The median income of Barnwell County residents was an inflation-adjusted $20,300 per year. Barnwell County had 8,426 households in 2017, with a population of 21,788.
The county with the highest median resident income in the state was Charleston County. Charleston County's median income was $30,777 per year after adjusting for inflation – $10,477 more than Barnwell County. It had 154,049 households in 2017 and a population of 387,847.
Allendale County had the lowest annual resident income among counties in South Carolina, with a median income of only $17,418 per year. That was $2,882 less than the median income in Barnwell County at the time. Allendale County had 3,285 households in 2017 and a population of 9,402.
The table below shows the state's counties ranked by median annual resident earnings in 2017.
| Rank | County | Earnings per resident ($$$) |
|---|---|---|
| 1 | Charleston County | 30,777 |
| 2 | Lexington County | 30,484 |
| 3 | York County | 30,376 |
| 4 | Dorchester County | 30,272 |
| 5 | Beaufort County | 29,554 |
| 6 | Berkeley County | 28,728 |
| 7 | Greenville County | 27,373 |
| 8 | Kershaw County | 26,560 |
| 9 | Lancaster County | 26,167 |
| 10 | Richland County | 26,035 |
| 11 | Aiken County | 25,688 |
| 12 | Anderson County | 24,654 |
| 13 | Calhoun County | 24,499 |
| 14 | Spartanburg County | 24,442 |
| 15 | Horry County | 23,760 |
| 16 | Florence County | 23,693 |
| 17 | Newberry County | 23,654 |
| 18 | Georgetown County | 23,168 |
| 19 | Sumter County | 22,622 |
| 20 | Oconee County | 22,361 |
| 21 | Colleton County | 22,325 |
| 22 | Edgefield County | 22,218 |
| 23 | Greenwood County | 21,909 |
| 24 | Jasper County | 21,770 |
| 25 | Saluda County | 21,765 |
| 26 | Union County | 21,548 |
| 27 | Pickens County | 21,429 |
| 28 | Cherokee County | 21,214 |
| 29 | Hampton County | 21,130 |
| 30 | Chesterfield County | 21,042 |
| 31 | Chester County | 20,918 |
| 32 | McCormick County | 20,779 |
| 33 | Darlington County | 20,682 |
| 34 | Bamberg County | 20,637 |
| 35 | Fairfield County | 20,623 |
| 36 | Laurens County | 20,514 |
| 37 | Barnwell County | 20,300 |
| 38 | Orangeburg County | 20,212 |
| 39 | Clarendon County | 19,768 |
| 40 | Abbeville County | 19,194 |
| 41 | Marlboro County | 18,630 |
| 42 | Marion County | 18,452 |
| 43 | Lee County | 18,283 |
| 44 | Dillon County | 18,082 |
| 45 | Williamsburg County | 17,561 |
| 46 | Allendale County | 17,418 |
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