| County Name | State | Average Adjusted Gross Income | Rank* | |||||
| Catron County | New Mexico | $13,567 | 1 | |||||
| Hayes County | Nebraska | $16,481 | 2 | |||||
| Buffalo County | South Dakota | $17,889 | 3 | |||||
| Meagher County | Montana | $18,406 | 4 | |||||
| Petroleum County | Montana | $18,410 | 5 | |||||
| Loup County | Nebraska | $18,411 | 6 | |||||
| Issaquena County | Mississippi | $18,620 | 7 | |||||
| Keya Paha County | Nebraska | $18,863 | 8 | |||||
| Zavala County | Texas | $19,146 | 9 | |||||
| Blaine County | Nebraska | $19,249 | 10 | |||||
| Starr County | Texas | $19,803 | 11 | |||||
| Wheatland County | Montana | $19,876 | 12 | |||||
| McPherson County | Nebraska | $20,557 | 13 | |||||
| Todd County | South Dakota | $20,843 | 14 | |||||
| Sherman County | Texas | $20,904 | 15 | |||||
| Hudspeth County | Texas | $21,240 | 16 | |||||
| Ziebach County | South Dakota | $21,435 | 17 | |||||
| Corson County | South Dakota | $21,532 | 18 | |||||
| East Carroll Parish | Louisiana | $21,636 | 19 | |||||
| Wheeler County | Nebraska | $22,057 | 20 | |||||
| Maverick County | Texas | $22,228 | 21 | |||||
| Union County | New Mexico | $22,267 | 22 | |||||
| Shannon County | Missouri | $22,393 | 23 | |||||
| Humphreys County | Mississippi | $22,410 | 24 | |||||
| Noxubee County | Mississippi | $22,422 | 25 | |||||
| Dewey County | South Dakota | $22,467 | 26 | |||||
| Guadalupe County | New Mexico | $22,584 | 27 | |||||
| Holmes County | Mississippi | $22,772 | 28 | |||||
| Jefferson County | Mississippi | $22,795 | 29 | |||||
| Tallahatchie County | Mississippi | $22,807 | 30 | |||||
| Sioux County | North Dakota | $22,815 | 31 | |||||
| Presidio County | Texas | $22,819 | 32 | |||||
| Luna County | New Mexico | $22,876 | 33 | |||||
| Shannon County | South Dakota | $22,960 | 34 | |||||
| Perry County | Alabama | $22,975 | 35 | |||||
| Willacy County | Texas | $23,039 | 36 | |||||
| Mora County | New Mexico | $23,127 | 37 | |||||
| Sharkey County | Mississippi | $23,164 | 38 | |||||
| Greeley County | Nebraska | $23,184 | 39 | |||||
| Searcy County | Arkansas | $23,244 | 40 | |||||
| Harding County | New Mexico | $23,301 | 41 | |||||
| Brooks County | Texas | $23,344 | 42 | |||||
| Reeves County | Texas | $23,361 | 43 | |||||
| McCreary County | Kentucky | $23,384 | 44 | |||||
| Hidalgo County | New Mexico | $23,414 | 45 | |||||
| Culberson County | Texas | $23,544 | 46 | |||||
| Mellette County | South Dakota | $23,591 | 47 | |||||
| Harlan County | Nebraska | $23,617 | 48 | |||||
| Thomas County | Nebraska | $23,682 | 49 | |||||
| Glacier County | Montana | $23,683 | 50 | |||||