| Index | Clark | South Dakota | National |
| Income per capita | $43,370 | $41,166 | $44,883 |
| Median household income | $60,165 | $77,914 | $81,333 |
| Median income owner occupied | $66,455 | $100,475 | $106,172 |
| Median income renter occupied | $43,756 | $45,187 | $52,080 |
| Median earnings male | $45,812 | $52,540 | $54,343 |
| Median earnings female | $28,770 | $36,073 | $38,439 |
| Unemployment rate | 2.5% | 2.9% | 4.9% |
| Poverty level | 9.4% | 14.0% | 15.1% |

| Labour Type | Male | Female |
| Construction industry | 16.4% | 16.4% |
| Manufacturing sector | 12.2% | 12.2% |
| Financial & insurance services | 4.3% | 4.3% |
| Wholesale & retail services | 12.8% | 12.8% |
| Public administration | 3.3% | 3.3% |
| Transportation, warehousing & utilities | 8.6% | 8.6% |
| Education, health & social services | 4.9% | 4.9% |
| Other | 37.5% | 37.5% |
| City | Population | Household Income | National Avg. |
| Naples, SD | 45 | $178,674 | 119.7% |
| Wallace, SD | 70 | $91,199 | 12.1% |
| Garden City, SD | 97 | $78,348 | 3.7% |
| Bradley, SD | 71 | $72,983 | 10.3% |
| Raymond, SD | 33 | $70,138 | 13.8% |
| Clark, SD | 1,272 | $60,165 | 26.0% |
| City | Population | Household Income | National Avg. |
| Brilliant, AL | 1,272 | $60,038 | 26.2% |
| Milford, IL | 1,272 | $72,161 | 11.3% |
| Shelton, NE | 1,272 | $74,193 | 8.8% |
| Newville, PA | 1,272 | $65,199 | 19.8% |
| Saint-Valère, QC | 1,272 | n/a | |
| Clark, SD | 1,272 | $60,165 | 26.0% |