South Dakota
As of the census of 2000, there were 754844 residents, 290245 households, and 194330 families in the state. The population density was 9.9 people per square mile (3.82/kmē), it is fifth least densely populated state in United States. There were 323208 housing units at an average density of 4.3 per square mile (1.66/kmē). It has an average household size was 2.5 persons, and the average family size was 3.07 persons. The population's age distribution was 26.8% under the age of 18, 10.3% from 18 to 24, 27.3% from 25 to 44, 21.2% from 45 to 64, and 14.3% who were 65 or older. For every 100 females there were 98.5 males. For every 100 females age 18 and over, there were 96.1 males. The median age of the state's population was 35.6 years, the median age of male residents at 34.4 and the median age of female residents at 36.7. According to July 2008 Census Bureau estimates, the population of the state is 754844, The racial makeup of the state was 669404 White, 4685 Black or African American, 62283 American Indian, 4378 Asian, 261 Native Hawaiian, 10156 from two or more races and 3677 Ohter races.
The median income for a household in the state was $35282, making it the 11th poorest state by median household income among the United States. The median income for a family in the state was $43237, it is the tenth poorest state in terms of median family income. The per capita income for the state was $17562, making it the seventh poorest state by per capita income among the United States. The median income of state was $19276, The median income for males was $23467 versus $15435 for females. As of 2008, the gross domestic product (GDP) is about $37 billion, it is United States's fifth poorest state by GDP. South Dakota is responsible for 0.26 percent of the United States gross domestic product (GDP). Its Per capita personal income in 2008 was $37690.
In 2000, 208229 pupils and students, of which 50.4% are male and 49.6% are female, 27.59% of the total population, are in the education system. Of which, percentage of enrollment student are in, 6.1% nursery or pri school, 5.37% kindergarten, 44.55% elementary school, 23.39% high school and 20.6% College graduate school.
| Rank | County | Total Area mi2 | Land Area mi2 | Water Area mi2 | Population | Density mi2 | Per capita Income | House hold Income | Family Income |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Aurora County | 712.53 | 708.18 | 4.35 | 3058 | 4.3 | 13887 | 29783 | 37227 |
| 2 | Beadle County | 1264.82 | 1258.7 | 6.13 | 17023 | 13.5 | 17832 | 30510 | 40596 |
| 3 | Bennett County | 1190.59 | 1185.29 | 5.3 | 3574 | 3 | 10106 | 25313 | 28363 |
| 4 | Bon Homme County | 581.32 | 563.34 | 17.98 | 7260 | 12.9 | 13892 | 30644 | 36924 |
| 5 | Brookings County | 804.76 | 794.46 | 10.3 | 28220 | 35.5 | 17586 | 35438 | 48052 |
| 6 | Brown County | 1731.21 | 1713.07 | 18.14 | 35460 | 20.7 | 18464 | 35017 | 44788 |
| 7 | Brule County | 846.49 | 818.96 | 27.54 | 5364 | 6.5 | 14874 | 32370 | 37361 |
| 8 | Buffalo County | 487.43 | 470.59 | 16.83 | 2032 | 4.3 | 5213 | 12692 | 14167 |
| 9 | Butte County | 2266.36 | 2248.51 | 17.84 | 9094 | 4 | 13997 | 29040 | 34173 |
| 10 | Campbell County | 771.34 | 735.79 | 35.54 | 1782 | 2.4 | 14117 | 28793 | 35938 |
| 11 | Charles Mix County | 1150.19 | 1097.57 | 52.61 | 9350 | 8.5 | 11502 | 26060 | 30688 |
| 12 | Clark County | 967.79 | 957.92 | 9.87 | 4143 | 4.3 | 15597 | 30208 | 35559 |
| 13 | Clay County | 416.7 | 411.6 | 5.1 | 13537 | 32.9 | 14452 | 27535 | 41391 |
| 14 | Codington County | 717.08 | 687.67 | 29.41 | 25897 | 37.7 | 18761 | 36257 | 45153 |
| 15 | Corson County | 2529.42 | 2472.93 | 56.48 | 4181 | 1.7 | 8615 | 20654 | 23889 |
| 16 | Custer County | 1559.14 | 1557.69 | 1.45 | 7275 | 4.7 | 17945 | 36303 | 43628 |
| 17 | Davison County | 436.78 | 435.44 | 1.34 | 18741 | 43 | 17879 | 33476 | 44357 |
| 18 | Day County | 1091.21 | 1028.57 | 62.63 | 6267 | 6.1 | 15856 | 30227 | 38011 |
| 19 | Deuel County | 636.72 | 623.55 | 13.17 | 4498 | 7.2 | 15977 | 31788 | 39511 |
