| Illinois |  |
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 | 6,080,336 | 49.0% | 6,338,957 | 51.0% |
| 0-4 | 447,922 | 3.6% | 428,627 | 3.5% |
| 5-9 | 476,180 | 3.8% | 453,678 | 3.7% |
| 10-14 | 462,915 | 3.7% | 442,182 | 3.6% |
| 15-19 | 462,538 | 3.7% | 431,464 | 3.5% |
| 20-24 | 434,984 | 3.5% | 415,859 | 3.3% |
| 25-29 | 451,178 | 3.6% | 440,581 | 3.5% |
| 30-34 | 463,257 | 3.7% | 456,658 | 3.7% |
| 35-39 | 496,442 | 4.0% | 500,444 | 4.0% |
| 40-44 | 488,627 | 3.9% | 498,357 | 4.0% |
| 45-49 | 430,143 | 3.5% | 443,669 | 3.6% |
| 50-54 | 367,435 | 3.0% | 385,495 | 3.1% |
| 55-59 | 278,223 | 2.2% | 299,524 | 2.4% |
| 60-64 | 218,881 | 1.8% | 244,005 | 2.0% |
| 65-69 | 180,927 | 1.5% | 216,516 | 1.7% |
| 70-74 | 162,794 | 1.3% | 212,010 | 1.7% |
| 75-79 | 127,172 | 1.0% | 189,776 | 1.5% |
| 80-84 | 77,733 | 0.6% | 141,066 | 1.1% |
| 85 | 52,985 | 0.4% | 139,046 | 1.1% |
| 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 | 5,552,233 | 48.6% | 5,878,369 | 51.4% |
| 0-4 | 433,375 | 3.8% | 414,766 | 3.6% |
| 5-9 | 428,589 | 3.7% | 408,030 | 3.6% |
| 10-14 | 407,375 | 3.6% | 389,093 | 3.4% |
| 15-19 | 423,448 | 3.7% | 394,553 | 3.5% |
| 20-24 | 436,863 | 3.8% | 423,224 | 3.7% |
| 25-29 | 491,782 | 4.3% | 492,308 | 4.3% |
| 30-34 | 500,547 | 4.4% | 508,548 | 4.4% |
| 35-39 | 448,388 | 3.9% | 458,541 | 4.0% |
| 40-44 | 389,404 | 3.4% | 403,811 | 3.5% |
| 45-49 | 310,205 | 2.7% | 326,282 | 2.9% |
| 50-54 | 256,972 | 2.2% | 273,268 | 2.4% |
| 55-59 | 232,646 | 2.0% | 252,935 | 2.2% |
| 60-64 | 229,466 | 2.0% | 259,638 | 2.3% |
| 65-69 | 203,026 | 1.8% | 252,726 | 2.2% |
| 70-74 | 152,295 | 1.3% | 213,893 | 1.9% |
| 75-79 | 108,053 | 0.9% | 176,227 | 1.5% |
| 80-84 | 60,737 | 0.5% | 122,039 | 1.1% |
| 85 | 39,062 | 0.3% | 108,487 | 0.9% |
Source: Census 2000 analyzed by the Social Science Data Analysis Network (SSDAN).