The median income of Middlesex County residents was an inflation-adjusted $41,411 per year. Middlesex County had 593,784 households in 2017, with a population of 1,582,857.
The county with the highest median resident income in the state was Norfolk County. Norfolk County's median income was $42,889 per year after adjusting for inflation – $1,478 more than Middlesex County. It had 262,324 households in 2017 and a population of 694,389.
Hampshire County had the lowest annual resident income among counties in Massachusetts, with a median income of only $25,761 per year. That was $15,650 less than the median income in Middlesex County at the time. Hampshire County had 58,782 households in 2017 and a population of 161,197.
The table below shows the state's counties ranked by median annual resident earnings in 2017.
| Rank | County | Earnings per resident ($$$) |
|---|---|---|
| 1 | Norfolk County | 42,889 |
| 2 | Middlesex County | 41,411 |
| 3 | Nantucket County | 41,025 |
| 4 | Dukes County | 36,867 |
| 5 | Plymouth County | 36,001 |
| 6 | Essex County | 33,114 |
| 7 | Barnstable County | 32,506 |
| 8 | Worcester County | 32,473 |
| 9 | Suffolk County | 30,828 |
| 10 | Bristol County | 30,386 |
| 11 | Franklin County | 30,097 |
| 12 | Berkshire County | 28,569 |
| 13 | Hampden County | 26,427 |
| 14 | Hampshire County | 25,761 |
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