| Index | St. Marys | Iowa | National |
| Income per capita | $31,397 | $28,872 | $29,829 |
| Median household income | $68,333 | $54,570 | $55,322 |
| Median income owner occupied | $69,333 | $66,527 | $70,586 |
| Median income renter occupied | $0 | $30,828 | $35,192 |
| Median earnings male | $56,250 | $37,409 | $36,919 |
| Median earnings female | $21,250 | $25,115 | $26,250 |
| Unemployment rate | 0.0% | 3.1% | 4.7% |
| Poverty level | 8.8% | 12.3% | 15.1% |
| Labour Type | Male | Female |
| Construction industry | 37.1% | 37.1% |
| Manufacturing sector | 8.6% | 8.6% |
| Financial & insurance services | 5.7% | 5.7% |
| Wholesale & retail services | 11.4% | 11.4% |
| Public administration | 0.0% | 0.0% |
| Transportation, warehousing & utilities | 8.6% | 8.6% |
| Education, health & social services | 5.7% | 5.7% |
| Other | 22.9% | 22.9% |
| City | Population | Household Income | National Avg. |
| Bevington, IA | 27 | $123,750 | 123.7% |
| Cumming, IA | 536 | $99,583 | 80.0% |
| Carlisle, IA | 4,181 | $86,087 | 55.6% |
| Norwalk, IA | 11,467 | $83,241 | 50.5% |
| St. Charles, IA | 787 | $77,083 | 39.3% |
| St. Marys, IA | 182 | $68,333 | 23.5% |
| City | Population | Household Income | National Avg. |
| Fort Green, FL | 182 | $82,875 | 49.8% |
| Green Mountain, IA | 182 | $49,327 | 10.8% |
| Berlin, IL | 182 | $63,125 | 14.1% |
| Minden City, MI | 182 | $39,722 | 28.2% |
| Woodland, MS | 182 | $0 | 100.0% |
| St. Marys, IA | 182 | $68,333 | 23.5% |
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