| North 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 | ||||
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Male
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Female
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| Number | Percent | Number | Percent | |
| Total Population | 320,524 | 49.9% | 321,676 | 50.1% |
| 0-4 | 20,185 | 3.1% | 19,215 | 3.0% |
| 5-9 | 21,997 | 3.4% | 20,985 | 3.3% |
| 10-14 | 24,499 | 3.8% | 22,965 | 3.6% |
| 15-19 | 27,760 | 4.3% | 25,858 | 4.0% |
| 20-24 | 26,831 | 4.2% | 23,672 | 3.7% |
| 25-29 | 20,268 | 3.2% | 18,524 | 2.9% |
| 30-34 | 19,534 | 3.0% | 18,561 | 2.9% |
| 35-39 | 23,668 | 3.7% | 23,323 | 3.6% |
| 40-44 | 25,577 | 4.0% | 25,436 | 4.0% |
| 45-49 | 24,351 | 3.8% | 23,085 | 3.6% |
| 50-54 | 19,523 | 3.0% | 18,472 | 2.9% |
| 55-59 | 14,599 | 2.3% | 14,327 | 2.2% |
| 60-64 | 11,851 | 1.8% | 12,656 | 2.0% |
| 65-69 | 10,861 | 1.7% | 12,281 | 1.9% |
| 70-74 | 10,473 | 1.6% | 12,286 | 1.9% |
| 75-79 | 8,265 | 1.3% | 10,820 | 1.7% |
| 80-84 | 5,715 | 0.9% | 9,051 | 1.4% |
| 85 | 4,567 | 0.7% | 10,159 | 1.6% |
| Age Distribution by Sex, 1990 | ||||
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Male
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Female
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| Number | Percent | Number | Percent | |
| Total Population | 318,201 | 49.8% | 320,599 | 50.2% |
| 0-4 | 24,413 | 3.8% | 23,432 | 3.7% |
| 5-9 | 26,724 | 4.2% | 25,308 | 4.0% |
| 10-14 | 25,165 | 3.9% | 23,655 | 3.7% |
| 15-19 | 24,368 | 3.8% | 22,300 | 3.5% |
| 20-24 | 25,187 | 3.9% | 22,686 | 3.6% |
| 25-29 | 25,613 | 4.0% | 24,541 | 3.8% |
| 30-34 | 27,065 | 4.2% | 26,796 | 4.2% |
| 35-39 | 25,869 | 4.0% | 24,264 | 3.8% |
| 40-44 | 20,619 | 3.2% | 19,268 | 3.0% |
| 45-49 | 15,520 | 2.4% | 15,115 | 2.4% |
| 50-54 | 12,960 | 2.0% | 13,489 | 2.1% |
| 55-59 | 12,704 | 2.0% | 13,564 | 2.1% |
| 60-64 | 13,225 | 2.1% | 13,895 | 2.2% |
| 65-69 | 11,917 | 1.9% | 13,033 | 2.0% |
| 70-74 | 10,216 | 1.6% | 12,375 | 1.9% |
| 75-79 | 7,976 | 1.2% | 11,014 | 1.7% |
| 80-84 | 5,055 | 0.8% | 8,229 | 1.3% |
| 85 | 3,605 | 0.6% | 7,635 | 1.2% |
Source: Census 2000 analyzed by the Social Science Data Analysis Network (SSDAN).