The median income of Martin County residents was an inflation-adjusted $27,594 per year. Martin County had 63,497 households in 2017, with a population of 155,719.
The county with the highest median resident income in the state was St. Johns County. St. Johns County's median income was $33,827 per year after adjusting for inflation – $6,233 more than Martin County. It had 83,744 households in 2017 and a population of 226,578.
Madison County had the lowest annual resident income among counties in Florida, with a median income of only $18,832 per year. That was $8,762 less than the median income in Martin County at the time. Madison County had 6,743 households in 2017 and a population of 18,518.
The table below shows the state's counties ranked by median annual resident earnings in 2017.
| Rank | County | Earnings per resident ($$$) |
|---|---|---|
| 1 | St. Johns County | 33,827 |
| 2 | Monroe County | 31,636 |
| 3 | Clay County | 30,704 |
| 4 | Wakulla County | 30,574 |
| 5 | Seminole County | 30,431 |
| 6 | Nassau County | 30,425 |
| 7 | Okaloosa County | 29,815 |
| 8 | Sarasota County | 29,337 |
| 9 | Collier County | 29,016 |
| 10 | Santa Rosa County | 28,940 |
| 11 | Duval County | 28,493 |
| 12 | Palm Beach County | 28,273 |
| 13 | Hillsborough County | 27,767 |
| 14 | Broward County | 27,702 |
| 15 | Pinellas County | 27,619 |
| 16 | Martin County | 27,594 |
| 17 | Jefferson County | 27,210 |
| 18 | Manatee County | 26,990 |
| 19 | Leon County | 26,652 |
| 20 | Walton County | 26,265 |
| 21 | Brevard County | 26,236 |
| 22 | Lee County | 26,138 |
| 23 | Orange County | 26,056 |
| 24 | Baker County | 25,914 |
| 25 | Sumter County | 25,762 |
| 26 | Pasco County | 25,443 |
| 27 | Indian River County | 25,371 |
| 28 | Bay County | 25,361 |
| 29 | Escambia County | 25,332 |
| 30 | Lake County | 25,101 |
| 31 | Flagler County | 24,772 |
| 32 | Bradford County | 24,748 |
| 33 | Polk County | 24,479 |
| 34 | Volusia County | 24,441 |
| 35 | St. Lucie County | 24,348 |
| 36 | Charlotte County | 24,318 |
| 37 | Columbia County | 23,914 |
| 38 | Gadsden County | 23,713 |
| 39 | Alachua County | 23,711 |
| 40 | Franklin County | 22,980 |
| 41 | Hernando County | 22,825 |
| 42 | Marion County | 22,821 |
| 43 | Gilchrist County | 22,694 |
| 44 | Lafayette County | 22,672 |
| 45 | Gulf County | 22,668 |
| 46 | Citrus County | 22,221 |
| 47 | Osceola County | 21,967 |
| 48 | Liberty County | 21,941 |
| 49 | Suwannee County | 21,723 |
| 50 | Okeechobee County | 21,598 |
| 51 | Jackson County | 21,578 |
| 52 | Hardee County | 21,437 |
| 53 | Calhoun County | 21,293 |
| 54 | Washington County | 20,988 |
| 55 | Holmes County | 20,650 |
| 56 | Union County | 20,648 |
| 57 | Levy County | 20,618 |
| 58 | DeSoto County | 20,413 |
| 59 | Taylor County | 20,338 |
| 60 | Dixie County | 20,211 |
| 61 | Highlands County | 20,068 |
| 62 | Glades County | 20,022 |
| 63 | Hamilton County | 20,007 |
| 64 | Hendry County | 19,943 |
| 65 | Putnam County | 19,665 |
| 66 | Madison County | 18,832 |
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