| Index | Millbrook | Illinois | National |
| Income per capita | $36,605 | $31,502 | $29,829 |
| Median household income | $91,875 | $59,196 | $55,322 |
| Median income owner occupied | $105,625 | $75,354 | $70,586 |
| Median income renter occupied | $67,500 | $34,488 | $35,192 |
| Median earnings male | $58,750 | $40,474 | $36,919 |
| Median earnings female | $31,823 | $27,197 | $26,250 |
| Unemployment rate | 5.3% | 5.3% | 4.7% |
| Poverty level | 9.3% | 14.0% | 15.1% |
| Labour Type | Male | Female |
| Construction industry | 28.4% | 28.4% |
| Manufacturing sector | 6.2% | 6.2% |
| Financial & insurance services | 4.9% | 4.9% |
| Wholesale & retail services | 16.0% | 16.0% |
| Public administration | 2.5% | 2.5% |
| Transportation, warehousing & utilities | 12.3% | 12.3% |
| Education, health & social services | 4.9% | 4.9% |
| Other | 24.7% | 24.7% |
| City | Population | Household Income | National Avg. |
| Prestbury, IL | 1,978 | $112,155 | 102.7% |
| Sugar Grove, IL | 9,756 | $110,607 | 99.9% |
| Big Rock, IL | 1,271 | $106,375 | 92.3% |
| Newark, IL | 1,325 | $101,750 | 83.9% |
| Yorkville, IL | 19,386 | $101,245 | 83.0% |
| Millbrook, IL | 357 | $91,875 | 66.1% |
| City | Population | Household Income | National Avg. |
| Shonto, AZ | 357 | $44,583 | 19.4% |
| Chacra, CO | 357 | $118,531 | 114.3% |
| City of Creede, CO | 357 | $44,638 | 19.3% |
| La Crosse, FL | 357 | $51,786 | 6.4% |
| Sadorus, IL | 357 | $49,500 | 10.5% |
| Millbrook, IL | 357 | $91,875 | 66.1% |
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