| Index | Northfield | Illinois | National |
| Income per capita | $103,893 | $31,502 | $29,829 |
| Median household income | $143,661 | $59,196 | $55,322 |
| Median income owner occupied | $149,737 | $75,354 | $70,586 |
| Median income renter occupied | $76,750 | $34,488 | $35,192 |
| Median earnings male | $87,750 | $40,474 | $36,919 |
| Median earnings female | $48,971 | $27,197 | $26,250 |
| Unemployment rate | 0.2% | 5.3% | 4.7% |
| Poverty level | 8.3% | 14.0% | 15.1% |
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| Labour Type | Male | Female |
| Construction industry | 5.9% | 5.9% |
| Manufacturing sector | 8.7% | 8.7% |
| Financial & insurance services | 14.3% | 14.3% |
| Wholesale & retail services | 13.2% | 13.2% |
| Public administration | 5.2% | 5.2% |
| Transportation, warehousing & utilities | 2.4% | 2.4% |
| Education, health & social services | 9.0% | 9.0% |
| Other | 39.7% | 39.7% |
| City | Population | Household Income | National Avg. |
| Winnetka, IL | 12,361 | $250,001 | 351.9% |
| Kenilworth, IL | 2,356 | $241,591 | 336.7% |
| Riverwoods, IL | 3,536 | $231,477 | 318.4% |
| Kildeer, IL | 4,007 | $212,500 | 284.1% |
| Long Grove, IL | 7,907 | $207,188 | 274.5% |
| Northfield, IL | 5,678 | $143,661 | 159.7% |
| City | Population | Household Income | National Avg. |
| Montrose-Ghent, OH | 5,677 | $124,735 | 125.5% |
| Trenton, MO | 5,679 | $44,500 | 19.6% |
| Lackland AFB, TX | 5,679 | $80,430 | 45.4% |
| Sharon Hill, PA | 5,680 | $59,656 | 7.8% |
| Eastwood, MI | 5,675 | $51,107 | 7.6% |
| Northfield, IL | 5,678 | $143,661 | 159.7% |
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