(Links below lead to Quick Facts for Missouri Counties: People, Business & Geography at U.S. Census Bureau.)
| Area | 7/1/2009 | 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 | 5,987,580 | 5,956,335 | 5,909,824 | 5,861,572 | 5,806,639 | 5,758,444 | 5,714,847 | 5,680,852 | 5,643,986 | 5,606,065 | 5,595,211 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Adair County | 25,135 | 24,998 | 24,629 | 24,675 | 24,569 | 24,763 | 24,785 | 24,974 | 24,919 | 24,961 | 24,977 |
| Andrew County | 17,052 | 16,914 | 16,835 | 16,850 | 16,506 | 16,580 | 16,613 | 16,513 | 16,589 | 16,530 | 16,492 |
| Atchison County | 6,036 | 6,015 | 6,097 | 6,061 | 6,182 | 6,261 | 6,276 | 6,251 | 6,383 | 6,405 | 6,430 |
| Audrain County | 25,556 | 25,777 | 25,697 | 25,941 | 25,798 | 25,544 | 25,741 | 25,801 | 25,721 | 25,807 | 25,853 |
| Barry County | 35,881 | 36,209 | 36,087 | 35,943 | 35,406 | 35,004 | 34,687 | 34,240 | 34,089 | 34,050 | 34,010 |
| Barton County | 12,386 | 12,521 | 12,722 | 12,917 | 12,931 | 12,907 | 12,900 | 12,771 | 12,682 | 12,541 | 12,541 |
| Bates County | 16,761 | 16,918 | 16,941 | 16,975 | 16,934 | 16,946 | 16,999 | 16,947 | 16,772 | 16,703 | 16,653 |
| Benton County | 18,461 | 18,534 | 18,586 | 18,351 | 18,359 | 18,088 | 17,819 | 17,490 | 17,366 | 17,233 | 17,180 |
| Bollinger County | 11,841 | 11,958 | 12,124 | 12,115 | 12,148 | 12,176 | 12,212 | 12,248 | 12,239 | 12,053 | 12,029 |
| Boone County | 156,377 | 154,331 | 152,313 | 149,824 | 146,337 | 143,419 | 141,544 | 139,759 | 137,683 | 135,846 | 135,454 |
| Buchanan County | 89,856 | 89,186 | 88,814 | 87,420 | 87,105 | 86,642 | 86,315 | 86,334 | 86,184 | 86,094 | 85,998 |
| Butler County | 41,471 | 41,247 | 41,120 | 41,371 | 41,258 | 40,897 | 40,686 | 40,785 | 40,682 | 40,799 | 40,867 |
| Caldwell County | 9,160 | 9,189 | 9,242 | 9,209 | 9,162 | 9,143 | 9,086 | 9,002 | 8,989 | 8,977 | 8,969 |
| Callaway County | 43,727 | 43,588 | 43,223 | 42,933 | 42,491 | 41,570 | 41,928 | 41,972 | 41,494 | 40,925 | 40,766 |
| Camden County | 40,705 | 40,711 | 40,402 | 39,863 | 39,070 | 38,390 | 38,004 | 37,794 | 37,356 | 37,228 | 37,051 |
| Cape Girardeau County | 73,957 | 73,217 | 72,643 | 72,149 | 71,141 | 70,622 | 69,813 | 69,514 | 69,231 | 68,792 | 68,693 |
| Carroll County | 9,535 | 9,705 | 9,838 | 9,929 | 10,071 | 10,055 | 10,100 | 10,172 | 10,179 | 10,275 | 10,285 |
| Carter County | 5,870 | 5,913 | 5,936 | 5,874 | 5,877 | 5,875 | 5,908 | 5,879 | 5,870 | 5,945 | 5,941 |
| Cass County | 100,184 | 99,281 | 97,900 | 95,379 | 93,269 | 91,367 | 88,480 | 86,955 | 84,665 | 82,603 | 82,092 |
| Cedar County | 13,544 | 13,700 | 13,789 | 13,897 | 14,019 | 13,859 | 13,819 | 13,816 | 13,861 | 13,733 | 13,733 |
| Chariton County | 7,594 | 7,671 | 7,755 | 7,885 | 7,982 | 8,088 | 8,127 | 8,236 | 8,255 | 8,409 | 8,438 |
