The median income of Trego County residents was an inflation-adjusted $32,098 per year. Trego County had 1,389 households in 2017, with a population of 2,899.
The county with the highest median resident income in the state was Johnson County. Johnson County's median income was $40,199 per year after adjusting for inflation – $8,101 more than Trego County. It had 224,248 households in 2017 and a population of 578,797.
Crawford County had the lowest annual resident income among counties in Kansas, with a median income of only $20,585 per year. That was $11,513 less than the median income in Trego County at the time. Crawford County had 14,974 households in 2017 and a population of 39,099.
The table below shows the top 100 counties ranked by median annual resident earnings in 2017.
| Rank | County | Earnings per resident ($$$) |
|---|---|---|
| 1 | Johnson County | 40,199 |
| 2 | Scott County | 36,518 |
| 3 | Miami County | 32,351 |
| 4 | Pottawatomie County | 32,347 |
| 5 | Gray County | 32,291 |
| 6 | Trego County | 32,098 |
| 7 | Jefferson County | 32,078 |
| 8 | Leavenworth County | 31,682 |
| 9 | Edwards County | 31,369 |
| 10 | Sheridan County | 31,284 |
| 11 | Grant County | 31,250 |
| 12 | Clark County | 31,235 |
| 13 | Butler County | 30,886 |
| 14 | Wabaunsee County | 30,670 |
| 15 | Stevens County | 30,438 |
| 16 | Shawnee County | 30,244 |
| 17 | McPherson County | 29,864 |
| 18 | Franklin County | 29,490 |
| 19 | Hodgeman County | 29,476 |
| 20 | Ottawa County | 29,419 |
| 21 | Jackson County | 29,219 |
| 22 | Kingman County | 29,129 |
| 23 | Sedgwick County | 28,903 |
| 24 | Meade County | 28,671 |
| 25 | Logan County | 28,653 |
| 26 | Marshall County | 28,085 |
| 27 | Coffey County | 28,056 |
| 28 | Geary County | 27,915 |
| 29 | Comanche County | 27,862 |
| 30 | Osage County | 27,742 |
| 31 | Pratt County | 27,570 |
| 32 | Lane County | 27,533 |
| 33 | Wallace County | 27,500 |
| 34 | Nemaha County | 27,463 |
| 35 | Sumner County | 27,443 |
| 36 | Linn County | 27,424 |
| 37 | Washington County | 27,389 |
| 38 | Finney County | 27,362 |
| 39 | Saline County | 27,304 |
| 40 | Ford County | 27,246 |
| 41 | Harvey County | 27,146 |
| 42 | Gove County | 27,080 |
| 43 | Greeley County | 27,070 |
| 44 | Ness County | 27,018 |
| 45 | Chase County | 26,980 |
| 46 | Haskell County | 26,955 |
| 47 | Thomas County | 26,940 |
| 48 | Morris County | 26,914 |
| 49 | Wichita County | 26,806 |
| 50 | Dickinson County | 26,743 |
| 51 | Sherman County | 26,741 |
| 52 | Clay County | 26,682 |
| 53 | Harper County | 26,674 |
| 54 | Barber County | 26,623 |
| 55 | Hamilton County | 26,396 |
| 56 | Cheyenne County | 26,392 |
| 57 | Pawnee County | 26,340 |
| 58 | Republic County | 26,326 |
| 59 | Kearny County | 26,308 |
| 60 | Mitchell County | 26,256 |
| 61 | Kiowa County | 26,036 |
| 62 | Stafford County | 26,034 |
| 63 | Phillips County | 25,905 |
| 64 | Barton County | 25,809 |
| 65 | Ellsworth County | 25,739 |
| 66 | Osborne County | 25,625 |
| 67 | Lincoln County | 25,618 |
| 68 | Norton County | 25,578 |
| 69 | Brown County | 25,550 |
| 70 | Rooks County | 25,526 |
| 71 | Seward County | 25,523 |
| 72 | Rawlins County | 25,381 |
| 73 | Rush County | 25,240 |
| 74 | Reno County | 25,220 |
| 75 | Doniphan County | 25,159 |
| 76 | Rice County | 25,143 |
| 77 | Russell County | 24,992 |
| 78 | Decatur County | 24,930 |
| 79 | Neosho County | 24,821 |
| 80 | Stanton County | 24,783 |
| 81 | Ellis County | 24,774 |
| 82 | Smith County | 24,759 |
| 83 | Cloud County | 24,759 |
| 84 | Graham County | 24,731 |
| 85 | Douglas County | 24,640 |
| 86 | Morton County | 24,617 |
| 87 | Allen County | 24,547 |
| 88 | Wyandotte County | 24,456 |
| 89 | Lyon County | 24,376 |
| 90 | Cowley County | 24,207 |
| 91 | Marion County | 24,170 |
| 92 | Greenwood County | 23,881 |
| 93 | Labette County | 23,879 |
| 94 | Montgomery County | 23,592 |
| 95 | Cherokee County | 23,556 |
| 96 | Anderson County | 23,133 |
| 97 | Jewell County | 22,755 |
| 98 | Wilson County | 22,713 |
| 99 | Riley County | 22,548 |
| 100 | Chautauqua County | 22,307 |
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