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.