The median income of Marion County residents was $30,501 per year, adjusted for inflation. It had 13,314 households with a population of 33,207.
The county with the highest median resident income in the state was Dallas County with $44,820 per year after adjusting for inflation – $14,319 more than Marion County. It had 32,886 households with a population of 84,002.
The county with the lowest median resident income in the state was Decatur County with $21,354 per year after adjusting for inflation – $9,147 less than Marion County. It had 3,213 households with a population of 8,044.
Iowa counties by earnings per resident (2018)
| Rank | County | Earnings per resident |
|---|---|---|
| 1 | Dallas County | $44,820 |
| 2 | Warren County | $37,429 |
| 3 | Grundy County | $35,671 |
| 4 | Plymouth County | $35,080 |
| 5 | Cedar County | $34,827 |
| 6 | Polk County | $34,736 |
| 7 | Linn County | $34,045 |
| 8 | Madison County | $33,494 |
| 9 | Benton County | $33,427 |
| 10 | Boone County | $32,948 |
| 11 | Dickinson County | $32,283 |
| 12 | Washington County | $32,265 |
| 13 | Mills County | $32,244 |
| 14 | Iowa County | $32,131 |
| 15 | Bremer County | $31,976 |
| 16 | Lyon County | $31,921 |
| 17 | Harrison County | $31,700 |
| 18 | Ida County | $31,694 |
| 19 | Scott County | $31,552 |
| 20 | Buchanan County | $31,484 |
| 21 | Howard County | $31,482 |
| 22 | Hancock County | $31,390 |
| 23 | Pottawattamie County | $31,387 |
| 24 | Kossuth County | $31,326 |
| 25 | Hamilton County | $31,322 |
| 26 | Delaware County | $31,316 |
| 27 | Chickasaw County | $31,205 |
| 28 | Jackson County | $31,171 |
| 29 | Carroll County | $31,137 |
| 30 | Shelby County | $31,104 |
| 31 | Sac County | $31,081 |
| 32 | Muscatine County | $31,017 |
| 33 | Adair County | $30,913 |
| 33 | Monroe County | $30,913 |
| 35 | Fremont County | $30,769 |
| 36 | Butler County | $30,706 |
| 37 | Guthrie County | $30,675 |
| 38 | Dubuque County | $30,579 |
| 39 | Jones County | $30,550 |
| 40 | Marion County | $30,501 |
| 41 | Cerro Gordo County | $30,297 |
| 42 | Tama County | $30,224 |
| 43 | Winnebago County | $30,208 |
| 44 | Johnson County | $30,153 |
| 45 | Worth County | $30,111 |
| 46 | Osceola County | $30,054 |
| 47 | Cherokee County | $30,047 |
| 48 | O'Brien County | $30,041 |
| 49 | Humboldt County | $29,958 |
| 50 | Davis County | $29,754 |
| 51 | Mitchell County | $29,738 |
| 52 | Clarke County | $29,722 |
| 53 | Palo Alto County | $29,697 |
| 54 | Sioux County | $29,671 |
| 55 | Hardin County | $29,574 |
| 56 | Jasper County | $29,558 |
| 57 | Crawford County | $29,489 |
| 58 | Franklin County | $29,423 |
| 59 | Marshall County | $29,321 |
| 60 | Clinton County | $29,142 |
| 61 | Pocahontas County | $28,762 |
| 62 | Lucas County | $28,741 |
| 63 | Winneshiek County | $28,714 |
| 64 | Woodbury County | $28,597 |
| 65 | Buena Vista County | $28,553 |
| 66 | Wright County | $28,532 |
| 67 | Des Moines County | $28,430 |
| 68 | Louisa County | $28,424 |
| 69 | Clayton County | $28,407 |
| 70 | Allamakee County | $28,364 |
| 71 | Greene County | $28,309 |
| 72 | Adams County | $28,261 |
| 73 | Keokuk County | $28,143 |
| 74 | Poweshiek County | $27,981 |
| 75 | Henry County | $27,780 |
| 76 | Ringgold County | $27,728 |
| 77 | Taylor County | $27,724 |
| 78 | Cass County | $27,687 |
| 79 | Clay County | $27,606 |
| 80 | Audubon County | $27,423 |
| 81 | Montgomery County | $27,264 |
| 82 | Black Hawk County | $27,158 |
| 83 | Floyd County | $26,985 |
| 84 | Mahaska County | $26,790 |
| 85 | Page County | $26,758 |
| 86 | Union County | $26,563 |
| 87 | Fayette County | $26,495 |
| 88 | Calhoun County | $26,431 |
| 89 | Wayne County | $26,271 |
| 90 | Wapello County | $26,066 |
| 91 | Emmet County | $26,009 |
| 92 | Lee County | $25,954 |
| 93 | Van Buren County | $25,625 |
| 94 | Monona County | $25,586 |
| 95 | Webster County | $24,593 |
| 96 | Appanoose County | $23,520 |
| 97 | Jefferson County | $22,747 |
| 98 | Story County | $22,163 |
| 99 | Decatur County | $21,354 |
* All values are inflation-adjusted
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