The median income of Butler County residents was an inflation-adjusted $31,982 per year. Butler County had 75,596 households in 2017, with a population of 185,984.
The county with the highest median resident income in the state was Chester County. Chester County's median income was $40,145 per year after adjusting for inflation – $8,163 more than Butler County. It had 188,613 households in 2017 and a population of 514,652.
Forest County had the lowest annual resident income among counties in Pennsylvania, with a median income of only $15,451 per year. That was $16,531 less than the median income in Butler County at the time. Forest County had 1,473 households in 2017 and a population of 7,388.
The table below shows the state's counties ranked by median annual resident earnings in 2017.
| Rank | County | Earnings per resident ($$$) |
|---|---|---|
| 1 | Chester County | 40,145 |
| 2 | Montgomery County | 40,106 |
| 3 | Bucks County | 37,205 |
| 4 | Delaware County | 33,285 |
| 5 | Cumberland County | 33,032 |
| 6 | Butler County | 31,982 |
| 7 | Dauphin County | 31,362 |
| 8 | Perry County | 30,869 |
| 9 | Allegheny County | 30,793 |
| 10 | York County | 30,531 |
| 11 | Franklin County | 30,516 |
| 12 | Northampton County | 30,471 |
| 13 | Washington County | 29,590 |
| 14 | Lancaster County | 29,529 |
| 15 | Lebanon County | 29,382 |
| 16 | Lehigh County | 29,210 |
| 17 | Westmoreland County | 29,134 |
| 18 | Adams County | 29,049 |
| 19 | Beaver County | 28,357 |
| 20 | Berks County | 28,335 |
| 21 | Montour County | 28,011 |
| 22 | Pike County | 27,946 |
| 23 | Elk County | 27,199 |
| 24 | Monroe County | 27,085 |
| 25 | Wyoming County | 26,805 |
| 26 | Fulton County | 26,675 |
| 27 | Bradford County | 26,523 |
| 28 | Schuylkill County | 26,362 |
| 29 | Luzerne County | 26,167 |
| 30 | Susquehanna County | 26,049 |
| 31 | Carbon County | 26,011 |
| 32 | Juniata County | 25,937 |
| 33 | Armstrong County | 25,604 |
| 34 | Lackawanna County | 25,537 |
| 35 | Snyder County | 25,486 |
| 36 | Warren County | 25,126 |
| 37 | Columbia County | 25,121 |
| 38 | Lycoming County | 25,118 |
| 39 | Erie County | 25,010 |
| 40 | Centre County | 24,810 |
| 41 | Lawrence County | 24,788 |
| 42 | Wayne County | 24,785 |
| 43 | Northumberland County | 24,778 |
| 44 | Bedford County | 24,690 |
| 45 | Blair County | 24,519 |
| 46 | Cambria County | 24,477 |
| 47 | Tioga County | 24,400 |
| 48 | Venango County | 24,378 |
| 49 | Jefferson County | 24,358 |
| 50 | Greene County | 24,323 |
| 51 | Crawford County | 24,219 |
| 52 | Mercer County | 24,100 |
| 53 | Cameron County | 24,035 |
| 54 | Philadelphia County | 24,007 |
| 55 | Mifflin County | 23,785 |
| 56 | Huntingdon County | 23,569 |
| 57 | Somerset County | 23,547 |
| 58 | McKean County | 23,389 |
| 59 | Sullivan County | 23,146 |
| 60 | Clarion County | 22,843 |
| 61 | Clinton County | 22,685 |
| 62 | Fayette County | 22,519 |
| 63 | Clearfield County | 22,331 |
| 64 | Potter County | 22,325 |
| 65 | Union County | 22,235 |
| 66 | Indiana County | 22,189 |
| 67 | Forest County | 15,451 |
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