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(Links below lead to Quick Facts for South Dakota 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 |
| South Dakota | 812,383 | 804,532 | 797,035 | 788,519 | 780,084 | 774,283 | 766,975 | 762,107 | 758,983 | 755,694 | 754,844 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Aurora County | 2,868 | 2,886 | 2,865 | 2,887 | 2,886 | 2,942 | 2,928 | 2,921 | 2,982 | 3,060 | 3,058 |
| Beadle County | 16,266 | 15,946 | 15,760 | 15,501 | 15,754 | 15,921 | 16,154 | 16,522 | 16,806 | 16,983 | 17,023 |
| Bennett County | 3,348 | 3,367 | 3,407 | 3,421 | 3,499 | 3,482 | 3,484 | 3,501 | 3,509 | 3,573 | 3,574 |
| Bon Homme County | 6,995 | 7,008 | 7,013 | 7,140 | 6,960 | 6,994 | 7,073 | 7,093 | 7,178 | 7,248 | 7,260 |
| Brookings County | 30,056 | 29,854 | 29,517 | 29,198 | 28,559 | 28,645 | 28,605 | 28,539 | 28,356 | 28,295 | 28,220 |
| Brown County | 35,204 | 35,024 | 35,077 | 34,907 | 34,869 | 34,862 | 34,842 | 34,904 | 35,111 | 35,382 | 35,460 |
| Brule County | 5,275 | 5,204 | 5,165 | 5,090 | 5,111 | 5,129 | 5,148 | 5,144 | 5,231 | 5,351 | 5,364 |
| Buffalo County | 2,067 | 2,136 | 2,079 | 2,105 | 2,069 | 2,070 | 2,052 | 2,032 | 2,040 | 2,008 | 2,032 |
| Butte County | 9,577 | 9,603 | 9,480 | 9,237 | 9,192 | 9,107 | 9,070 | 8,973 | 9,092 | 9,111 | 9,094 |
| Campbell County | 1,344 | 1,355 | 1,390 | 1,452 | 1,520 | 1,589 | 1,642 | 1,704 | 1,748 | 1,780 | 1,782 |
| Charles Mix County | 8,984 | 8,925 | 8,960 | 9,046 | 9,081 | 9,010 | 9,041 | 9,147 | 9,196 | 9,335 | 9,350 |
| Clark County | 3,431 | 3,477 | 3,502 | 3,532 | 3,671 | 3,772 | 3,863 | 3,941 | 4,111 | 4,121 | 4,143 |
| Clay County | 13,490 | 13,597 | 13,458 | 13,332 | 13,278 | 13,261 | 13,396 | 13,413 | 13,570 | 13,498 | 13,537 |
| Codington County | 26,168 | 26,223 | 26,309 | 26,109 | 25,836 | 25,830 | 25,852 | 25,873 | 25,898 | 25,899 | 25,897 |
| Corson County | 4,093 | 4,120 | 4,177 | 4,088 | 4,252 | 4,290 | 4,261 | 4,224 | 4,172 | 4,195 | 4,181 |
| Custer County | 7,924 | 7,917 | 7,885 | 7,888 | 7,713 | 7,724 | 7,565 | 7,474 | 7,334 | 7,287 | 7,275 |
| Davison County | 18,929 | 18,898 | 18,967 | 19,041 | 18,826 | 18,859 | 18,712 | 18,727 | 18,781 | 18,727 | 18,741 |
| Day County | 5,509 | 5,525 | 5,647 | 5,710 | 5,796 | 5,822 | 5,890 | 6,023 | 6,091 | 6,243 | 6,267 |
| Deuel County | 4,203 | 4,233 | 4,202 | 4,269 | 4,282 | 4,263 | 4,337 | 4,430 | 4,459 | 4,493 | 4,498 |
| Dewey County | 5,969 | 5,915 | 5,988 | 6,053 | 6,109 | 6,084 | 6,126 | 6,030 | 6,030 | 5,984 | 5,972 |
