(Links below lead to Quick Facts for South Dakota 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 |
| South Dakota | 804,194 | 795,689 | 787,380 | 779,315 | 773,539 | 766,440 | 761,709 | 758,705 | 755,657 | 754,844 |
|---|---|---|---|---|---|---|---|---|---|---|
| Aurora County | 2,867 | 2,847 | 2,869 | 2,862 | 2,926 | 2,917 | 2,916 | 2,981 | 3,060 | 3,058 |
| Beadle County | 15,878 | 15,706 | 15,452 | 15,743 | 15,913 | 16,149 | 16,518 | 16,805 | 16,983 | 17,023 |
| Bennett County | 3,393 | 3,414 | 3,417 | 3,500 | 3,483 | 3,485 | 3,501 | 3,509 | 3,573 | 3,574 |
| Bon Homme County | 7,079 | 7,055 | 7,139 | 6,958 | 6,993 | 7,072 | 7,094 | 7,179 | 7,248 | 7,260 |
| Brookings County | 29,668 | 29,329 | 29,025 | 28,474 | 28,582 | 28,557 | 28,508 | 28,339 | 28,289 | 28,220 |
| Brown County | 35,154 | 35,128 | 34,861 | 34,875 | 34,869 | 34,847 | 34,907 | 35,115 | 35,384 | 35,460 |
| Brule County | 5,205 | 5,180 | 5,101 | 5,113 | 5,130 | 5,149 | 5,144 | 5,232 | 5,351 | 5,364 |
| Buffalo County | 2,142 | 2,094 | 2,113 | 2,069 | 2,070 | 2,052 | 2,031 | 2,040 | 2,008 | 2,032 |
| Butte County | 9,593 | 9,449 | 9,207 | 9,175 | 9,093 | 9,059 | 8,965 | 9,089 | 9,111 | 9,094 |
| Campbell County | 1,352 | 1,396 | 1,466 | 1,521 | 1,589 | 1,643 | 1,705 | 1,748 | 1,780 | 1,782 |
| Charles Mix County | 8,906 | 8,939 | 9,023 | 9,068 | 9,002 | 9,037 | 9,145 | 9,197 | 9,335 | 9,350 |
| Clark County | 3,436 | 3,467 | 3,525 | 3,673 | 3,776 | 3,866 | 3,943 | 4,112 | 4,121 | 4,143 |
| Clay County | 13,605 | 13,458 | 13,312 | 13,279 | 13,265 | 13,397 | 13,413 | 13,568 | 13,497 | 13,537 |
| Codington County | 26,317 | 26,344 | 26,138 | 25,863 | 25,849 | 25,863 | 25,880 | 25,902 | 25,904 | 25,897 |
| Corson County | 4,136 | 4,187 | 4,087 | 4,250 | 4,288 | 4,259 | 4,224 | 4,172 | 4,195 | 4,181 |
| Custer County | 7,811 | 7,806 | 7,848 | 7,719 | 7,727 | 7,567 | 7,475 | 7,334 | 7,287 | 7,275 |
| Davison County | 18,931 | 18,987 | 19,039 | 18,861 | 18,884 | 18,728 | 18,736 | 18,784 | 18,728 | 18,741 |
| Day County | 5,526 | 5,656 | 5,730 | 5,801 | 5,830 | 5,898 | 6,029 | 6,093 | 6,243 | 6,267 |
| Deuel County | 4,276 | 4,235 | 4,274 | 4,279 | 4,261 | 4,336 | 4,429 | 4,458 | 4,493 | 4,498 |
| Dewey County | 5,931 | 5,985 | 6,037 | 6,102 | 6,079 | 6,122 | 6,028 | 6,029 | 5,984 | 5,972 |
