| Iowa |  |
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 | 1,435,515 | 49.1% | 1,490,809 | 50.9% |
| 0-4 | 96,723 | 3.3% | 91,690 | 3.1% |
| 5-9 | 103,822 | 3.5% | 98,781 | 3.4% |
| 10-14 | 108,101 | 3.7% | 102,446 | 3.5% |
| 15-19 | 115,776 | 4.0% | 110,644 | 3.8% |
| 20-24 | 103,903 | 3.6% | 99,760 | 3.4% |
| 25-29 | 90,258 | 3.1% | 87,001 | 3.0% |
| 30-34 | 94,579 | 3.2% | 91,222 | 3.1% |
| 35-39 | 108,817 | 3.7% | 109,080 | 3.7% |
| 40-44 | 113,795 | 3.9% | 113,507 | 3.9% |
| 45-49 | 107,360 | 3.7% | 105,303 | 3.6% |
| 50-54 | 90,248 | 3.1% | 89,883 | 3.1% |
| 55-59 | 68,307 | 2.3% | 70,745 | 2.4% |
| 60-64 | 56,829 | 1.9% | 61,531 | 2.1% |
| 65-69 | 49,643 | 1.7% | 57,730 | 2.0% |
| 70-74 | 46,748 | 1.6% | 57,814 | 2.0% |
| 75-79 | 37,868 | 1.3% | 53,637 | 1.8% |
| 80-84 | 24,765 | 0.8% | 42,890 | 1.5% |
| 85 | 17,973 | 0.6% | 47,145 | 1.6% |
| Age Distribution by Sex, 1990 | ||||
|
Male
|
Female
|
|||
| Number | Percent | Number | Percent | |
| Total Population | 1,344,802 | 48.4% | 1,431,953 | 51.6% |
| 0-4 | 98,754 | 3.6% | 94,449 | 3.4% |
| 5-9 | 107,301 | 3.9% | 102,037 | 3.7% |
| 10-14 | 104,787 | 3.8% | 99,430 | 3.6% |
| 15-19 | 101,398 | 3.7% | 98,018 | 3.5% |
| 20-24 | 99,442 | 3.6% | 96,977 | 3.5% |
| 25-29 | 102,258 | 3.7% | 104,358 | 3.8% |
| 30-34 | 110,293 | 4.0% | 111,710 | 4.0% |
| 35-39 | 106,553 | 3.8% | 105,567 | 3.8% |
| 40-44 | 91,436 | 3.3% | 91,765 | 3.3% |
| 45-49 | 72,161 | 2.6% | 73,891 | 2.7% |
| 50-54 | 62,556 | 2.3% | 65,820 | 2.4% |
| 55-59 | 58,589 | 2.1% | 63,746 | 2.3% |
| 60-64 | 60,405 | 2.2% | 66,948 | 2.4% |
| 65-69 | 55,900 | 2.0% | 66,554 | 2.4% |
| 70-74 | 44,744 | 1.6% | 59,763 | 2.2% |
| 75-79 | 33,255 | 1.2% | 51,231 | 1.8% |
| 80-84 | 20,454 | 0.7% | 38,950 | 1.4% |
| 85 | 14,516 | 0.5% | 40,739 | 1.5% |
Source: Census 2000 analyzed by the Social Science Data Analysis Network (SSDAN).