| Christian County | 77,455 | 75,646 | 73,287 | 69,960 | 66,406 | 63,523 | 60,925 | 58,865 | 56,931 | 54,951 | 54,285 |
| Clark County | 7,127 | 7,160 | 7,200 | 7,192 | 7,211 | 7,231 | 7,274 | 7,366 | 7,433 | 7,389 | 7,416 |
| Clay County | 228,358 | 223,370 | 218,244 | 212,394 | 205,614 | 200,686 | 196,380 | 193,068 | 189,229 | 184,820 | 184,006 |
| Clinton County | 21,002 | 21,022 | 20,979 | 20,515 | 20,530 | 20,520 | 20,112 | 19,580 | 19,394 | 19,031 | 18,979 |
| Cole County | 75,018 | 74,388 | 73,587 | 73,113 | 72,579 | 72,171 | 72,571 | 72,053 | 71,613 | 71,479 | 71,397 |
| Cooper County | 17,298 | 17,326 | 17,544 | 17,416 | 17,273 | 17,110 | 16,904 | 16,944 | 16,661 | 16,702 | 16,670 |
| Crawford County | 23,915 | 23,877 | 23,981 | 23,742 | 23,610 | 23,505 | 23,423 | 23,227 | 22,784 | 22,830 | 22,804 |
| Dade County | 7,316 | 7,465 | 7,538 | 7,601 | 7,597 | 7,643 | 7,703 | 7,771 | 7,852 | 7,906 | 7,923 |
| Dallas County | 16,637 | 16,799 | 16,809 | 16,446 | 16,202 | 16,166 | 15,936 | 15,830 | 15,734 | 15,689 | 15,661 |
| Daviess County | 8,078 | 8,041 | 8,045 | 8,099 | 8,040 | 8,076 | 8,010 | 7,967 | 7,935 | 7,995 | 8,016 |
| DeKalb County | 12,112 | 12,181 | 12,302 | 12,330 | 12,248 | 12,353 | 12,999 | 12,992 | 13,009 | 13,108 | 11,597 |
| Dent County | 15,042 | 15,079 | 14,986 | 15,090 | 14,984 | 14,944 | 14,887 | 14,831 | 15,031 | 14,934 | 14,927 |
| Douglas County | 13,608 | 13,584 | 13,426 | 13,401 | 13,333 | 13,264 | 13,161 | 13,227 | 13,050 | 13,099 | 13,084 |
| Dunklin County | 31,039 | 31,326 | 31,518 | 31,733 | 32,023 | 31,974 | 32,373 | 32,639 | 32,873 | 33,108 | 33,155 |
| Franklin County | 101,263 | 100,867 | 99,997 | 99,046 | 98,159 | 97,274 | 96,329 | 95,715 | 94,857 | 94,059 | 93,807 |
| Gasconade County | 15,096 | 15,253 | 15,393 | 15,421 | 15,466 | 15,427 | 15,430 | 15,391 | 15,386 | 15,370 | 15,342 |
| Gentry County | 6,108 | 6,205 | 6,227 | 6,316 | 6,390 | 6,453 | 6,480 | 6,610 | 6,775 | 6,850 | 6,861 |
| Greene County | 269,630 | 266,898 | 263,800 | 259,653 | 254,454 | 250,898 | 247,583 | 244,733 | 242,682 | 240,814 | 240,391 |
| Grundy County | 10,047 | 10,083 | 10,070 | 10,071 | 10,170 | 10,106 | 10,203 | 10,158 | 10,335 | 10,415 | 10,432 |
| Harrison County | 8,769 | 8,738 | 8,762 | 8,718 | 8,765 | 8,653 | 8,713 | 8,719 | 8,751 | 8,864 | 8,850 |
| Henry County | 22,176 | 22,171 | 22,388 | 22,460 | 22,277 | 22,384 | 22,368 | 22,151 | 22,287 | 22,089 | 21,997 |
| Hickory County | 8,903 | 8,992 | 9,063 | 9,058 | 9,092 | 9,017 | 8,950 | 8,791 | 8,968 | 8,942 | 8,940 |
| Holt County | 4,868 | 4,895 | 4,960 | 4,943 | 5,020 | 5,092 | 5,137 | 5,137 | 5,303 | 5,323 | 5,351 |
| Howard County | 9,857 | 9,851 | 9,819 | 9,867 | 9,903 | 9,865 | 9,942 | 10,001 | 10,119 | 10,180 | 10,212 |
