The median income of Ada County residents was $31,633 per year, adjusted for inflation. It had 168,741 households with a population of 446,052.
The county with the highest median resident income in the state was Teton County with $32,254 per year after adjusting for inflation – $621 more than Ada County. It had 3,736 households with a population of 11,080.
The county with the lowest median resident income in the state was Madison County with $12,016 per year after adjusting for inflation – $19,617 less than Ada County. It had 10,625 households with a population of 38,705.
Idaho counties by earnings per resident (2018)
| Rank | County | Earnings per resident |
|---|---|---|
| 1 | Teton County | $32,254 |
| 2 | Ada County | $31,633 |
| 3 | Blaine County | $30,829 |
| 4 | Boise County | $27,595 |
| 5 | Kootenai County | $27,268 |
| 6 | Nez Perce County | $27,061 |
| 7 | Caribou County | $26,852 |
| 8 | Power County | $26,404 |
| 9 | Valley County | $25,923 |
| 10 | Jefferson County | $25,895 |
| 11 | Bonneville County | $25,881 |
| 12 | Elmore County | $25,658 |
| 13 | Payette County | $25,581 |
| 14 | Boundary County | $25,568 |
| 15 | Cassia County | $25,277 |
| 16 | Minidoka County | $25,230 |
| 17 | Twin Falls County | $25,185 |
| 18 | Adams County | $25,054 |
| 18 | Butte County | $25,054 |
| 20 | Gooding County | $24,955 |
| 21 | Lincoln County | $24,797 |
| 22 | Fremont County | $24,671 |
| 23 | Bonner County | $24,336 |
| 24 | Canyon County | $23,839 |
| 25 | Clearwater County | $23,756 |
| 26 | Jerome County | $23,619 |
| 27 | Bingham County | $23,526 |
| 28 | Franklin County | $23,481 |
| 29 | Bannock County | $23,419 |
| 30 | Lewis County | $23,365 |
| 31 | Bear Lake County | $23,125 |
| 32 | Benewah County | $23,080 |
| 33 | Owyhee County | $22,902 |
| 34 | Oneida County | $22,450 |
| 35 | Lemhi County | $22,316 |
| 36 | Camas County | $22,250 |
| 37 | Shoshone County | $21,982 |
| 38 | Latah County | $21,946 |
| 39 | Washington County | $21,481 |
| 40 | Idaho County | $21,402 |
| 41 | Clark County | $21,111 |
| 42 | Gem County | $21,102 |
| 43 | Custer County | $18,668 |
| 44 | Madison County | $12,016 |
* All values are inflation-adjusted
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