| Index | Willow Lake | South Dakota | National |
| Income per capita | $18,437 | $27,516 | $29,829 |
| Median household income | $53,365 | $52,078 | $55,322 |
| Median income owner occupied | $48,194 | $66,299 | $70,586 |
| Median income renter occupied | $75,152 | $30,800 | $35,192 |
| Median earnings male | $48,750 | $35,140 | $36,919 |
| Median earnings female | $22,250 | $24,451 | $26,250 |
| Unemployment rate | 0.0% | 2.8% | 4.7% |
| Poverty level | 4.5% | 14.0% | 15.1% |


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| 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 | 44 | $121,875 | 120.3% |
| Hazel, SD | 143 | $54,375 | 1.7% |
| Vienna, SD | 126 | $43,304 | 21.7% |
| Bryant, SD | 735 | $42,250 | 23.6% |
| Erwin, SD | 54 | $0 | 100.0% |
| Willow Lake, SD | 445 | $53,365 | 3.5% |
| City | Population | Household Income | National Avg. |
| Caldwell, AR | 445 | $37,386 | 32.4% |
| Fort Thomas, AZ | 445 | $86,667 | 56.7% |
| Sugar City, CO | 445 | $39,185 | 29.2% |
| Fenwick Island, DE | 445 | $85,000 | 53.6% |
| Norway, IA | 445 | $63,542 | 14.9% |
| Willow Lake, SD | 445 | $53,365 | 3.5% |