934 | -0.7% |
| Mercer County | 3,515 | 3,488 | -0.8% |
| Buchanan County | 84,615 | 83,853 | -0.9% |
| Crawford County | 23,026 | 22,807 | -1% |
| Carroll County | 8,461 | 8,376 | -1% |
| Iron County | 9,515 | 9,408 | -1.1% |
| Atchison County | 5,306 | 5,234 | -1.4% |
| Dunklin County | 28,178 | 27,717 | -1.6% |
| New Madrid County | 16,329 | 16,035 | -1.8% |
| Shelby County | 6,101 | 5,976 | -2% |
| Pemiscot County | 15,585 | 15,236 | -2.2% |
| St. Louis city | 300,528 | 293,310 | -2.4% |
