| Index | Old Mill Creek | Illinois | National |
| Income per capita | $39,789 | $31,502 | $29,829 |
| Median household income | $100,648 | $59,196 | $55,322 |
| Median income owner occupied | $0 | $75,354 | $70,586 |
| Median income renter occupied | $100,787 | $34,488 | $35,192 |
| Median earnings male | $87,857 | $40,474 | $36,919 |
| Median earnings female | $29,750 | $27,197 | $26,250 |
| Unemployment rate | 0.6% | 5.3% | 4.7% |
| Poverty level | 0.0% | 14.0% | 15.1% |


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| Labour Type | Male | Female |
| Construction industry | 1.5% | 1.5% |
| Manufacturing sector | 6.2% | 6.2% |
| Financial & insurance services | 0.0% | 0.0% |
| Wholesale & retail services | 3.1% | 3.1% |
| Public administration | 6.2% | 6.2% |
| Transportation, warehousing & utilities | 3.1% | 3.1% |
| Education, health & social services | 1.5% | 1.5% |
| Other | 78.5% | 78.5% |
| City | Population | Household Income | National Avg. |
| Hawthorn Woods, IL | 8,313 | $206,875 | 273.9% |
| Lake Forest, IL | 19,497 | $189,118 | 241.8% |
| Lake Bluff, IL | 5,540 | $174,444 | 215.3% |
| Libertyville, IL | 20,300 | $150,580 | 172.2% |
| Port Barrington, IL | 1,742 | $144,531 | 161.3% |
| Old Mill Creek, IL | 200 | $100,648 | 81.9% |
| City | Population | Household Income | National Avg. |
| Grayling, AK | 200 | $30,000 | 45.8% |
| Port Alsworth, AK | 200 | $89,688 | 62.1% |
| Lockhart, AL | 200 | $30,625 | 44.6% |
| Ellenton, GA | 200 | $40,625 | 26.6% |
| Burr Oak, IA | 200 | $37,500 | 32.2% |
| Old Mill Creek, IL | 200 | $100,648 | 81.9% |