| |
| Age Group | Male | Female | Madison County, Idaho, 2010, Universe: 001 Total population Universe Population: 37,536 | ||
| Population | Pct | Population | Pct |  | |
| Total | 18,186 | 48.4 | 19,350 | 51.6 | |
| 0- 4 | 1,904 | 5.1 | 1,690 | 4.5 | |
| 5- 9 | 1,229 | 3.3 | 1,246 | 3.3 | |
| 10-14 | 1,218 | 3.2 | 1,122 | 3.0 | |
| 15-19 | 1,653 | 4.4 | 3,183 | 8.5 | |
| 20-24 | 4,752 | 12.7 | 5,410 | 14.4 | |
| 25-29 | 2,349 | 6.3 | 1,389 | 3.7 | |
| 30-34 | 844 | 2.2 | 755 | 2.0 | |
| 35-39 | 634 | 1.7 | 672 | 1.8 | |
| 40-44 | 536 | 1.4 | 568 | 1.5 | |
| 45-49 | 616 | 1.6 | 615 | 1.6 | |
| 50-54 | 577 | 1.5 | 652 | 1.7 | |
| 55-59 | 537 | 1.4 | 491 | 1.3 | |
| 60-64 | 389 | 1.0 | 413 | 1.1 | |
| 65-69 | 310 | 0.8 | 326 | 0.9 | |
| 70-74 | 237 | 0.6 | 270 | 0.7 | |
| 75-79 | 172 | 0.5 | 198 | 0.5 | |
| 80-84 | 124 | 0.3 | 174 | 0.5 | |
| 85+ | 105 | 0.3 | 176 | 0.5 | |