| Idaho |  |
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 | 648,660 | 50.1% | 645,293 | 49.9% |
| 0-4 | 50,047 | 3.9% | 47,596 | 3.7% |
| 5-9 | 51,860 | 4.0% | 48,896 | 3.8% |
| 10-14 | 53,697 | 4.1% | 50,911 | 3.9% |
| 15-19 | 56,131 | 4.3% | 54,727 | 4.2% |
| 20-24 | 48,934 | 3.8% | 45,060 | 3.5% |
| 25-29 | 44,117 | 3.4% | 41,011 | 3.2% |
| 30-34 | 43,111 | 3.3% | 41,194 | 3.2% |
| 35-39 | 47,940 | 3.7% | 46,973 | 3.6% |
| 40-44 | 49,149 | 3.8% | 48,906 | 3.8% |
| 45-49 | 46,290 | 3.6% | 45,882 | 3.5% |
| 50-54 | 39,499 | 3.1% | 38,577 | 3.0% |
| 55-59 | 29,949 | 2.3% | 30,075 | 2.3% |
| 60-64 | 23,775 | 1.8% | 23,730 | 1.8% |
| 65-69 | 19,462 | 1.5% | 20,707 | 1.6% |
| 70-74 | 16,768 | 1.3% | 19,033 | 1.5% |
| 75-79 | 13,280 | 1.0% | 17,163 | 1.3% |
| 80-84 | 8,670 | 0.7% | 12,776 | 1.0% |
| 85 | 5,981 | 0.5% | 12,076 | 0.9% |
| Age Distribution by Sex, 1990 | ||||
|
Male
|
Female
|
|||
| Number | Percent | Number | Percent | |
| Total Population | 500,956 | 49.8% | 505,793 | 50.2% |
| 0-4 | 41,082 | 4.1% | 39,111 | 3.9% |
| 5-9 | 46,183 | 4.6% | 43,860 | 4.4% |
| 10-14 | 46,328 | 4.6% | 43,858 | 4.4% |
| 15-19 | 40,845 | 4.1% | 39,593 | 3.9% |
| 20-24 | 34,083 | 3.4% | 31,709 | 3.1% |
| 25-29 | 36,247 | 3.6% | 35,820 | 3.6% |
| 30-34 | 40,257 | 4.0% | 40,476 | 4.0% |
| 35-39 | 40,123 | 4.0% | 39,771 | 4.0% |
| 40-44 | 35,254 | 3.5% | 34,020 | 3.4% |
| 45-49 | 27,547 | 2.7% | 27,000 | 2.7% |
| 50-54 | 22,309 | 2.2% | 22,051 | 2.2% |
| 55-59 | 19,292 | 1.9% | 20,115 | 2.0% |
| 60-64 | 18,626 | 1.9% | 19,924 | 2.0% |
| 65-69 | 17,854 | 1.8% | 20,132 | 2.0% |
| 70-74 | 14,461 | 1.4% | 17,308 | 1.7% |
| 75-79 | 10,692 | 1.1% | 13,837 | 1.4% |
| 80-84 | 6,144 | 0.6% | 9,439 | 0.9% |
| 85 | 3,629 | 0.4% | 7,769 | 0.8% |
Source: Census 2000 analyzed by the Social Science Data Analysis Network (SSDAN).