The median income of Harford County residents was $39,840 per year, adjusted for inflation. It had 93,286 households with a population of 251,025.
The county with the highest median resident income in the state was Howard County with $55,253 per year after adjusting for inflation – $15,413 more than Harford County. It had 112,966 households with a population of 315,327.
The county with the lowest median resident income in the state was Somerset County with $21,425 per year after adjusting for inflation – $18,415 less than Harford County. It had 8,383 households with a population of 25,737.
Maryland counties by earnings per resident (2018)
| Rank | County | Earnings per resident |
|---|---|---|
| 1 | Howard County | $55,253 |
| 2 | Montgomery County | $47,511 |
| 3 | Calvert County | $46,726 |
| 4 | Charles County | $46,381 |
| 5 | Anne Arundel County | $43,726 |
| 6 | St. Mary's County | $41,942 |
| 7 | Frederick County | $41,568 |
| 8 | Carroll County | $40,865 |
| 9 | Queen Anne's County | $39,926 |
| 10 | Harford County | $39,840 |
| 11 | Prince George's County | $38,674 |
| 12 | Baltimore County | $37,266 |
| 13 | Cecil County | $34,874 |
| 14 | Talbot County | $34,737 |
| 15 | Worcester County | $30,438 |
| 16 | Washington County | $29,522 |
| 17 | Dorchester County | $28,562 |
| 18 | Caroline County | $28,025 |
| 19 | Kent County | $27,221 |
| 20 | Wicomico County | $27,133 |
| 21 | Garrett County | $25,405 |
| 22 | Allegany County | $22,529 |
| 23 | Somerset County | $21,425 |
* All values are inflation-adjusted
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