| Index | St. Marys | Pennsylvania | National |
| Income per capita | $32,627 | $30,137 | $29,829 |
| Median household income | $54,950 | $54,895 | $55,322 |
| Median income owner occupied | $70,712 | $68,587 | $70,586 |
| Median income renter occupied | $28,731 | $31,605 | $35,192 |
| Median earnings male | $41,219 | $39,478 | $36,919 |
| Median earnings female | $32,053 | $26,440 | $26,250 |
| Unemployment rate | 4.3% | 4.5% | 4.7% |
| Poverty level | 9.2% | 13.3% | 15.1% |


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| Labour Type | Male | Female |
| Construction industry | 8.8% | 8.8% |
| Manufacturing sector | 49.8% | 49.8% |
| Financial & insurance services | 0.5% | 0.5% |
| Wholesale & retail services | 15.2% | 15.2% |
| Public administration | 1.6% | 1.6% |
| Transportation, warehousing & utilities | 1.7% | 1.7% |
| Education, health & social services | 5.4% | 5.4% |
| Other | 15.2% | 15.2% |
| City | Population | Household Income | National Avg. |
| Kersey, PA | 1,022 | $73,545 | 32.9% |
| Byrnedale, PA | 588 | $67,652 | 22.3% |
| Crenshaw, PA | 320 | $64,931 | 17.4% |
| Weedville, PA | 460 | $56,875 | 2.8% |
| James City, PA | 250 | $47,500 | 14.1% |
| St. Marys, PA | 12,333 | $54,950 | 0.7% |
| City | Population | Household Income | National Avg. |
| New Baltimore, MI | 12,333 | $83,767 | 51.4% |
| Gulfport, FL | 12,334 | $53,869 | 2.6% |
| Tamalpais-Homestead Valley, CA | 12,331 | $187,734 | 239.3% |
| Streator, IL | 12,337 | $40,778 | 26.3% |
| Lincolnwood, IL | 12,338 | $90,422 | 63.4% |
| St. Marys, PA | 12,333 | $54,950 | 0.7% |