Summary: Summary of age-related census data for 1990 and 2000
| | Amount |
| | 2000 | | 1990 | |
| | South Dakota | National | % National | South Dakota | National | % National |
| Households | | | | | | |
| All | 290,245 | 105,480,101 | 0.3% | 259,034 | 91,947,410 | 0.3% |
| Age 65+ | 72,515 | 24,672,708 | 0.3% | 69,819 | 22,154,422 | 0.3% |
| Alone | 32,163 | 9,722,857 | 0.3% | 31,560 | 8,824,845 | 0.4% |
| Not Alone | 40,352 | 14,949,851 | 0.3% | 38,259 | 13,329,577 | 0.3% |
| | | | | | | |
| Population | | | | | | |
| All Ages | 754,844 | 281,421,906 | 0.3% | 696,004 | 248,709,873 | 0.3% |
| Under 5 years | 51,069 | 19,175,798 | 0.3% | 54,504 | 18,354,443 | 0.3% |
| 5 to 9 years | 54,486 | 20,549,505 | 0.3% | 58,795 | 18,099,179 | 0.3% |
| 10 to 14 years | 59,463 | 20,528,072 | 0.3% | 55,437 | 17,114,249 | 0.3% |
| 15 to 19 years | 62,463 | 20,219,890 | 0.3% | 50,571 | 17,754,015 | 0.3% |
| 20 to 24 years | 52,802 | 18,964,001 | 0.3% | 47,268 | 19,020,312 | 0.2% |
| 25 to 34 years | 91,013 | 39,891,724 | 0.2% | 109,413 | 43,175,932 | 0.3% |
| 35 to 44 years | 115,386 | 45,148,527 | 0.3% | 95,216 | 37,578,903 | 0.3% |
| 45 to 54 years | 97,682 | 37,677,952 | 0.3% | 62,669 | 25,223,086 | 0.2% |
| 55 to 59 years | 33,611 | 13,469,237 | 0.2% | 29,218 | 10,531,756 | 0.3% |
| 60 to 64 years | 28,738 | 10,805,447 | 0.3% | 30,582 | 10,616,167 | 0.3% |
| 65 to 74 years | 53,129 | 18,390,986 | 0.3% | 54,471 | 18,106,558 | 0.3% |
| 75 to 84 years | 38,916 | 12,361,180 | 0.3% | 34,517 | 10,055,108 | 0.3% |
| 85 years and over | 16,086 | 4,239,587 | 0.4% | 13,343 | 3,080,165 | 0.4% |
| | | | | | | |
| Under Age 15 | 165,018 | 60,253,375 | 0.3% | 168,736 | 53,567,871 | 0.3% |
| Age 15-24 | 115,265 | 39,183,891 | 0.3% | 97,839 | 36,774,327 | 0.3% |
| Age 25-34 | 91,013 | 39,891,724 | 0.2% | 109,413 | 43,175,932 | 0.3% |
| Age 35-44 | 115,386 | 45,148,527 | 0.3% | 95,216 | 37,578,903 | 0.3% |
| Age 45-54 | 97,682 | 37,677,952 | 0.3% | 62,669 | 25,223,086 | 0.2% |
| Age 55-64 | 62,349 | 24,274,684 | 0.3% | 59,800 | 21,147,923 | 0.3% |
| Age 65-74 | 53,129 | 18,390,986 | 0.3% | 54,471 | 18,106,558 | 0.3% |
| Age 75-84 | 38,916 | 12,361,180 | 0.3% | 34,517 | 10,055,108 | 0.3% |
| Age 85+ | 16,086 | 4,239,587 | 0.4% | 13,343 | 3,080,165 | 0.4% |
| | | | | | | |
| Under Age 55 | 584,364 | 222,155,469 | 0.3% | 533,873 | 196,320,119 | 0.3% |
| Age 55+ | 170,480 | 59,266,437 | 0.3% | 162,131 | 52,389,754 | 0.3% |
| Age 65+ | 108,131 | 34,991,753 | 0.3% | 102,331 | 31,241,831 | 0.3% |
| Age 75+ | 55,002 | 16,600,767 | 0.3% | 47,860 | 13,135,273 | 0.4% |
| Age 85+ | 16,086 | 4,239,587 | 0.4% | 13,343 | 3,080,165 | 0.4% |
| | | | | | | |
| Age 65+ population living alone | 30% | 28% | | 31% | 28% | |
| | | | | | | |
| | 1990-2000 Change |
| | Amount of Change | Percentage Change |
| | South Dakota | National | % National | South Dakota | National | Difference |
| Households | | | | | | |
| All | 31,211 | 13,532,691 | 0.2% | 12% | 15% | (3%) |
| Age 65+ | 2,696 | 2,518,286 | 0.1% | 4% | 11% | (7%) |
| Alone | 603 | 898,012 | 0.1% | 2% | 10% | (8%) |
| Not Alone | 2,093 | 1,620,274 | 0.1% | 5% | 12% | (7%) |
| | | | | | | |
| Population | | | | | | |
| All Ages | 58,840 | 32,712,033 | 0.2% | 8% | 13% | (5%) |
| Under 5 years | (3,435) | 821,355 | (0.4%) | (6%) | 4% | (10%) |
