| Index | O'Fallon | Missouri | National |
| Income per capita | $59,036 | $39,715 | $44,883 |
| Median household income | $137,452 | $72,613 | $81,333 |
| Median income owner occupied | $154,147 | $90,986 | $106,172 |
| Median income renter occupied | $77,689 | $45,210 | $52,080 |
| Median earnings male | $81,480 | $52,324 | $54,343 |
| Median earnings female | $53,162 | $36,971 | $38,439 |
| Unemployment rate | 2.3% | 4.4% | 4.9% |
| Poverty level | 4.6% | 15.3% | 15.1% |

| Labour Type | Male | Female |
| Construction industry | 11.1% | 11.1% |
| Manufacturing sector | 18.9% | 18.9% |
| Financial & insurance services | 9.1% | 9.1% |
| Wholesale & retail services | 16.7% | 16.7% |
| Public administration | 2.6% | 2.6% |
| Transportation, warehousing & utilities | 6.0% | 6.0% |
| Education, health & social services | 8.0% | 8.0% |
| Other | 25.5% | 25.5% |
| City | Population | Household Income | National Avg. |
| Westwood, MO | 321 | $368,561 | 353.2% |
| Country Life Acres, MO | 54 | $365,640 | 349.6% |
| Clarkson Valley, MO | 2,697 | $312,556 | 284.3% |
| Town and Country, MO | 11,464 | $307,729 | 278.4% |
| Des Peres, MO | 8,916 | $253,995 | 212.3% |
| O'Fallon, MO | 90,020 | $137,452 | 69.0% |
| City | Population | Household Income | National Avg. |
| Newport Beach, CA | 90,043 | $200,001 | 145.9% |
| Waukegan, IL | 90,063 | $78,659 | 3.3% |
| Citrus Heights, CA | 90,373 | $96,983 | 19.2% |
| Ogden, UT | 90,520 | $84,649 | 4.1% |
| Peterborough, ON | 89,500 | n/a | |
| O'Fallon, MO | 90,020 | $137,452 | 69.0% |