The median income of Salt Lake County residents was an inflation-adjusted $30,609 per year. Salt Lake County had 363,058 households in 2017, with a population of 1,106,700.
The county with the highest median resident income in the state was Summit County. Summit County's median income was $40,823 per year after adjusting for inflation – $10,214 more than Salt Lake County. It had 14,781 households in 2017 and a population of 39,731.
Sanpete County had the lowest annual resident income among counties in Utah, with a median income of only $18,247 per year. That was $12,362 less than the median income in Salt Lake County at the time. Sanpete County had 8,366 households in 2017 and a population of 28,892.
The table below shows the state's counties ranked by median annual resident earnings in 2017.
| Rank | County | Earnings per resident ($$$) |
|---|---|---|
| 1 | Summit County | 40,823 |
| 2 | Morgan County | 36,725 |
| 3 | Tooele County | 32,236 |
| 4 | Wasatch County | 31,769 |
| 5 | Davis County | 31,582 |
| 6 | Salt Lake County | 30,609 |
| 7 | Weber County | 28,412 |
| 8 | Duchesne County | 28,189 |
| 9 | Box Elder County | 27,229 |
| 10 | Uintah County | 27,126 |
| 11 | Beaver County | 26,104 |
| 12 | Daggett County | 25,625 |
| 13 | Grand County | 25,502 |
| 14 | Emery County | 25,493 |
| 15 | Millard County | 25,192 |
| 16 | Washington County | 24,756 |
| 17 | Kane County | 24,359 |
| 18 | Rich County | 23,982 |
| 19 | Carbon County | 23,900 |
| 20 | Utah County | 23,548 |
| 21 | Juab County | 23,122 |
| 22 | Sevier County | 22,241 |
| 23 | Cache County | 22,108 |
| 24 | Garfield County | 21,898 |
| 25 | Wayne County | 21,079 |
| 26 | San Juan County | 20,493 |
| 27 | Iron County | 20,162 |
| 28 | Piute County | 19,129 |
| 29 | Sanpete County | 18,247 |
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