| 5 to 9 years | (4,309) | 2,450,326 | (0.2%) | (7%) | 14% | (21%) |
| 10 to 14 years | 4,026 | 3,413,823 | 0.1% | 7% | 20% | (13%) |
| 15 to 19 years | 11,892 | 2,465,875 | 0.5% | 24% | 14% | 10% |
| 20 to 24 years | 5,534 | (56,311) | 9.8% | 12% | - | 12% |
| 25 to 34 years | (18,400) | (3,284,208) | (0.6%) | (17%) | (8%) | (9%) |
| 35 to 44 years | 20,170 | 7,569,624 | 0.3% | 21% | 20% | 1% |
| 45 to 54 years | 35,013 | 12,454,866 | 0.3% | 56% | 49% | 7% |
| 55 to 59 years | 4,393 | 2,937,481 | 0.1% | 15% | 28% | (13%) |
| 60 to 64 years | (1,844) | 189,280 | (1.0%) | (6%) | 2% | (8%) |
| 65 to 74 years | (1,342) | 284,428 | (0.5%) | (2%) | 2% | (4%) |
| 75 to 84 years | 4,399 | 2,306,072 | 0.2% | 13% | 23% | (10%) |
| 85 years and over | 2,743 | 1,159,422 | 0.2% | 21% | 38% | (17%) |
| | | | | | | |
| Under Age 15 | (3,718) | 6,685,504 | (0.1%) | (2%) | 12% | (14%) |
| Age 15-24 | 17,426 | 2,409,564 | 0.7% | 18% | 7% | 11% |
| Age 25-34 | (18,400) | (3,284,208) | (0.6%) | (17%) | (8%) | (9%) |
| Age 35-44 | 20,170 | 7,569,624 | 0.3% | 21% | 20% | 1% |
| Age 45-54 | 35,013 | 12,454,866 | 0.3% | 56% | 49% | 7% |
| Age 55-64 | 2,549 | 3,126,761 | 0.1% | 4% | 15% | (11%) |
| Age 65-74 | (1,342) | 284,428 | (0.5%) | (2%) | 2% | (4%) |
| Age 75-84 | 4,399 | 2,306,072 | 0.2% | 13% | 23% | (10%) |
| Age 85+ | 2,743 | 1,159,422 | 0.2% | 21% | 38% | (17%) |
| | | | | | | |
| Under Age 55 | 50,491 | 25,835,350 | 0.2% | 9% | 13% | (4%) |
| Age 55+ | 8,349 | 6,876,683 | 0.1% | 5% | 13% | (8%) |
| Age 65+ | 5,800 | 3,749,922 | 0.2% | 6% | 12% | (6%) |
| Age 75+ | 7,142 | 3,465,494 | 0.2% | 15% | 26% | (11%) |
| Age 85+ | 2,743 | 1,159,422 | 0.2% | 21% | 38% | (17%) |
| | | | | | | |
| | Percent of Total |
| | 2000 | 1990 |
| | South Dakota | National | Difference | South Dakota | National | Difference |
| Households | | | | | | |
| Age 65+ | 25% | 23% | 2% | 27% | 24% | 3% |
| Alone | 11% | 9% | 2% | 12% | 10% | 2% |
| Not Alone | 14% | 14% | - | 15% | 14% | 1% |
| | | | | | | |
| Population | | | | | | |
| Under 5 years | 7% | 7% | - | 8% | 7% | 1% |
| 5 to 9 years | 7% | 7% | - | 8% | 7% | 1% |
| 10 to 14 years | 8% | 7% | 1% | 8% | 7% | 1% |
| 15 to 19 years | 8% | 7% | 1% | 7% | 7% | - |
| 20 to 24 years | 7% | 7% | - | 7% | 8% | (1%) |
| 25 to 34 years | 12% | 14% | (2%) | 16% | 17% | (1%) |
| 35 to 44 years | 15% | 16% | (1%) | 14% | 15% | (1%) |
| 45 to 54 years | 13% | 13% | - | 9% | 10% | (1%) |
| 55 to 59 years | 4% | 5% | (1%) | 4% | 4% | - |
| 60 to 64 years | 4% | 4% | - | 4% | 4% | - |
| 65 to 74 years | 7% | 7% | - | 8% | 7% | 1% |
| 75 to 84 years | 5% | 4% | 1% | 5% | 4% | 1% |
| 85 years and over | 2% | 2% | - | 2% | 1% | 1% |
| | | | | | | |
| Under Age 15 | 22% | 21% | 1% | 24% | 22% | 2% |
| Age 15-24 | 15% | 14% | 1% | 14% | 15% | (1%) |
| Age 25-34 | 12% | 14% | (2%) | 16% | 17% | (1%) |
| Age 35-44 | 15% | 16% | (1%) | 14% | 15% | (1%) |
| Age 45-54 | 13% | 13% | - | 9% | 10% | (1%) |
| Age 55-64 | 8% | 9% | (1%) | 9% | 9% | - |
| Age 65-74 | 7% | 7% | - | 8% | 7% | 1% |
| Age 75-84 | 5% | 4% | 1% | 5% | 4% | 1% |
| Age 85+ | 2% | 2% | - | 2% | 1% | 1% |
| | | | | | | |
| Under Age 55 | 77% | 79% | (2%) | 77% | 79% | (2%) |
| Age 55+ | 23% | 21% | 2% | 23% | 21% | 2% |
| Age 65+ | 14% | 12% | 2% | 15% | 13% | 2% |
| Age 75+ | 7% | 6% | 1% | 7% | 5% | 2% |
| Age 85+ | 2% | 2% | - | 2% | 1% | 1% |