| South Dakota |  |
AGE DISTRIBUTION
Drawn as a "population pyramid," an area's age-sex structure hints at its patterns of growth. A top heavy pyramid, like the one for Grant County, North Dakota , suggests negative population growth that might be due to any number of factors, including high death rates, low birth rates, and increased emigration from the area. A bottom heavy pyramid, like the one drawn for Orange County, Florida , suggests high birthrates, falling or stable death rates, and the potential for rapid population growth. Most areas, however, fall somewhere between these two extremes and have a population pyramid that resembles a square, indicating slow and sustained growth with the birth rate exceeding the death rate, though not by a great margin.
| Age Distribution by Sex, 2000 | ||||
|
Male
|
Female
|
|||
| Number | Percent | Number | Percent | |
| Total Population | 374,558 | 49.6% | 380,286 | 50.4% |
| 0-4 | 26,142 | 3.5% | 24,927 | 3.3% |
| 5-9 | 28,019 | 3.7% | 26,467 | 3.5% |
| 10-14 | 30,495 | 4.0% | 28,968 | 3.8% |
| 15-19 | 32,177 | 4.3% | 30,286 | 4.0% |
| 20-24 | 27,096 | 3.6% | 25,706 | 3.4% |
| 25-29 | 23,010 | 3.0% | 22,074 | 2.9% |
| 30-34 | 23,457 | 3.1% | 22,472 | 3.0% |
| 35-39 | 28,445 | 3.8% | 28,142 | 3.7% |
| 40-44 | 29,648 | 3.9% | 29,151 | 3.9% |
| 45-49 | 27,407 | 3.6% | 26,458 | 3.5% |
| 50-54 | 22,436 | 3.0% | 21,381 | 2.8% |
| 55-59 | 16,674 | 2.2% | 16,937 | 2.2% |
| 60-64 | 13,937 | 1.8% | 14,801 | 2.0% |
| 65-69 | 12,625 | 1.7% | 14,501 | 1.9% |
| 70-74 | 12,005 | 1.6% | 13,998 | 1.9% |
| 75-79 | 9,913 | 1.3% | 12,607 | 1.7% |
| 80-84 | 6,336 | 0.8% | 10,060 | 1.3% |
| 85 | 4,736 | 0.6% | 11,350 | 1.5% |
| Age Distribution by Sex, 1990 | ||||
|
Male
|
Female
|
|||
| Number | Percent | Number | Percent | |
| Total Population | 342,498 | 49.2% | 353,506 | 50.8% |
| 0-4 | 27,947 | 4.0% | 26,557 | 3.8% |
| 5-9 | 30,061 | 4.3% | 28,734 | 4.1% |
| 10-14 | 28,249 | 4.1% | 27,188 | 3.9% |
| 15-19 | 25,583 | 3.7% | 24,988 | 3.6% |
| 20-24 | 24,171 | 3.5% | 23,097 | 3.3% |
| 25-29 | 26,748 | 3.8% | 26,395 | 3.8% |
| 30-34 | 28,250 | 4.1% | 28,020 | 4.0% |
| 35-39 | 26,797 | 3.9% | 25,729 | 3.7% |
| 40-44 | 21,861 | 3.1% | 20,829 | 3.0% |
| 45-49 | 16,856 | 2.4% | 16,671 | 2.4% |
| 50-54 | 14,197 | 2.0% | 14,945 | 2.1% |
| 55-59 | 14,033 | 2.0% | 15,185 | 2.2% |
| 60-64 | 14,848 | 2.1% | 15,734 | 2.3% |
| 65-69 | 14,197 | 2.0% | 15,269 | 2.2% |
| 70-74 | 11,162 | 1.6% | 13,843 | 2.0% |
| 75-79 | 8,398 | 1.2% | 11,909 | 1.7% |
| 80-84 | 5,192 | 0.7% | 9,018 | 1.3% |
| 85 | 3,948 | 0.6% | 9,395 | 1.3% |
Source: Census 2000 analyzed by the Social Science Data Analysis Network (SSDAN).