(Links below lead to Quick Facts for Missouri Counties: People, Business & Geography at U.S. Census Bureau.)
| Area | 7/1/2008 | 7/1/2007 | 7/1/2006 | 7/1/2005 | 7/1/2004 | 7/1/2003 | 7/1/2002 | 7/1/2001 | 7/1/2000 | Census 2000 |
| Missouri | 5,911,605 | 5,878,399 | 5,832,977 | 5,785,130 | 5,742,650 | 5,704,639 | 5,675,641 | 5,641,994 | 5,605,868 | 5,595,211 |
|---|---|---|---|---|---|---|---|---|---|---|
| Adair County | 24,943 | 24,616 | 24,620 | 24,548 | 24,750 | 24,775 | 24,966 | 24,915 | 24,960 | 24,977 |
| Andrew County | 16,923 | 16,833 | 16,790 | 16,505 | 16,579 | 16,612 | 16,513 | 16,589 | 16,530 | 16,492 |
| Atchison County | 6,031 | 6,099 | 6,080 | 6,185 | 6,265 | 6,278 | 6,252 | 6,384 | 6,405 | 6,430 |
| Audrain County | 26,049 | 25,829 | 25,988 | 25,811 | 25,553 | 25,748 | 25,805 | 25,723 | 25,808 | 25,853 |
| Barry County | 36,301 | 36,103 | 35,894 | 35,349 | 34,959 | 34,651 | 34,216 | 34,072 | 34,042 | 34,010 |
| Barton County | 12,531 | 12,717 | 12,901 | 12,938 | 12,913 | 12,904 | 12,774 | 12,683 | 12,541 | 12,541 |
| Bates County | 17,075 | 17,002 | 17,008 | 16,945 | 16,955 | 17,006 | 16,951 | 16,774 | 16,702 | 16,653 |
| Benton County | 18,349 | 18,437 | 18,272 | 18,366 | 18,093 | 17,822 | 17,491 | 17,366 | 17,233 | 17,180 |
| Bollinger County | 11,990 | 12,114 | 12,112 | 12,151 | 12,178 | 12,213 | 12,249 | 12,240 | 12,053 | 12,029 |
| Boone County | 154,365 | 152,049 | 149,513 | 146,173 | 143,307 | 141,466 | 139,705 | 137,659 | 135,839 | 135,454 |
| Buchanan County | 89,408 | 89,013 | 87,472 | 87,097 | 86,634 | 86,304 | 86,324 | 86,177 | 86,094 | 85,998 |
| Butler County | 41,383 | 41,230 | 41,393 | 41,255 | 40,890 | 40,679 | 40,778 | 40,678 | 40,802 | 40,867 |
| Caldwell County | 9,248 | 9,273 | 9,216 | 9,160 | 9,141 | 9,083 | 9,000 | 8,987 | 8,977 | 8,969 |
| Callaway County | 43,464 | 43,180 | 42,919 | 42,503 | 41,578 | 41,931 | 41,969 | 41,491 | 40,925 | 40,766 |
| Camden County | 40,664 | 40,407 | 39,959 | 39,092 | 38,406 | 38,016 | 37,803 | 37,359 | 37,228 | 37,051 |
| Cape Girardeau County | 73,243 | 72,642 | 72,112 | 71,124 | 70,600 | 69,788 | 69,495 | 69,220 | 68,794 | 68,693 |
| Carroll County | 9,756 | 9,855 | 9,936 | 10,075 | 10,058 | 10,101 | 10,173 | 10,179 | 10,275 | 10,285 |
| Carter County | 5,890 | 5,913 | 5,885 | 5,879 | 5,876 | 5,910 | 5,880 | 5,870 | 5,945 | 5,941 |
| Cass County | 98,429 | 96,927 | 94,530 | 92,756 | 90,966 | 88,194 | 86,767 | 84,568 | 82,596 | 82,092 |
| Cedar County | 13,652 | 13,707 | 13,858 | 14,019 | 13,859 | 13,818 | 13,814 | 13,861 | 13,733 | 13,733 |