| Howell County | 38,921 | 38,968 | 38,540 | 38,309 | 38,066 | 37,532 | 37,327 | 37,168 | 37,104 | 37,232 | 37,238 |
| Iron County | 9,943 | 9,995 | 10,087 | 10,190 | 10,199 | 10,276 | 10,253 | 10,443 | 10,536 | 10,632 | 10,697 |
| Jackson County | 705,708 | 700,699 | 685,246 | 680,604 | 675,996 | 671,389 | 666,782 | 662,174 | 658,051 | 655,773 | 654,880 |
| Jasper County | 118,179 | 116,634 | 114,979 | 112,991 | 110,999 | 109,532 | 108,162 | 107,051 | 105,839 | 105,012 | 104,686 |
| Jefferson County | 219,046 | 217,599 | 215,904 | 213,768 | 210,615 | 208,186 | 205,097 | 202,619 | 200,669 | 198,740 | 198,099 |
| Johnson County | 52,657 | 52,161 | 52,009 | 51,687 | 51,473 | 51,212 | 50,538 | 49,884 | 49,310 | 48,481 | 48,258 |
| Knox County | 3,981 | 4,005 | 4,039 | 4,066 | 4,109 | 4,171 | 4,204 | 4,248 | 4,279 | 4,355 | 4,361 |
| Laclede County | 35,432 | 35,478 | 35,276 | 34,869 | 34,176 | 33,469 | 33,118 | 32,849 | 32,881 | 32,589 | 32,513 |
| Lafayette County | 32,572 | 32,824 | 32,652 | 32,795 | 32,860 | 32,775 | 32,876 | 32,859 | 32,868 | 33,019 | 32,960 |
| Lawrence County | 37,648 | 37,638 | 37,552 | 37,096 | 36,821 | 36,344 | 36,095 | 36,012 | 35,548 | 35,325 | 35,204 |
| Lewis County | 9,791 | 9,887 | 9,997 | 10,027 | 10,052 | 10,143 | 10,218 | 10,322 | 10,378 | 10,501 | 10,494 |
| Lincoln County | 53,311 | 52,726 | 51,491 | 49,694 | 47,408 | 45,368 | 43,859 | 42,187 | 40,749 | 39,254 | 38,944 |
| Linn County | 12,606 | 12,655 | 12,756 | 12,824 | 12,985 | 13,186 | 13,313 | 13,465 | 13,604 | 13,722 | 13,754 |
| Livingston County | 14,235 | 14,123 | 14,144 | 14,103 | 14,109 | 14,188 | 14,263 | 14,342 | 14,472 | 14,497 | 14,558 |
| Macon County | 15,359 | 15,434 | 15,463 | 15,490 | 15,536 | 15,454 | 15,537 | 15,429 | 15,610 | 15,738 | 15,762 |
| Madison County | 12,341 | 12,400 | 12,304 | 12,105 | 11,980 | 11,907 | 11,797 | 11,839 | 11,810 | 11,801 | 11,800 |
| Maries County | 8,821 | 8,924 | 9,027 | 9,015 | 8,983 | 8,925 | 8,734 | 8,744 | 8,772 | 8,896 | 8,903 |
| Marion County | 28,449 | 28,283 | 28,137 | 28,229 | 28,109 | 28,041 | 28,168 | 28,010 | 28,099 | 28,309 | 28,289 |
| McDonald County | 23,063 | 22,873 | 22,936 | 22,918 | 22,659 | 22,369 | 22,074 | 21,702 | 21,686 | 21,669 | 21,681 |
| Mercer County | 3,475 | 3,474 | 3,447 | 3,463 | 3,512 | 3,564 | 3,615 | 3,634 | 3,720 | 3,756 | 3,757 |
| Miller County | 24,778 | 24,817 | 24,804 | 24,711 | 24,547 | 24,474 | 24,051 | 24,097 | 23,926 | 23,629 | 23,564 |
| Mississippi County | 13,266 | 13,378 | 13,519 | 13,679 | 13,649 | 13,604 | 13,506 | 13,171 | 13,232 | 13,362 | 13,427 |
| Moniteau County | 15,132 | 15,075 | 15,091 | 15,053 | 15,052 | 14,873 | 14,950 | 14,906 | 14,753 | 14,835 | 14,827 |
