| Index | O'Fallon | Illinois | National |
| Income per capita | $65,136 | $47,397 | $44,883 |
| Median household income | $132,987 | $88,967 | $81,333 |
| Median income owner occupied | $161,488 | $111,557 | $106,172 |
| Median income renter occupied | $75,154 | $52,117 | $52,080 |
| Median earnings male | $90,471 | $60,185 | $54,343 |
| Median earnings female | $57,063 | $40,368 | $38,439 |
| Unemployment rate | 2.4% | 6.6% | 4.9% |
| 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 | 4,157 | $130,324 | 60.2% |
| Shiloh, IL | 13,870 | $129,539 | 59.3% |
| St. Jacob, IL | 1,590 | $124,201 | 52.7% |
| Glen Carbon, IL | 12,963 | $124,119 | 52.6% |
| Maryville, IL | 8,220 | $124,089 | 52.6% |
| O'Fallon, IL | 30,151 | $132,987 | 63.5% |
| City | Population | Household Income | National Avg. |
| Southgate, MI | 30,149 | $87,800 | 8.0% |
| Raytown, MO | 30,162 | $83,161 | 2.2% |
| Maryville, TN | 30,172 | $96,964 | 19.2% |
| Oak Park, MI | 30,129 | $79,279 | 2.5% |
| Jamestown, NY | 30,127 | $51,027 | 37.3% |
| O'Fallon, IL | 30,151 | $132,987 | 63.5% |