The median income of Kennebec County residents was an inflation-adjusted $26,756 per year. Kennebec County had 51,055 households in 2017, with a population of 121,289.
The county with the highest median resident income in the state was Cumberland County. Cumberland County's median income was $32,098 per year after adjusting for inflation – $5,342 more than Kennebec County. It had 118,807 households in 2017 and a population of 289,173.
Aroostook County had the lowest annual resident income among counties in Maine, with a median income of only $21,284 per year. That was $5,472 less than the median income in Kennebec County at the time. Aroostook County had 29,844 households in 2017 and a population of 68,840.
The table below shows the state's counties ranked by median annual resident earnings in 2017.
| Rank | County | Earnings per resident ($$$) |
|---|---|---|
| 1 | Cumberland County | 32,098 |
| 2 | Sagadahoc County | 31,701 |
| 3 | York County | 30,212 |
| 4 | Lincoln County | 27,218 |
| 5 | Knox County | 27,061 |
| 6 | Kennebec County | 26,756 |
| 7 | Androscoggin County | 26,498 |
| 8 | Hancock County | 26,330 |
| 9 | Waldo County | 25,700 |
| 10 | Penobscot County | 23,501 |
| 11 | Franklin County | 22,896 |
| 12 | Oxford County | 22,294 |
| 13 | Piscataquis County | 21,888 |
| 14 | Somerset County | 21,690 |
| 15 | Washington County | 21,367 |
| 16 | Aroostook County | 21,284 |
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