| Index | St. Mary | Missouri | National |
| Income per capita | $28,618 | $39,715 | $44,883 |
| Median household income | $85,568 | $72,613 | $81,333 |
| Median income owner occupied | $95,323 | $90,986 | $106,172 |
| Median income renter occupied | $30,775 | $45,210 | $52,080 |
| Median earnings male | $45,987 | $52,324 | $54,343 |
| Median earnings female | $30,358 | $36,971 | $38,439 |
| Unemployment rate | 2.1% | 4.4% | 4.9% |
| 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 | 113 | $129,029 | 58.6% |
| Bloomsdale, MO | 858 | $101,882 | 25.3% |
| Longtown, MO | 130 | $84,422 | 3.8% |
| Ellis Grove, IL | 322 | $81,366 | 0.0% |
| Perryville, MO | 8,741 | $78,169 | 3.9% |
| St. Mary, MO | 266 | $85,568 | 5.2% |
| City | Population | Household Income | National Avg. |
| Acampo, CA | 266 | $0 | 100.0% |
| Keene, CA | 266 | $132,995 | 63.5% |
| Yankee Hill, CA | 266 | $67,516 | 17.0% |
| Peetz, CO | 266 | $72,049 | 11.4% |
| Bovill, ID | 266 | $59,206 | 27.2% |
| St. Mary, MO | 266 | $85,568 | 5.2% |