| Douglas County | 2,933 | 2,968 | 3,043 | 3,093 | 3,212 | 3,255 | 3,277 | 3,338 | 3,413 | 3,439 | 3,458 |
| Edmunds County | 3,935 | 3,967 | 3,949 | 3,979 | 4,074 | 4,069 | 4,163 | 4,212 | 4,290 | 4,353 | 4,367 |
| Fall River County | 7,241 | 7,167 | 7,211 | 7,267 | 7,313 | 7,251 | 7,265 | 7,262 | 7,356 | 7,400 | 7,453 |
| Faulk County | 2,210 | 2,276 | 2,279 | 2,290 | 2,325 | 2,378 | 2,450 | 2,494 | 2,541 | 2,626 | 2,640 |
| Grant County | 7,068 | 7,110 | 7,154 | 7,203 | 7,288 | 7,456 | 7,614 | 7,622 | 7,678 | 7,832 | 7,847 |
| Gregory County | 4,003 | 4,022 | 4,052 | 4,123 | 4,217 | 4,301 | 4,393 | 4,482 | 4,595 | 4,760 | 4,792 |
| Haakon County | 1,777 | 1,786 | 1,813 | 1,854 | 1,917 | 1,981 | 2,032 | 2,075 | 2,133 | 2,176 | 2,196 |
| Hamlin County | 5,754 | 5,657 | 5,611 | 5,518 | 5,560 | 5,507 | 5,520 | 5,543 | 5,542 | 5,549 | 5,540 |
| Hand County | 3,238 | 3,259 | 3,263 | 3,279 | 3,301 | 3,339 | 3,486 | 3,548 | 3,628 | 3,712 | 3,741 |
| Hanson County | 3,553 | 3,584 | 3,584 | 3,560 | 3,646 | 3,615 | 3,407 | 3,335 | 3,289 | 3,154 | 3,139 |
| Harding County | 1,123 | 1,139 | 1,166 | 1,187 | 1,180 | 1,215 | 1,281 | 1,283 | 1,317 | 1,341 | 1,353 |
| Hughes County | 16,969 | 16,793 | 16,940 | 16,798 | 16,780 | 16,669 | 16,566 | 16,551 | 16,390 | 16,488 | 16,481 |
| Hutchinson County | 7,124 | 7,190 | 7,290 | 7,343 | 7,492 | 7,582 | 7,714 | 7,774 | 7,916 | 8,069 | 8,075 |
| Hyde County | 1,393 | 1,395 | 1,436 | 1,502 | 1,579 | 1,601 | 1,578 | 1,552 | 1,612 | 1,666 | 1,671 |
| Jackson County | 2,658 | 2,660 | 2,746 | 2,749 | 2,788 | 2,786 | 2,810 | 2,799 | 2,809 | 2,940 | 2,930 |
| Jerauld County | 1,953 | 1,961 | 1,959 | 2,020 | 2,075 | 2,083 | 2,147 | 2,199 | 2,236 | 2,279 | 2,295 |
| Jones County | 1,037 | 1,015 | 1,040 | 1,072 | 1,055 | 1,086 | 1,086 | 1,124 | 1,142 | 1,184 | 1,193 |
| Kingsbury County | 5,308 | 5,307 | 5,324 | 5,355 | 5,430 | 5,404 | 5,508 | 5,579 | 5,667 | 5,810 | 5,815 |
| Lake County | 11,994 | 11,841 | 11,494 | 11,145 | 11,028 | 10,937 | 11,019 | 11,108 | 11,252 | 11,245 | 11,276 |
| Lawrence County | 23,498 | 23,362 | 23,292 | 22,945 | 22,698 | 22,459 | 22,016 | 21,696 | 21,705 | 21,763 | 21,802 |
| Lincoln County | 41,218 | 39,685 | 37,750 | 35,707 | 33,673 | 31,648 | 29,226 | 27,722 | 26,169 | 24,529 | 24,131 |
| Lyman County | 3,891 | 3,809 | 3,881 | 3,854 | 3,839 | 3,896 | 3,911 | 3,899 | 3,898 | 3,909 | 3,895 |
| Marshall County | 4,160 | 4,237 | 4,243 | 4,318 | 4,373 | 4,339 | 4,266 | 4,341 | 4,457 | 4,581 | 4,576 |
