| Index | Spencer | South Dakota | National |
| Income per capita | $46,064 | $41,166 | $44,883 |
| Median household income | $75,210 | $77,914 | $81,333 |
| Median income owner occupied | $84,764 | $100,475 | $106,172 |
| Median income renter occupied | $0 | $45,187 | $52,080 |
| Median earnings male | $80,958 | $52,540 | $54,343 |
| Median earnings female | $39,416 | $36,073 | $38,439 |
| Unemployment rate | 0.0% | 2.9% | 4.9% |
| Poverty level | 1.5% | 14.0% | 15.1% |

| Labour Type | Male | Female |
| Construction industry | 3.7% | 3.7% |
| Manufacturing sector | 33.3% | 33.3% |
| Financial & insurance services | 0.0% | 0.0% |
| Wholesale & retail services | 33.3% | 33.3% |
| Public administration | 0.0% | 0.0% |
| Transportation, warehousing & utilities | 14.8% | 14.8% |
| Education, health & social services | 0.0% | 0.0% |
| Other | 14.8% | 14.8% |
| City | Population | Household Income | National Avg. |
| Emery, SD | 520 | $92,594 | 13.8% |
| Salem, SD | 1,207 | $86,077 | 5.8% |
| Alexandria, SD | 786 | $76,702 | 5.7% |
| Bridgewater, SD | 330 | $76,298 | 6.2% |
| Canistota, SD | 688 | $74,164 | 8.8% |
| Spencer, SD | 136 | $75,210 | 7.5% |
| City | Population | Household Income | National Avg. |
| Pitkas Point, AK | 136 | $76,346 | 6.1% |
| Lester, AL | 136 | $64,549 | 20.6% |
| McKittrick, CA | 136 | $58,026 | 28.7% |
| Vallecito, CA | 136 | $66,018 | 18.8% |
| Volta, CA | 136 | $61,660 | 24.2% |
| Spencer, SD | 136 | $75,210 | 7.5% |