| Index | St. Mary | Missouri | National |
| Income per capita | $19,066 | $27,044 | $29,829 |
| Median household income | $56,875 | $49,593 | $55,322 |
| Median income owner occupied | $63,000 | $62,242 | $70,586 |
| Median income renter occupied | $20,417 | $30,016 | $35,192 |
| Median earnings male | $30,714 | $34,901 | $36,919 |
| Median earnings female | $20,625 | $24,771 | $26,250 |
| Unemployment rate | 2.0% | 4.1% | 4.7% |
| Poverty level | 12.6% | 15.3% | 15.1% |
| Labour Type | Male | Female |
| Construction industry | 17.8% | 17.8% |
| Manufacturing sector | 35.6% | 35.6% |
| Financial & insurance services | 0.0% | 0.0% |
| Wholesale & retail services | 11.1% | 11.1% |
| Public administration | 0.0% | 0.0% |
| Transportation, warehousing & utilities | 2.2% | 2.2% |
| Education, health & social services | 2.2% | 2.2% |
| Other | 31.1% | 31.1% |
| City | Population | Household Income | National Avg. |
| Ozora, MO | 109 | $86,250 | 55.9% |
| Bloomsdale, MO | 828 | $69,375 | 25.4% |
| Longtown, MO | 127 | $57,500 | 3.9% |
| Ellis Grove, IL | 316 | $53,750 | 2.8% |
| Evansville, IL | 760 | $52,308 | 5.4% |
| St. Mary, MO | 261 | $56,875 | 2.8% |
| City | Population | Household Income | National Avg. |
| Moro, AR | 261 | $37,969 | 31.4% |
| Acampo, CA | 261 | $0 | 100.0% |
| Lineville, IA | 261 | $51,250 | 7.4% |
| Shamrock Lakes, IN | 261 | $67,500 | 22.0% |
| Belfry, KY | 261 | $116,122 | 109.9% |
| St. Mary, MO | 261 | $56,875 | 2.8% |
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