| |
| Age Group | Male | Female | Illinois, 2010, Universe: 001 Total population Universe Population: 12,830,632 | ||
| Population | Pct | Population | Pct |  | |
| Total | 6,292,276 | 49.0 | 6,538,356 | 51.0 | |
| 0- 4 | 425,893 | 3.3 | 409,684 | 3.2 | |
| 5- 9 | 438,556 | 3.4 | 420,849 | 3.3 | |
| 10-14 | 449,160 | 3.5 | 430,288 | 3.4 | |
| 15-19 | 473,736 | 3.7 | 448,356 | 3.5 | |
| 20-24 | 447,513 | 3.5 | 431,451 | 3.4 | |
| 25-29 | 456,887 | 3.6 | 453,386 | 3.5 | |
| 30-34 | 433,782 | 3.4 | 431,902 | 3.4 | |
| 35-39 | 426,476 | 3.3 | 429,314 | 3.3 | |
| 40-44 | 432,756 | 3.4 | 437,344 | 3.4 | |
| 45-49 | 463,423 | 3.6 | 476,671 | 3.7 | |
| 50-54 | 455,953 | 3.6 | 474,832 | 3.7 | |
| 55-59 | 392,322 | 3.1 | 415,456 | 3.2 | |
| 60-64 | 318,903 | 2.5 | 346,526 | 2.7 | |
| 65-69 | 225,894 | 1.8 | 259,166 | 2.0 | |
| 70-74 | 163,405 | 1.3 | 201,070 | 1.6 | |
| 75-79 | 122,706 | 1.0 | 166,679 | 1.3 | |
| 80-84 | 92,019 | 0.7 | 143,362 | 1.1 | |
| 85+ | 72,892 | 0.6 | 162,020 | 1.3 | |