| Douglas County | 2,945 | 3,016 | 3,080 | 3,215 | 3,258 | 3,279 | 3,340 | 3,415 | 3,441 | 3,458 |
| Edmunds County | 4,034 | 3,996 | 4,004 | 4,079 | 4,072 | 4,167 | 4,214 | 4,291 | 4,353 | 4,367 |
| Fall River County | 7,145 | 7,198 | 7,231 | 7,267 | 7,229 | 7,257 | 7,274 | 7,372 | 7,400 | 7,453 |
| Faulk County | 2,255 | 2,266 | 2,286 | 2,326 | 2,379 | 2,450 | 2,494 | 2,542 | 2,626 | 2,640 |
| Grant County | 7,101 | 7,154 | 7,209 | 7,290 | 7,456 | 7,613 | 7,622 | 7,677 | 7,832 | 7,847 |
| Gregory County | 4,084 | 4,098 | 4,148 | 4,219 | 4,302 | 4,393 | 4,483 | 4,595 | 4,760 | 4,792 |
| Haakon County | 1,819 | 1,842 | 1,868 | 1,917 | 1,981 | 2,032 | 2,075 | 2,133 | 2,176 | 2,196 |
| Hamlin County | 5,660 | 5,610 | 5,525 | 5,560 | 5,508 | 5,520 | 5,543 | 5,543 | 5,549 | 5,540 |
| Hand County | 3,274 | 3,270 | 3,283 | 3,305 | 3,342 | 3,487 | 3,548 | 3,628 | 3,712 | 3,741 |
| Hanson County | 3,609 | 3,599 | 3,571 | 3,653 | 3,620 | 3,410 | 3,338 | 3,290 | 3,154 | 3,139 |
| Harding County | 1,145 | 1,173 | 1,193 | 1,182 | 1,219 | 1,283 | 1,285 | 1,318 | 1,341 | 1,353 |
| Hughes County | 16,746 | 16,877 | 16,753 | 16,724 | 16,632 | 16,542 | 16,538 | 16,386 | 16,488 | 16,481 |
| Hutchinson County | 7,250 | 7,324 | 7,375 | 7,493 | 7,584 | 7,716 | 7,776 | 7,918 | 8,069 | 8,075 |
| Hyde County | 1,424 | 1,456 | 1,525 | 1,580 | 1,602 | 1,578 | 1,552 | 1,612 | 1,666 | 1,671 |
| Jackson County | 2,711 | 2,776 | 2,765 | 2,790 | 2,787 | 2,810 | 2,799 | 2,809 | 2,940 | 2,930 |
| Jerauld County | 1,982 | 1,986 | 2,039 | 2,076 | 2,085 | 2,147 | 2,199 | 2,236 | 2,279 | 2,295 |
| Jones County | 1,024 | 1,047 | 1,068 | 1,055 | 1,086 | 1,086 | 1,124 | 1,142 | 1,184 | 1,193 |
| Kingsbury County | 5,394 | 5,378 | 5,374 | 5,424 | 5,400 | 5,506 | 5,580 | 5,668 | 5,810 | 5,815 |
| Lake County | 11,693 | 11,419 | 11,118 | 11,007 | 10,921 | 11,008 | 11,100 | 11,247 | 11,244 | 11,276 |
| Lawrence County | 23,524 | 23,388 | 22,971 | 22,705 | 22,463 | 22,019 | 21,696 | 21,705 | 21,763 | 21,802 |
| Lincoln County | 39,713 | 37,732 | 35,699 | 33,703 | 31,669 | 29,238 | 27,726 | 26,168 | 24,529 | 24,131 |
| Lyman County | 3,811 | 3,882 | 3,859 | 3,842 | 3,898 | 3,913 | 3,900 | 3,898 | 3,908 | 3,895 |
| Marshall County | 4,320 | 4,310 | 4,355 | 4,375 | 4,341 | 4,267 | 4,341 | 4,457 | 4,581 | 4,576 |
| McCook County | 5,671 | 5,747 | 5,721 | 5,823 | 5,830 | 5,798 | 5,792 | 5,869 | 5,849 | 5,832 |