| 20 | Dewey County | 2445.67 | 2302.64 | 143.03 | 5972 | 2.6 | 9251 | 23272 | 24917 |
| 21 | Douglas County | 434.13 | 433.53 | 0.6 | 3458 | 8 | 13827 | 28478 | 33935 |
| 22 | Edmunds County | 1151.16 | 1145.58 | 5.58 | 4367 | 3.8 | 16149 | 32205 | 37174 |
| 23 | Fall River County | 1749.14 | 1739.86 | 9.28 | 7453 | 4.3 | 17048 | 29631 | 37827 |
| 24 | Faulk County | 1005.69 | 1000.14 | 5.55 | 2640 | 2.6 | 14660 | 30237 | 34508 |
| 25 | Grant County | 687.91 | 682.51 | 5.4 | 7847 | 11.5 | 16543 | 33088 | 40407 |
| 26 | Gregory County | 1053.45 | 1015.93 | 37.51 | 4792 | 4.7 | 13656 | 22732 | 30833 |
| 27 | Haakon County | 1827.22 | 1812.97 | 14.26 | 2196 | 1.2 | 16780 | 29894 | 35958 |
| 28 | Hamlin County | 537.96 | 506.86 | 31.1 | 5540 | 10.9 | 16982 | 33851 | 41511 |
| 29 | Hand County | 1440.21 | 1436.58 | 3.63 | 3741 | 2.6 | 18735 | 32377 | 38017 |
| 30 | Hanson County | 435.64 | 434.76 | 0.87 | 3139 | 7.2 | 14778 | 33049 | 39500 |
| 31 | Harding County | 2677.58 | 2670.5 | 7.08 | 1353 | 0.5 | 12794 | 25000 | 31667 |
| 32 | Hughes County | 800.29 | 740.92 | 59.37 | 16481 | 22.2 | 20689 | 42970 | 51235 |
| 33 | Hutchinson County | 814.37 | 812.82 | 1.55 | 8075 | 9.9 | 15922 | 30026 | 37715 |
| 34 | Hyde County | 866.59 | 860.97 | 5.62 | 1671 | 1.9 | 16356 | 31103 | 40700 |
| 35 | Jackson County | 1871.24 | 1869.13 | 2.12 | 2930 | 1.6 | 9981 | 23945 | 25161 |
| 36 | Jerauld County | 532.63 | 529.91 | 2.72 | 2295 | 4.3 | 16856 | 30690 | 36076 |
| 37 | Jones County | 971.66 | 970.52 | 1.14 | 1193 | 1.2 | 15896 | 30288 | 37500 |
| 38 | Kingsbury County | 863.67 | 838.37 | 25.3 | 5815 | 6.9 | 16522 | 31262 | 41057 |
| 39 | Lake County | 575.06 | 563.23 | 11.83 | 11276 | 20 | 16446 | 34087 | 43750 |
| 40 | Lawrence County | 800.31 | 800.04 | 0.28 | 21802 | 27.3 | 17195 | 31755 | 40501 |
| 41 | Lincoln County | 578.59 | 578.09 | 0.5 | 24131 | 41.7 | 22304 | 48338 | 55401 |
| 42 | Lyman County | 1707.06 | 1639.96 | 67.1 | 3895 | 2.4 | 13862 | 28509 | 32028 |
| 43 | McCook County | 577.16 | 574.52 | 2.64 | 5832 | 10.2 | 16374 | 35396 | 42609 |
| 44 | McPherson County | 1151.85 | 1136.94 | 14.91 | 2904 | 2.6 | 12748 | 22380 | 29811 |
| 45 | Marshall County | 885.63 | 837.71 | 47.92 | 4576 | 5.5 | 15462 | 30567 | 36295 |
| 46 | Meade County | 3482.46 | 3470.63 | 11.82 | 24253 | 7 | 17680 | 36992 | 40537 |
| 47 | Mellette County | 1309.75 | 1306.49 | 3.26 | 2083 | 1.6 | 10362 | 23219 | 25221 |
| 48 | Miner County | 571.99 | 570.34 | 1.65 | 2884 | 5.1 | 15155 | 29519 | 36667 |
| 49 | Minnehaha County | 813.69 | 809.67 | 4.01 | 148281 | 183.1 | 20713 | 42566 | 52031 |
| 50 | Moody County | 521.1 | 519.67 | 1.43 | 6595 | 12.7 | 16541 | 35467 | 41623 |
| 51 | Pennington County | 2784.31 | 2776.15 | 8.16 | 88565 | 31.9 | 18938 | 37485 | 44796 |
| 52 | Perkins County | 2890.71 | 2871.62 | 19.09 | 3363 | 1.2 | 15734 | 27750 | 33537 |
| 53 | Potter County | 898.43 | 866.49 | 31.94 | 2693 | 3.1 | 17417 | 30086 | 37827 |
| 54 | Roberts County | 1135.35 | 1101.28 | 34.08 | 10016 | 9.1 | 13428 | 28322 | 33361 |
| 55 | Sanborn County | 570.21 | 569.01 | 1.2 | 2675 | 4.7 | 18301 | 33375 | 38256 |
| 56 | Shannon County | 2096.65 | 2093.88 | 2.77 | 12466 | 6 | 6286 | 20916 | 20897 |
| 57 | Spink County | 1510.05 | 1503.87 | 6.18 | 7454 | 5 | 15728 | 31717 | 37114 |
| 58 | Stanley County | 1516.99 | 1443.28 | 73.71 | 2772 | 1.9 | 20300 | 41170 | 47197 |
| 59 | Sully County | 1070.36 | 1006.9 | 63.46 | 1556 | 1.5 | 17407 | 32500 | 38304 |
| 60 | Todd County | 1390.9 | 1388.12 | 2.78 | 9050 | 6.5 | 7714 | 20035 | 19533 |
| 61 | Tripp County | 1617.4 | 1613.52 | 3.88 | 6430 | 4 | 13776 | 28333 | 36219 |
| 62 | Turner County | 617.45 | 616.82 | 0.63 | 8849 | 14.3 | 17343 | 36059 | 42704 |
| 63 | Union County | 467.08 | 460.38 | 6.7 | 12584 | 27.3 | 24355 | 44790 | 51227 |
| 64 | Walworth County | 744.22 | 707.81 | 36.41 | 5974 | 8.4 | 15492 | 27834 | 33654 |
| 65 | Yankton County | 532.62 | 521.55 | 11.07 | 21652 | 41.5 | 17312 | 35374 | 43600 |
| 66 | Ziebach County | 1971.05 | 1962.33 | 8.72 | 2519 | 1.3 | 7463 | 18063 | 18672 |