| Chariton County | 7,740 | 7,822 | 7,934 | 7,986 | 8,089 | 8,129 | 8,238 | 8,256 | 8,409 | 8,438 |
| Christian County | 75,479 | 72,954 | 69,688 | 66,409 | 63,522 | 60,921 | 58,863 | 56,930 | 54,952 | 54,285 |
| Clark County | 7,180 | 7,212 | 7,184 | 7,213 | 7,232 | 7,275 | 7,367 | 7,433 | 7,389 | 7,416 |
| Clay County | 215,707 | 211,525 | 206,592 | 200,959 | 196,995 | 193,625 | 191,190 | 188,205 | 184,806 | 184,006 |
| Clinton County | 21,094 | 20,975 | 20,485 | 20,540 | 20,529 | 20,118 | 19,584 | 19,396 | 19,031 | 18,979 |
| Cole County | 74,313 | 73,506 | 73,052 | 72,527 | 72,128 | 72,534 | 72,022 | 71,600 | 71,476 | 71,397 |
| Cooper County | 17,535 | 17,555 | 17,406 | 17,283 | 17,118 | 16,910 | 16,948 | 16,663 | 16,702 | 16,670 |
| Crawford County | 23,970 | 24,027 | 23,814 | 23,606 | 23,502 | 23,421 | 23,228 | 22,784 | 22,831 | 22,804 |
| Dade County | 7,418 | 7,495 | 7,574 | 7,602 | 7,647 | 7,707 | 7,774 | 7,853 | 7,907 | 7,923 |
| Dallas County | 16,844 | 16,815 | 16,449 | 16,204 | 16,168 | 15,938 | 15,832 | 15,734 | 15,690 | 15,661 |
| Daviess County | 7,911 | 7,957 | 8,055 | 8,043 | 8,078 | 8,012 | 7,969 | 7,936 | 7,995 | 8,016 |
| DeKalb County | 12,275 | 12,218 | 12,282 | 12,253 | 12,356 | 13,002 | 12,996 | 13,012 | 13,110 | 11,597 |
| Dent County | 15,199 | 15,029 | 15,112 | 14,991 | 14,949 | 14,889 | 14,833 | 15,031 | 14,934 | 14,927 |
| Douglas County | 13,438 | 13,348 | 13,356 | 13,338 | 13,268 | 13,164 | 13,229 | 13,052 | 13,099 | 13,084 |
| Dunklin County | 31,454 | 31,609 | 31,786 | 32,038 | 31,989 | 32,385 | 32,647 | 32,873 | 33,107 | 33,155 |
| Franklin County | 100,898 | 99,922 | 99,006 | 98,159 | 97,270 | 96,324 | 95,710 | 94,854 | 94,058 | 93,807 |
| Gasconade County | 15,261 | 15,366 | 15,408 | 15,475 | 15,434 | 15,436 | 15,395 | 15,389 | 15,370 | 15,342 |
| Gentry County | 6,185 | 6,226 | 6,308 | 6,400 | 6,462 | 6,487 | 6,617 | 6,778 | 6,850 | 6,861 |
| Greene County | 266,944 | 263,793 | 259,363 | 254,476 | 250,907 | 247,568 | 244,708 | 242,665 | 240,803 | 240,391 |
| Grundy County | 10,125 | 10,095 | 10,051 | 10,165 | 10,099 | 10,196 | 10,151 | 10,330 | 10,414 | 10,432 |
| Harrison County | 8,844 | 8,846 | 8,760 | 8,766 | 8,654 | 8,712 | 8,719 | 8,750 | 8,864 | 8,850 |
| Henry County | 22,179 | 22,347 | 22,384 | 22,278 | 22,386 | 22,370 | 22,152 | 22,287 | 22,089 | 21,997 |
| Hickory County | 9,048 | 9,108 | 9,111 | 9,101 | 9,024 | 8,955 | 8,793 | 8,970 | 8,942 | 8,940 |
| Holt County | 4,905 | 4,962 | 4,939 | 5,022 | 5,095 | 5,138 | 5,137 | 5,304 | 5,324 | 5,351 |