| Monroe County | 8,993 | 9,138 | 9,195 | 9,194 | 9,187 | 9,239 | 9,262 | 9,251 | 9,285 | 9,323 | 9,311 |
| Montgomery County | 11,698 | 11,858 | 11,934 | 11,920 | 12,010 | 12,017 | 11,927 | 11,975 | 12,060 | 12,130 | 12,136 |
| Morgan County | 20,527 | 20,780 | 20,765 | 20,628 | 20,340 | 20,190 | 19,917 | 19,687 | 19,635 | 19,366 | 19,309 |
| New Madrid County | 17,480 | 17,537 | 17,670 | 17,838 | 18,090 | 18,562 | 18,894 | 19,082 | 19,478 | 19,665 | 19,760 |
| Newton County | 56,121 | 55,981 | 56,035 | 55,424 | 54,911 | 54,297 | 53,751 | 53,048 | 52,770 | 52,706 | 52,636 |
| Nodaway County | 22,130 | 22,041 | 22,051 | 22,014 | 22,055 | 22,004 | 21,936 | 21,992 | 21,940 | 21,875 | 21,912 |
| Oregon County | 10,291 | 10,324 | 10,344 | 10,378 | 10,270 | 10,312 | 10,278 | 10,237 | 10,178 | 10,332 | 10,344 |
| Osage County | 13,561 | 13,414 | 13,364 | 13,449 | 13,317 | 13,221 | 13,224 | 13,037 | 13,056 | 13,081 | 13,062 |
| Ozark County | 9,315 | 9,386 | 9,360 | 9,403 | 9,338 | 9,379 | 9,448 | 9,410 | 9,404 | 9,529 | 9,542 |
| Pemiscot County | 18,193 | 18,338 | 18,579 | 18,771 | 19,047 | 19,197 | 19,470 | 19,749 | 19,823 | 20,015 | 20,047 |
| Perry County | 18,847 | 18,707 | 18,742 | 18,466 | 18,428 | 18,318 | 18,211 | 18,256 | 18,143 | 18,136 | 18,132 |
| Pettis County | 41,421 | 41,065 | 40,794 | 40,538 | 40,127 | 39,626 | 39,485 | 39,407 | 39,487 | 39,441 | 39,403 |
| Phelps County | 42,248 | 42,132 | 42,451 | 42,420 | 41,995 | 41,555 | 41,095 | 40,658 | 39,925 | 39,882 | 39,825 |
| Pike County | 18,406 | 18,498 | 18,446 | 18,592 | 18,629 | 18,317 | 18,390 | 18,307 | 18,267 | 18,314 | 18,351 |
| Platte County | 90,688 | 89,303 | 87,658 | 85,618 | 84,037 | 82,238 | 80,411 | 78,552 | 76,424 | 74,245 | 73,781 |
| Polk County | 30,626 | 30,343 | 30,193 | 29,714 | 29,040 | 28,496 | 28,216 | 27,774 | 27,427 | 27,061 | 26,992 |
| Pulaski County | 46,457 | 44,760 | 44,402 | 43,871 | 43,929 | 44,101 | 44,586 | 43,791 | 42,867 | 41,712 | 41,165 |
| Putnam County | 4,759 | 4,838 | 4,880 | 5,023 | 5,032 | 5,036 | 5,091 | 5,140 | 5,187 | 5,240 | 5,223 |
| Ralls County | 9,634 | 9,670 | 9,729 | 9,729 | 9,694 | 9,552 | 9,570 | 9,631 | 9,635 | 9,653 | 9,626 |
| Randolph County | 25,501 | 25,641 | 25,608 | 25,457 | 25,434 | 25,196 | 25,008 | 24,711 | 24,696 | 24,670 | 24,663 |
| Ray County | 23,358 | 23,531 | 23,520 | 23,671 | 23,457 | 23,621 | 23,608 | 23,478 | 23,390 | 23,374 | 23,354 |
| Reynolds County | 6,202 | 6,315 | 6,403 | 6,435 | 6,480 | 6,542 | 6,545 | 6,589 | 6,527 | 6,717 | 6,689 |
| Ripley County | 13,395 | 13,477 | 13,558 | 13,620 | 13,564 | 13,566 | 13,545 | 13,480 | 13,403 | 13,492 | 13,509 |
| Saline County | 22,821 | 22,595 | 22,710 | 22,759 | 22,862 | 22,947 | 22,869 | 22,963 | 23,404 | 23,742 | 23,756 |
