| Index | O'Fallon | Illinois | National |
| Income per capita | $43,316 | $31,502 | $29,829 |
| Median household income | $90,432 | $59,196 | $55,322 |
| Median income owner occupied | $109,793 | $75,354 | $70,586 |
| Median income renter occupied | $50,231 | $34,488 | $35,192 |
| Median earnings male | $61,658 | $40,474 | $36,919 |
| Median earnings female | $38,541 | $27,197 | $26,250 |
| Unemployment rate | 2.3% | 5.3% | 4.7% |
| Poverty level | 4.0% | 14.0% | 15.1% |


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| Labour Type | Male | Female |
| Construction industry | 4.3% | 4.3% |
| Manufacturing sector | 8.9% | 8.9% |
| Financial & insurance services | 4.8% | 4.8% |
| Wholesale & retail services | 14.5% | 14.5% |
| Public administration | 13.2% | 13.2% |
| Transportation, warehousing & utilities | 9.2% | 9.2% |
| Education, health & social services | 9.1% | 9.1% |
| Other | 34.6% | 34.6% |
| City | Population | Household Income | National Avg. |
| Smithton, IL | 4,019 | $88,879 | 60.7% |
| Shiloh, IL | 13,465 | $87,076 | 57.4% |
| Glen Carbon, IL | 12,468 | $84,956 | 53.6% |
| Maryville, IL | 7,962 | $84,293 | 52.4% |
| St. Jacob, IL | 1,529 | $83,750 | 51.4% |
| O'Fallon, IL | 29,487 | $90,432 | 63.5% |
| City | Population | Household Income | National Avg. |
| Crofton, MD | 29,482 | $124,019 | 124.2% |
| Austintown, OH | 29,467 | $45,923 | 17.0% |
| Suisun City, CA | 29,459 | $82,325 | 48.8% |
| Canton, GA | 29,459 | $61,459 | 11.1% |
| Seguin, TX | 29,458 | $49,976 | 9.7% |
| O'Fallon, IL | 29,487 | $90,432 | 63.5% |