| Index | Oldham | South Dakota | National |
| Income per capita | $35,298 | $27,516 | $29,829 |
| Median household income | $45,000 | $52,078 | $55,322 |
| Median income owner occupied | $59,375 | $66,299 | $70,586 |
| Median income renter occupied | $5,750 | $30,800 | $35,192 |
| Median earnings male | $45,000 | $35,140 | $36,919 |
| Median earnings female | $22,222 | $24,451 | $26,250 |
| Unemployment rate | 0.0% | 2.8% | 4.7% |
| Poverty level | 16.0% | 14.0% | 15.1% |
| Labour Type | Male | Female |
| Construction industry | 2.0% | 2.0% |
| Manufacturing sector | 26.5% | 26.5% |
| Financial & insurance services | 0.0% | 0.0% |
| Wholesale & retail services | 18.4% | 18.4% |
| Public administration | 0.0% | 0.0% |
| Transportation, warehousing & utilities | 34.7% | 34.7% |
| Education, health & social services | 18.4% | 18.4% |
| Other | 0.0% | 0.0% |
| City | Population | Household Income | National Avg. |
| De Smet, SD | 1,041 | $64,479 | 16.6% |
| Ramona, SD | 413 | $56,250 | 1.7% |
| Arlington, SD | 1,007 | $55,125 | 0.4% |
| Lake Preston, SD | 448 | $51,397 | 7.1% |
| Howard, SD | 754 | $43,393 | 21.6% |
| Oldham, SD | 131 | $45,000 | 18.7% |
| City | Population | Household Income | National Avg. |
| Lester, AL | 131 | $43,750 | 20.9% |
| St. Paul, AR | 131 | $34,659 | 37.4% |
| Genoa, CO | 131 | $40,833 | 26.2% |
| Hartwick, IA | 131 | $67,500 | 22.0% |
| Marne, IA | 131 | $50,625 | 8.5% |
| Oldham, SD | 131 | $45,000 | 18.7% |
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