| Schuyler County | 4,144 | 4,123 | 4,086 | 4,066 | 4,109 | 4,175 | 4,158 | 4,171 | 4,144 | 4,168 | 4,170 |
| Scotland County | 4,803 | 4,788 | 4,803 | 4,790 | 4,765 | 4,818 | 4,862 | 4,869 | 4,952 | 4,976 | 4,983 |
| Scott County | 40,855 | 40,764 | 40,825 | 40,702 | 40,620 | 40,431 | 40,398 | 40,273 | 40,416 | 40,389 | 40,422 |
| Shannon County | 8,361 | 8,350 | 8,341 | 8,250 | 8,246 | 8,211 | 8,180 | 8,257 | 8,297 | 8,319 | 8,324 |
| Shelby County | 6,325 | 6,376 | 6,455 | 6,487 | 6,644 | 6,632 | 6,646 | 6,713 | 6,780 | 6,788 | 6,799 |
| St. Charles County | 355,367 | 349,595 | 343,833 | 336,422 | 327,594 | 318,743 | 310,632 | 302,831 | 294,709 | 286,171 | 283,883 |
| St. Clair County | 9,276 | 9,360 | 9,437 | 9,367 | 9,457 | 9,484 | 9,483 | 9,569 | 9,587 | 9,671 | 9,652 |
| St. Francois County | 63,884 | 63,314 | 62,740 | 62,110 | 61,620 | 60,320 | 57,693 | 56,549 | 56,090 | 55,743 | 55,641 |
| St. Louis city | 356,587 | 356,730 | 355,663 | 353,837 | 352,572 | 350,705 | 348,039 | 350,908 | 350,240 | 346,904 | 348,189 |
| St. Louis County | 992,408 | 992,331 | 993,690 | 996,664 | 999,523 | 1,004,271 | 1,008,956 | 1,012,999 | 1,015,705 | 1,016,364 | 1,016,315 |
| Ste. Genevieve County | 17,542 | 17,699 | 17,829 | 17,846 | 17,876 | 17,924 | 17,921 | 17,866 | 17,898 | 17,908 | 17,842 |
| Stoddard County | 29,069 | 29,387 | 29,632 | 29,762 | 29,771 | 29,688 | 29,611 | 29,779 | 29,652 | 29,693 | 29,705 |
| Stone County | 31,424 | 31,495 | 31,452 | 31,099 | 30,460 | 30,308 | 29,905 | 29,318 | 28,899 | 28,740 | 28,658 |
| Sullivan County | 6,835 | 6,831 | 6,798 | 6,851 | 6,894 | 6,968 | 7,074 | 7,269 | 7,248 | 7,224 | 7,219 |
| Taney County | 48,023 | 47,274 | 45,880 | 44,364 | 43,118 | 42,176 | 41,522 | 40,925 | 40,240 | 39,937 | 39,703 |
| Texas County | 24,563 | 24,497 | 24,522 | 24,535 | 24,270 | 24,292 | 23,978 | 24,173 | 24,023 | 23,001 | 23,003 |
| Vernon County | 20,166 | 20,099 | 20,050 | 20,111 | 20,210 | 20,211 | 20,185 | 20,263 | 20,412 | 20,414 | 20,454 |
| Warren County | 31,485 | 31,153 | 30,463 | 29,558 | 28,588 | 27,581 | 26,872 | 26,076 | 25,325 | 24,721 | 24,525 |
| Washington County | 24,400 | 24,488 | 24,305 | 24,142 | 23,815 | 23,866 | 23,721 | 23,665 | 23,453 | 23,410 | 23,344 |
| Wayne County | 12,392 | 12,454 | 12,519 | 12,701 | 12,898 | 12,904 | 13,060 | 13,076 | 13,247 | 13,256 | 13,259 |
| Webster County | 36,552 | 36,439 | 35,892 | 35,022 | 34,271 | 33,613 | 32,848 | 32,453 | 31,959 | 31,260 | 31,045 |
| Worth County | 2,014 | 2,011 | 2,070 | 2,074 | 2,120 | 2,178 | 2,218 | 2,269 | 2,295 | 2,375 | 2,382 |
| Wright County | 17,908 | 18,255 | 18,130 | 18,048 | 18,069 | 17,903 | 17,976 | 18,002 | 17,907 | 17,949 | 17,955 |
Source: Population Division, U.S. Census Bureau