| Howard County | 9,918 | 9,867 | 9,902 | 9,907 | 9,870 | 9,947 | 10,003 | 10,121 | 10,180 | 10,212 |
| Howell County | 39,000 | 38,604 | 38,315 | 38,075 | 37,535 | 37,325 | 37,164 | 37,100 | 37,231 | 37,238 |
| Iron County | 9,918 | 10,002 | 10,147 | 10,203 | 10,280 | 10,256 | 10,444 | 10,537 | 10,632 | 10,697 |
| Jackson County | 668,417 | 666,000 | 663,603 | 661,857 | 661,507 | 661,156 | 660,580 | 658,104 | 655,720 | 654,880 |
| Jasper County | 116,813 | 115,049 | 112,918 | 110,936 | 109,482 | 108,121 | 107,023 | 105,822 | 105,004 | 104,686 |
| Jefferson County | 217,679 | 215,764 | 213,659 | 210,633 | 208,188 | 205,081 | 202,600 | 200,655 | 198,738 | 198,099 |
| Johnson County | 52,016 | 51,898 | 51,599 | 51,406 | 51,160 | 50,500 | 49,858 | 49,294 | 48,475 | 48,258 |
| Knox County | 4,020 | 4,045 | 4,063 | 4,110 | 4,172 | 4,205 | 4,249 | 4,279 | 4,355 | 4,361 |
| Laclede County | 35,524 | 35,346 | 34,887 | 34,212 | 33,499 | 33,138 | 32,862 | 32,886 | 32,589 | 32,513 |
| Lafayette County | 32,913 | 32,667 | 32,757 | 32,875 | 32,789 | 32,884 | 32,865 | 32,869 | 33,013 | 32,960 |
| Lawrence County | 37,757 | 37,629 | 37,135 | 36,813 | 36,335 | 36,086 | 36,006 | 35,544 | 35,324 | 35,204 |
| Lewis County | 9,951 | 10,031 | 10,079 | 10,057 | 10,146 | 10,222 | 10,325 | 10,379 | 10,501 | 10,494 |
| Lincoln County | 52,775 | 51,432 | 49,594 | 47,418 | 45,374 | 43,863 | 42,188 | 40,751 | 39,256 | 38,944 |
| Linn County | 12,580 | 12,684 | 12,785 | 12,986 | 13,187 | 13,312 | 13,464 | 13,603 | 13,722 | 13,754 |
| Livingston County | 14,213 | 14,181 | 14,105 | 14,112 | 14,191 | 14,262 | 14,341 | 14,472 | 14,497 | 14,558 |
| Macon County | 15,621 | 15,559 | 15,536 | 15,541 | 15,458 | 15,540 | 15,431 | 15,611 | 15,738 | 15,762 |
| Madison County | 12,276 | 12,170 | 12,024 | 11,982 | 11,909 | 11,797 | 11,839 | 11,811 | 11,801 | 11,800 |
| Maries County | 9,046 | 9,110 | 9,024 | 8,995 | 8,935 | 8,743 | 8,751 | 8,776 | 8,898 | 8,903 |
| Marion County | 28,225 | 28,157 | 28,217 | 28,126 | 28,058 | 28,182 | 28,023 | 28,105 | 28,309 | 28,289 |
| McDonald County | 22,731 | 22,803 | 22,798 | 22,554 | 22,290 | 22,014 | 21,667 | 21,667 | 21,664 | 21,681 |
| Mercer County | 3,523 | 3,496 | 3,496 | 3,514 | 3,566 | 3,616 | 3,635 | 3,720 | 3,756 | 3,757 |
| Miller County | 24,949 | 24,867 | 24,773 | 24,554 | 24,480 | 24,054 | 24,097 | 23,925 | 23,625 | 23,564 |
| Mississippi County | 13,504 | 13,589 | 13,729 | 13,653 | 13,606 | 13,509 | 13,172 | 13,232 | 13,362 | 13,427 |
| Moniteau County | 15,121 | 15,126 | 15,058 | 15,058 | 14,878 | 14,952 | 14,909 | 14,753 | 14,835 | 14,827 |
