| Index | Willow Lake | South Dakota | National |
| Income per capita | $27,144 | $41,166 | $44,883 |
| Median household income | $78,022 | $77,914 | $81,333 |
| Median income owner occupied | $70,849 | $100,475 | $106,172 |
| Median income renter occupied | $113,262 | $45,187 | $52,080 |
| Median earnings male | $72,949 | $52,540 | $54,343 |
| Median earnings female | $33,322 | $36,073 | $38,439 |
| Unemployment rate | 0.0% | 2.9% | 4.9% |
| Poverty level | 4.5% | 14.0% | 15.1% |

| Labour Type | Male | Female |
| Construction industry | 14.8% | 14.8% |
| Manufacturing sector | 13.9% | 13.9% |
| Financial & insurance services | 0.0% | 0.0% |
| Wholesale & retail services | 2.8% | 2.8% |
| Public administration | 1.9% | 1.9% |
| Transportation, warehousing & utilities | 0.0% | 0.0% |
| Education, health & social services | 9.3% | 9.3% |
| Other | 57.4% | 57.4% |
| City | Population | Household Income | National Avg. |
| Naples, SD | 45 | $178,674 | 119.7% |
| Hazel, SD | 149 | $80,098 | 1.5% |
| Vienna, SD | 130 | $64,221 | 21.0% |
| Bryant, SD | 762 | $63,705 | 21.7% |
| Erwin, SD | 56 | $0 | 100.0% |
| Willow Lake, SD | 454 | $78,022 | 4.1% |
| City | Population | Household Income | National Avg. |
| Wainwright, AK | 454 | $103,042 | 26.7% |
| Dewey Beach, DE | 454 | $142,123 | 74.7% |
| Fenwick Island, DE | 454 | $125,809 | 54.7% |
| Weston, ID | 454 | $98,607 | 21.2% |
| Cunningham, KS | 454 | $80,146 | 1.5% |
| Willow Lake, SD | 454 | $78,022 | 4.1% |