The median income of Isabel residents was $22,679 per year, adjusted for inflation. It had 59 households with a population of 168.
The city with the highest median resident income in the state was Milltown with $64,167 per year after adjusting for inflation – $41,488 more than Isabel. It had 11 households with a population of 23.
The city with the lowest median resident income in the state was Wounded Knee with $5,605 per year after adjusting for inflation – $17,074 less than Isabel. It had 84 households with a population of 456.
Top 100 cities by earnings per resident (2018)
| Rank | City | Earnings per resident |
|---|---|---|
| 1 | Milltown | $64,167 |
| 2 | Dakota Dunes | $58,893 |
| 3 | Long Lake | $55,938 |
| 4 | Cow Creek | $53,750 |
| 5 | Running Water | $51,250 |
| 6 | Anderson | $49,205 |
| 7 | Blucksberg Mountain | $45,743 |
| 8 | Lake Madison | $43,162 |
| 9 | Crooks | $42,929 |
| 10 | Lake Poinsett | $42,500 |
| 10 | Vilas | $42,500 |
| 12 | Warner | $41,750 |
| 13 | Davis | $41,667 |
| 14 | Bancroft | $41,500 |
| 15 | Pine Lakes Addition | $41,250 |
| 16 | Brandon | $41,241 |
| 17 | Baltic | $40,985 |
| 18 | Tea | $40,746 |
| 19 | Altamont | $40,625 |
| 20 | Harrisburg | $40,615 |
| 21 | Fort Pierre | $40,156 |
| 22 | Bath | $40,052 |
| 23 | Summerset | $40,029 |
| 24 | Pickstown | $40,000 |
| 24 | Utica | $40,000 |
| 26 | Colonial Pine Hills | $39,850 |
| 27 | Goodwin | $39,583 |
| 28 | Fairburn | $39,375 |
| 29 | Bath Corner | $38,696 |
| 30 | Chester | $38,490 |
| 31 | Northville | $38,333 |
| 32 | Belvidere | $38,281 |
| 33 | Columbia | $38,125 |
| 34 | Ward | $38,036 |
| 35 | Buffalo | $37,917 |
| 36 | Onida | $37,663 |
| 37 | Pierre | $37,428 |
| 38 | Brandt | $37,321 |
| 39 | Aurora | $37,240 |
| 40 | Dante | $37,083 |
| 41 | Pierpont | $36,736 |
| 42 | Colman | $36,607 |
| 43 | Wallace | $36,458 |
| 44 | Hartford | $36,167 |
| 45 | Hermosa | $36,000 |
| 46 | Dimock | $35,875 |
| 47 | Hitchcock | $35,781 |
| 48 | Castlewood | $35,769 |
| 49 | Groton | $35,568 |
| 50 | Ree Heights | $35,500 |
| 51 | Naples | $35,313 |
| 52 | Worthing | $34,909 |
| 53 | Roscoe | $34,792 |
| 54 | Sherman | $34,750 |
| 55 | Dell Rapids | $34,603 |
| 56 | Olivet | $34,583 |
| 57 | Kranzburg | $34,375 |
| 58 | Cavour | $34,286 |
| 59 | Beresford | $34,255 |
| 60 | Renner Corner | $34,219 |
| 61 | Artesian | $34,000 |
| 62 | Meadow View Addition | $33,958 |
| 63 | Dolton | $33,750 |
| 63 | Chelsea | $33,750 |
| 63 | Fairview | $33,750 |
| 66 | Wolsey | $33,661 |
| 67 | Clear Lake | $33,611 |
| 68 | Elk Point | $33,596 |
| 69 | Tabor | $33,571 |
| 70 | Kennebec | $33,309 |
| 71 | Presho | $33,264 |
| 72 | Plankinton | $33,250 |
| 73 | Tulare | $33,125 |
| 74 | Piedmont | $32,917 |
| 75 | St. Lawrence | $32,875 |
| 76 | Jefferson | $32,794 |
| 77 | Colton | $32,685 |
| 78 | White | $32,679 |
| 78 | Alpena | $32,679 |
| 80 | Mount Vernon | $32,589 |
| 81 | Trent | $32,578 |
| 82 | Geddes | $32,500 |
| 82 | La Bolt | $32,500 |
| 84 | Faulkton | $32,438 |
| 85 | Akaska | $32,188 |
| 86 | Valley Springs | $32,171 |
| 87 | Sioux Falls | $32,058 |
| 88 | Garretson | $32,054 |
| 89 | Murdo | $32,024 |
| 90 | Westport | $31,944 |
| 91 | Brentford | $31,932 |
| 92 | Nunda | $31,875 |
| 92 | Bruce | $31,875 |
| 94 | Stratford | $31,750 |
| 94 | Ramona | $31,750 |
| 96 | Britton | $31,685 |
| 97 | Ethan | $31,667 |
| 98 | Lesterville | $31,607 |
| 99 | Garden City | $31,563 |
| 100 | Elkton | $31,509 |
* All values are inflation-adjusted

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