| Monroe County | 9,127 | 9,167 | 9,166 | 9,192 | 9,244 | 9,265 | 9,254 | 9,287 | 9,323 | 9,311 |
| Montgomery County | 11,804 | 11,888 | 11,906 | 12,017 | 12,022 | 11,931 | 11,978 | 12,062 | 12,131 | 12,136 |
| Morgan County | 20,861 | 20,794 | 20,590 | 20,351 | 20,197 | 19,922 | 19,690 | 19,637 | 19,367 | 19,309 |
| New Madrid County | 17,589 | 17,757 | 17,866 | 18,101 | 18,570 | 18,898 | 19,085 | 19,480 | 19,666 | 19,760 |
| Newton County | 56,120 | 55,994 | 55,418 | 54,939 | 54,318 | 53,764 | 53,055 | 52,774 | 52,706 | 52,636 |
| Nodaway County | 22,054 | 22,059 | 22,000 | 22,031 | 21,989 | 21,924 | 21,986 | 21,938 | 21,875 | 21,912 |
| Oregon County | 10,264 | 10,285 | 10,314 | 10,276 | 10,317 | 10,281 | 10,240 | 10,180 | 10,332 | 10,344 |
| Osage County | 13,465 | 13,358 | 13,456 | 13,319 | 13,223 | 13,225 | 13,039 | 13,057 | 13,081 | 13,062 |
| Ozark County | 9,227 | 9,217 | 9,338 | 9,349 | 9,388 | 9,456 | 9,417 | 9,409 | 9,529 | 9,542 |
| Pemiscot County | 18,515 | 18,740 | 18,855 | 19,057 | 19,204 | 19,475 | 19,754 | 19,824 | 20,015 | 20,047 |
| Perry County | 18,743 | 18,741 | 18,452 | 18,435 | 18,323 | 18,214 | 18,256 | 18,144 | 18,136 | 18,132 |
| Pettis County | 41,006 | 40,748 | 40,474 | 40,009 | 39,539 | 39,428 | 39,378 | 39,469 | 39,434 | 39,403 |
| Phelps County | 42,205 | 42,443 | 42,400 | 41,964 | 41,522 | 41,061 | 40,629 | 39,911 | 39,880 | 39,825 |
| Pike County | 18,476 | 18,430 | 18,597 | 18,620 | 18,311 | 18,383 | 18,299 | 18,261 | 18,311 | 18,351 |
| Platte County | 85,896 | 84,722 | 83,104 | 82,103 | 80,707 | 79,278 | 77,789 | 76,016 | 74,246 | 73,781 |
| Polk County | 30,404 | 30,162 | 29,643 | 29,042 | 28,499 | 28,219 | 27,782 | 27,432 | 27,065 | 26,992 |
| Pulaski County | 44,546 | 44,300 | 43,742 | 43,865 | 44,054 | 44,547 | 43,765 | 42,853 | 41,712 | 41,165 |
| Putnam County | 4,862 | 4,892 | 5,025 | 5,034 | 5,037 | 5,091 | 5,141 | 5,187 | 5,240 | 5,223 |
| Ralls County | 9,832 | 9,846 | 9,788 | 9,698 | 9,555 | 9,572 | 9,632 | 9,636 | 9,653 | 9,626 |
| Randolph County | 25,723 | 25,635 | 25,494 | 25,431 | 25,193 | 25,005 | 24,706 | 24,693 | 24,672 | 24,663 |
| Ray County | 23,445 | 23,446 | 23,624 | 23,467 | 23,629 | 23,613 | 23,481 | 23,392 | 23,374 | 23,354 |
| Reynolds County | 6,388 | 6,426 | 6,466 | 6,483 | 6,545 | 6,546 | 6,590 | 6,527 | 6,717 | 6,689 |
| Ripley County | 13,485 | 13,524 | 13,587 | 13,553 | 13,557 | 13,538 | 13,476 | 13,402 | 13,492 | 13,509 |
| Saline County | 22,505 | 22,614 | 22,695 | 22,847 | 22,934 | 22,859 | 22,957 | 23,403 | 23,746 | 23,756 |
