| | Rock Island, WA | Spearfish, SD | United States |
| Unemployment Rate | 5.9% | 3.0% | 6.0% |
| Recent Job Growth | 1.3% | 1.5% | 1.6% |
| Future Job Growth | 38.7% | 32.9% | 33.5% |
| Sales Taxes | 8.2% | 6.5% | 6.2% |
| Income Taxes | 0.0% | 0.0% | 4.6% |
| Income per Cap. | $18,134 | $40,007 | $37,638 |
| Household Income | $50,000 | $52,258 | $69,021 |
| Family Median Income | $65,547 | $84,596 | $85,028 |
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| Est. Households By Income | | | |
| | Rock Island, WA | Spearfish, SD | United States |
| Income Less Than 15K | 5.3% | 10.7% | 9.4% |
| Income between 15K and 20K | 2.3% | 4.7% | 3.8% |
| Income between 20K and 30K | 13.8% | 13.0% | 8.1% |
| Income between 30K and 40K | 15.6% | 6.6% | 8.0% |
| Income between 40K and 50K | 13.1% | 12.9% | 7.6% |
| Income between 50K and 60K | 6.7% | 6.7% | 7.2% |
| Income between 60K and 75K | 15.1% | 8.7% | 9.6% |
| Income between 75K and 100K | 22.9% | 11.5% | 12.8% |
| Income between 100K and 150K | 4.1% | 15.1% | 16.3% |
| Income between 150K and 200K | 0.7% | 2.4% | 7.8% |
| Income greater than 200K | 0.5% | 7.9% | 9.5% |
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| Population By Occupation | | | |
| | Rock Island, WA | Spearfish, SD | United States |
| Management, business, finance | 4.9% | 14.0% | 16.4% |
| Engineering, computers, science | 0.6% | 4.6% | 6.5% |
| Community, social services | 0.0% | 1.9% | 1.8% |
| Legal | 0.0% | 1.3% | 1.2% |
| Education, library | 2.3% | 6.0% | 6.2% |
| Arts, design, media, sports, entertainment | 0.0% | 1.7% | 2.0% |
| Healthcare practitioners and technology | 0.6% | 6.5% | 6.2% |
| Healthcare support | 7.4% | 3.6% | 3.3% |
| Firefighters, law enforcement | 0.0% | 2.1% | 2.1% |
| Food preparation, serving | 1.8% | 13.6% | 5.4% |
| Building maintenance | 11.9% | 2.7% | 3.6% |
| Personal care | 3.5% | 3.2% | 2.6% |
| Sales, office, administrative support | 20.2% | 22.6% | 20.9% |
| Farming, fishing, forestry | 6.8% | 0.3% | 0.6% |
| Construction, extraction, maintenance/repair | 7.8% | 7.3% | 8.1% |
| Production, transportation, material moving | 32.1% | 8.8% | 13.1% |