| Index | St. Marys | Iowa | National |
| Income per capita | $47,071 | $42,672 | $44,883 |
| Median household income | $103,661 | $81,387 | $81,333 |
| Median income owner occupied | $103,726 | $98,724 | $106,172 |
| Median income renter occupied | $0 | $45,890 | $52,080 |
| Median earnings male | $84,024 | $54,047 | $54,343 |
| Median earnings female | $31,748 | $36,462 | $38,439 |
| Unemployment rate | 0.0% | 3.2% | 4.9% |
| Poverty level | 8.8% | 12.3% | 15.1% |


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| 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 | 28 | $181,154 | 122.7% |
| Cumming, IA | 550 | $149,625 | 84.0% |
| Carlisle, IA | 4,329 | $125,796 | 54.7% |
| Norwalk, IA | 11,804 | $122,496 | 50.6% |
| St. Charles, IA | 813 | $115,203 | 41.6% |
| St. Marys, IA | 188 | $103,661 | 27.5% |
| City | Population | Household Income | National Avg. |
| Humnoke, AR | 188 | $54,504 | 33.0% |
| Beaver Valley, AZ | 188 | $0 | 100.0% |
| Fort Apache, AZ | 188 | $0 | 100.0% |
| San Simon, AZ | 188 | $33,214 | 59.2% |
| Litchfield, CA | 188 | $80,169 | 1.4% |
| St. Marys, IA | 188 | $103,661 | 27.5% |