| Schuyler County | 4,110 | 4,088 | 4,068 | 4,104 | 4,171 | 4,155 | 4,170 | 4,143 | 4,169 | 4,170 |
| Scotland County | 4,798 | 4,802 | 4,780 | 4,773 | 4,825 | 4,867 | 4,873 | 4,953 | 4,976 | 4,983 |
| Scott County | 40,673 | 40,705 | 40,605 | 40,633 | 40,443 | 40,404 | 40,277 | 40,418 | 40,390 | 40,422 |
| Shannon County | 8,423 | 8,404 | 8,297 | 8,252 | 8,214 | 8,181 | 8,258 | 8,298 | 8,319 | 8,324 |
| Shelby County | 6,411 | 6,492 | 6,533 | 6,650 | 6,638 | 6,649 | 6,714 | 6,780 | 6,788 | 6,799 |
| St. Charles County | 349,407 | 343,207 | 335,820 | 327,375 | 318,557 | 310,482 | 302,729 | 294,653 | 286,163 | 283,883 |
| St. Clair County | 9,270 | 9,396 | 9,372 | 9,461 | 9,487 | 9,486 | 9,569 | 9,587 | 9,671 | 9,652 |
| St. Francois County | 63,214 | 62,762 | 62,076 | 61,622 | 60,318 | 57,686 | 56,544 | 56,089 | 55,744 | 55,641 |
| St. Louis city | 354,361 | 355,663 | 353,837 | 352,572 | 350,705 | 348,039 | 350,471 | 349,955 | 346,864 | 348,189 |
| St. Louis County | 991,830 | 993,512 | 996,953 | 999,817 | 1,004,466 | 1,009,045 | 1,013,003 | 1,015,690 | 1,016,330 | 1,016,315 |
| Ste. Genevieve County | 17,720 | 17,822 | 17,882 | 17,887 | 17,931 | 17,926 | 17,869 | 17,899 | 17,908 | 17,842 |
| Stoddard County | 29,537 | 29,687 | 29,763 | 29,769 | 29,687 | 29,606 | 29,775 | 29,650 | 29,693 | 29,705 |
| Stone County | 31,551 | 31,491 | 31,150 | 30,474 | 30,320 | 29,916 | 29,328 | 28,904 | 28,740 | 28,658 |
| Sullivan County | 6,629 | 6,657 | 6,763 | 6,854 | 6,934 | 7,050 | 7,258 | 7,243 | 7,226 | 7,219 |
| Taney County | 47,023 | 45,677 | 44,154 | 43,072 | 42,138 | 41,490 | 40,903 | 40,231 | 39,939 | 39,703 |
| Texas County | 24,598 | 24,557 | 24,549 | 24,286 | 24,303 | 23,985 | 24,176 | 24,025 | 23,001 | 23,003 |
| Vernon County | 20,009 | 19,988 | 20,085 | 20,223 | 20,222 | 20,193 | 20,270 | 20,416 | 20,414 | 20,454 |
| Warren County | 31,214 | 30,414 | 29,470 | 28,585 | 27,578 | 26,869 | 26,076 | 25,324 | 24,720 | 24,525 |
| Washington County | 24,548 | 24,282 | 24,083 | 23,818 | 23,867 | 23,721 | 23,666 | 23,454 | 23,410 | 23,344 |
| Wayne County | 12,652 | 12,639 | 12,763 | 12,905 | 12,910 | 13,065 | 13,080 | 13,248 | 13,256 | 13,259 |
| Webster County | 36,473 | 35,883 | 34,980 | 34,279 | 33,619 | 32,852 | 32,456 | 31,962 | 31,261 | 31,045 |
| Worth County | 2,039 | 2,093 | 2,088 | 2,121 | 2,179 | 2,219 | 2,270 | 2,295 | 2,375 | 2,382 |
| Wright County | 18,443 | 18,256 | 18,146 | 18,073 | 17,905 | 17,978 | 18,004 | 17,907 | 17,949 | 17,955 |
Source: Population Division, U.S. Census Bureau