| Index | Erwin | South Dakota | National |
| Income per capita | $23,270 | $27,516 | $29,829 |
| Median household income | $0 | $52,078 | $55,322 |
| Median income owner occupied | $0 | $66,299 | $70,586 |
| Median income renter occupied | $0 | $30,800 | $35,192 |
| Median earnings male | $55,417 | $35,140 | $36,919 |
| Median earnings female | $11,875 | $24,451 | $26,250 |
| Unemployment rate | 0.0% | 2.8% | 4.7% |
| Poverty level | 22.2% | 14.0% | 15.1% |


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| Labour Type | Male | Female |
| Construction industry | 66.7% | 66.7% |
| Manufacturing sector | 16.7% | 16.7% |
| Financial & insurance services | 0.0% | 0.0% |
| Wholesale & retail services | 16.7% | 16.7% |
| Public administration | 0.0% | 0.0% |
| Transportation, warehousing & utilities | 0.0% | 0.0% |
| Education, health & social services | 0.0% | 0.0% |
| Other | 0.0% | 0.0% |
| City | Population | Household Income | National Avg. |
| De Smet, SD | 1,041 | $64,479 | 16.6% |
| Lake Norden, SD | 531 | $62,955 | 13.8% |
| Willow Lake, SD | 445 | $53,365 | 3.5% |
| Badger, SD | 94 | $52,000 | 6.0% |
| Lake Preston, SD | 448 | $51,397 | 7.1% |
| Erwin, SD | 54 | $0 | 100.0% |
| City | Population | Household Income | National Avg. |
| Perryville, AK | 54 | $28,750 | 48.0% |
| Rampart, AK | 54 | $51,875 | 6.2% |
| Putnam, AL | 54 | $0 | 100.0% |
| Copper Hill, AZ | 54 | $0 | 100.0% |
| Fellows, CA | 54 | $0 | 100.0% |
| Erwin, SD | 54 | $0 | 100.0% |