Population Characteristics - Age
(2019)
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| County Name | Under 18
Rank | Under 18 | 18 - 64 | 65 and over | Dependency ratio |
| Jefferson | 1 | 33.7% | 54.8% | 11.6% | 82.6 |
| Cassia | 2 | 31.6% | 54.0% | 14.5% | 85.3 |
| Franklin | 3 | 31.5% | 53.9% | 14.6% | 85.6 |
| Power | 4 | 30.6% | 53.8% | 15.7% | 86.0 |
| Jerome | 5 | 30.5% | 56.3% | 13.2% | 77.7 |
| Bingham | 6 | 30.4% | 55.1% | 14.5% | 81.4 |
| Bonneville | 7 | 30.3% | 56.1% | 13.5% | 78.1 |
| Caribou | 8 | 29.0% | 53.6% | 17.3% | 86.4 |
| Minidoka | 9 | 28.6% | 55.2% | 16.2% | 81.3 |
| Oneida | 10 | 28.3% | 51.2% | 20.4% | 95.2 |
| Canyon | 11 | 27.9% | 58.1% | 14.0% | 72.1 |
| Twin Falls | 12 | 27.4% | 57.0% | 15.6% | 75.6 |
| Lincoln | 13 | 27.4% | 58.5% | 14.1% | 70.9 |
| Bear Lake | 14 | 26.9% | 52.5% | 20.7% | 90.6 |
| Gooding | 15 | 26.9% | 55.3% | 17.9% | 81.0 |
| Madison | 16 | 26.8% | 66.1% | 7.1% | 51.3 |
| Payette | 17 | 25.9% | 55.5% | 18.6% | 80.2 |
| Bannock | 18 | 25.9% | 59.5% | 14.7% | 68.2 |
| Owyhee | 19 | 25.4% | 56.5% | 18.0% | 76.9 |
| Elmore | 20 | 25.3% | 60.6% | 14.1% | 65.0 |
| Fremont | 21 | 24.7% | 57.9% | 17.5% | 72.7 |
| Butte | 22 | 24.3% | 52.1% | 23.6% | 92.1 |
| Teton | 23 | 23.8% | 63.1% | 13.1% | 58.6 |
| Ada | 24 | 23.2% | 61.9% | 14.9% | 61.7 |
| Boundary | 25 | 23.0% | 53.9% | 23.1% | 85.4 |
| Gem | 26 | 22.8% | 55.2% | 22.0% | 81.2 |
| Washington | 27 | 22.6% | 51.5% | 25.9% | 94.4 |
| Kootenai | 28 | 22.6% | 58.0% | 19.4% | 72.6 |
| Benewah | 29 | 22.1% | 55.1% | 22.8% | 81.4 |
| Camas | 30 | 22.1% | 53.5% | 24.4% | 86.8 |
| Clark | 31 | 22.0% | 58.6% | 19.4% | 70.7 |
| Lewis | 32 | 21.7% | 51.5% | 26.9% | 94.2 |
| Nez Perce | 33 | 21.4% | 58.4% | 20.2% | 71.2 |
| Blaine | 34 | 21.1% | 58.6% | 20.3% | 70.8 |
| Shoshone | 35 | 20.5% | 56.4% | 23.1% | 77.3 |
| Bonner | 36 | 19.7% | 54.9% | 25.4% | 82.1 |
| Idaho | 37 | 19.3% | 52.0% | 28.6% | 92.2 |
| Lemhi | 38 | 18.6% | 50.7% | 30.6% | 97.2 |
| Latah | 39 | 18.4% | 67.5% | 14.1% | 48.1 |
| Valley | 40 | 18.3% | 55.8% | 25.9% | 79.3 |
| Adams | 41 | 17.3% | 52.7% | 29.9% | 89.6 |
| Custer | 42 | 17.2% | 52.7% | 30.1% | 89.6 |
| Boise | 43 | 16.3% | 57.4% | 26.3% | 74.3 |
| Clearwater | 44 | 15.8% | 56.2% | 28.0% | 77.9 |
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