| McPherson County | 2,480 | 2,485 | 2,524 | 2,611 | 2,653 | 2,725 | 2,770 | 2,827 | 2,890 | 2,904 |
| Meade County | 23,989 | 24,057 | 24,283 | 24,490 | 24,615 | 24,382 | 24,402 | 24,199 | 24,213 | 24,253 |
| Mellette County | 1,982 | 2,016 | 2,010 | 2,009 | 2,003 | 2,059 | 2,040 | 2,070 | 2,088 | 2,083 |
| Miner County | 2,435 | 2,468 | 2,511 | 2,536 | 2,584 | 2,625 | 2,751 | 2,811 | 2,882 | 2,884 |
| Minnehaha County | 179,180 | 175,142 | 171,694 | 166,740 | 162,672 | 159,092 | 155,436 | 152,435 | 149,079 | 148,281 |
| Moody County | 6,414 | 6,476 | 6,464 | 6,484 | 6,474 | 6,443 | 6,503 | 6,579 | 6,579 | 6,595 |
| Pennington County | 98,533 | 96,230 | 94,662 | 93,541 | 92,928 | 91,492 | 90,843 | 89,979 | 88,794 | 88,565 |
| Perkins County | 2,900 | 2,907 | 2,949 | 2,961 | 3,031 | 3,132 | 3,245 | 3,276 | 3,340 | 3,363 |
| Potter County | 2,123 | 2,183 | 2,261 | 2,318 | 2,409 | 2,471 | 2,499 | 2,562 | 2,673 | 2,693 |
| Roberts County | 9,851 | 9,849 | 9,892 | 9,897 | 10,003 | 9,961 | 9,840 | 10,014 | 10,002 | 10,016 |
| Sanborn County | 2,447 | 2,448 | 2,457 | 2,504 | 2,586 | 2,606 | 2,569 | 2,575 | 2,674 | 2,675 |
| Shannon County | 13,637 | 13,587 | 13,643 | 13,362 | 13,165 | 13,137 | 12,985 | 12,670 | 12,556 | 12,466 |
| Spink County | 6,664 | 6,707 | 6,805 | 6,835 | 6,904 | 6,960 | 7,090 | 7,213 | 7,420 | 7,454 |
| Stanley County | 2,703 | 2,773 | 2,750 | 2,756 | 2,789 | 2,724 | 2,700 | 2,731 | 2,775 | 2,772 |
| Sully County | 1,356 | 1,396 | 1,393 | 1,390 | 1,398 | 1,427 | 1,483 | 1,532 | 1,548 | 1,556 |
| Todd County | 10,167 | 10,127 | 9,881 | 9,768 | 9,687 | 9,433 | 9,360 | 9,232 | 9,085 | 9,050 |
| Tripp County | 5,681 | 5,799 | 5,940 | 6,018 | 6,033 | 6,155 | 6,234 | 6,270 | 6,386 | 6,430 |
| Turner County | 8,366 | 8,372 | 8,348 | 8,405 | 8,509 | 8,562 | 8,570 | 8,742 | 8,849 | 8,849 |
| Union County | 14,131 | 13,933 | 13,591 | 13,302 | 13,157 | 12,985 | 12,805 | 12,636 | 12,590 | 12,584 |
| Walworth County | 5,238 | 5,240 | 5,360 | 5,429 | 5,460 | 5,498 | 5,664 | 5,791 | 5,925 | 5,974 |
| Yankton County | 21,835 | 21,672 | 21,639 | 21,617 | 21,667 | 21,525 | 21,476 | 21,467 | 21,606 | 21,652 |
| Ziebach County | 2,542 | 2,616 | 2,640 | 2,547 | 2,539 | 2,524 | 2,514 | 2,489 | 2,475 | 2,519 |
Source: Population Division, U.S. Census Bureau