| McCook County | 5,619 | 5,640 | 5,725 | 5,692 | 5,809 | 5,821 | 5,790 | 5,787 | 5,868 | 5,849 | 5,832 |
| McPherson County | 2,439 | 2,485 | 2,489 | 2,551 | 2,612 | 2,653 | 2,724 | 2,769 | 2,826 | 2,890 | 2,904 |
| Meade County | 23,916 | 23,852 | 24,082 | 24,295 | 24,487 | 24,613 | 24,382 | 24,404 | 24,203 | 24,214 | 24,253 |
| Mellette County | 2,042 | 2,007 | 2,049 | 2,033 | 2,027 | 2,016 | 2,068 | 2,045 | 2,072 | 2,088 | 2,083 |
| Miner County | 2,420 | 2,393 | 2,433 | 2,494 | 2,532 | 2,580 | 2,623 | 2,750 | 2,811 | 2,882 | 2,884 |
| Minnehaha County | 183,048 | 179,862 | 176,125 | 172,333 | 167,375 | 163,350 | 159,575 | 155,817 | 152,714 | 149,117 | 148,281 |
| Moody County | 6,375 | 6,438 | 6,512 | 6,482 | 6,495 | 6,481 | 6,447 | 6,504 | 6,581 | 6,580 | 6,595 |
| Pennington County | 100,850 | 98,845 | 96,517 | 94,817 | 93,488 | 92,890 | 91,467 | 90,831 | 89,974 | 88,794 | 88,565 |
| Perkins County | 2,869 | 2,900 | 2,929 | 2,954 | 2,964 | 3,031 | 3,131 | 3,242 | 3,274 | 3,340 | 3,363 |
| Potter County | 2,053 | 2,110 | 2,192 | 2,265 | 2,316 | 2,409 | 2,470 | 2,499 | 2,562 | 2,673 | 2,693 |
| Roberts County | 9,933 | 9,951 | 9,942 | 9,933 | 9,900 | 10,006 | 9,964 | 9,841 | 10,015 | 10,002 | 10,016 |
| Sanborn County | 2,432 | 2,444 | 2,453 | 2,460 | 2,503 | 2,585 | 2,605 | 2,569 | 2,575 | 2,674 | 2,675 |
| Shannon County | 13,727 | 13,641 | 13,606 | 13,637 | 13,352 | 13,157 | 13,132 | 12,982 | 12,668 | 12,556 | 12,466 |
| Spink County | 6,554 | 6,563 | 6,630 | 6,785 | 6,831 | 6,902 | 6,959 | 7,090 | 7,213 | 7,420 | 7,454 |
| Stanley County | 2,792 | 2,762 | 2,797 | 2,768 | 2,758 | 2,790 | 2,724 | 2,699 | 2,731 | 2,775 | 2,772 |
| Sully County | 1,348 | 1,362 | 1,413 | 1,403 | 1,391 | 1,398 | 1,427 | 1,482 | 1,532 | 1,548 | 1,556 |
| Todd County | 10,095 | 10,096 | 10,104 | 9,887 | 9,801 | 9,710 | 9,448 | 9,369 | 9,234 | 9,084 | 9,050 |
| Tripp County | 5,541 | 5,603 | 5,735 | 5,910 | 6,015 | 6,032 | 6,154 | 6,234 | 6,269 | 6,386 | 6,430 |
| Turner County | 8,237 | 8,316 | 8,361 | 8,340 | 8,402 | 8,506 | 8,560 | 8,569 | 8,742 | 8,849 | 8,849 |
| Union County | 14,589 | 14,189 | 13,983 | 13,643 | 13,332 | 13,178 | 13,001 | 12,815 | 12,639 | 12,589 | 12,584 |
| Walworth County | 5,228 | 5,258 | 5,271 | 5,376 | 5,426 | 5,457 | 5,497 | 5,662 | 5,791 | 5,925 | 5,974 |
| Yankton County | 21,986 | 21,883 | 21,710 | 21,658 | 21,617 | 21,670 | 21,529 | 21,482 | 21,471 | 21,606 | 21,652 |
| Ziebach County | 2,552 | 2,529 | 2,609 | 2,636 | 2,545 | 2,535 | 2,522 | 2,512 | 2,488 | 2,475 | 2,519 |
Source: Population Division, U.S. Census Bureau