| | Rockville, MD | Crystal Lake, IL | United States |
| Unemployment Rate | 4.7% | 4.9% | 6.0% |
| Recent Job Growth | 0.8% | -0.2% | 1.6% |
| Future Job Growth | 30.4% | 27.9% | 33.5% |
| Sales Taxes | 6.0% | 7.8% | 6.2% |
| Income Taxes | 8.0% | 5.0% | 4.6% |
| Income per Cap. | $57,336 | $41,507 | $37,638 |
| Household Income | $116,031 | $96,274 | $69,021 |
| Family Median Income | $136,932 | $109,211 | $85,028 |
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| Est. Households By Income | | | |
| | Rockville, MD | Crystal Lake, IL | United States |
| Income Less Than 15K | 5.3% | 4.6% | 9.4% |
| Income between 15K and 20K | 2.2% | 1.5% | 3.8% |
| Income between 20K and 30K | 4.0% | 4.8% | 8.1% |
| Income between 30K and 40K | 2.6% | 4.2% | 8.0% |
| Income between 40K and 50K | 5.0% | 8.2% | 7.6% |
| Income between 50K and 60K | 5.4% | 5.9% | 7.2% |
| Income between 60K and 75K | 6.8% | 8.0% | 9.6% |
| Income between 75K and 100K | 11.5% | 15.0% | 12.8% |
| Income between 100K and 150K | 20.6% | 25.5% | 16.3% |
| Income between 150K and 200K | 15.0% | 11.1% | 7.8% |
| Income greater than 200K | 21.7% | 11.2% | 9.5% |
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| Population By Occupation | | | |
| | Rockville, MD | Crystal Lake, IL | United States |
| Management, business, finance | 23.8% | 19.8% | 16.4% |
| Engineering, computers, science | 20.4% | 5.8% | 6.5% |
| Community, social services | 2.0% | 1.5% | 1.8% |
| Legal | 2.9% | 0.9% | 1.2% |
| Education, library | 6.6% | 7.0% | 6.2% |
| Arts, design, media, sports, entertainment | 3.5% | 2.3% | 2.0% |
| Healthcare practitioners and technology | 6.0% | 4.7% | 6.2% |
| Healthcare support | 1.5% | 2.4% | 3.3% |
| Firefighters, law enforcement | 1.6% | 2.0% | 2.1% |
| Food preparation, serving | 3.8% | 4.8% | 5.4% |
| Building maintenance | 2.1% | 2.4% | 3.6% |
| Personal care | 2.6% | 4.2% | 2.6% |
| Sales, office, administrative support | 14.8% | 23.2% | 20.9% |
| Farming, fishing, forestry | 0.0% | 0.3% | 0.6% |
| Construction, extraction, maintenance/repair | 4.6% | 7.8% | 8.1% |
| Production, transportation, material moving | 3.9% | 10.9% | 13.1% |