| Capital: | Leonardtown |
|---|---|
| Origen y Formación del condado: | From unorganized territory. Was named Potomac County between 1654 and 1658. |
| Población: | 108,987 habitantes |
| Área: | 611 sq mi |
| Localización del condado dentro de Maryland: |
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Localidades en St. Mary's, Maryland
- Abell
- Avenue
- Bushwood
- California
- Callaway
- Chaptico
- Clements
- Coltons Point
- Compton
- Dameron
- Drayden
- Golden Beach
- Great Mills
- Helen
- Hollywood
- Leonardtown
- Lexington Park
- Loveville
- Mechanicsville
- Morganza
- Piney Point
- Ridge
- Saint Inigoes
- Saint Marys City
- Scotland
- Tall Timbers
- Valley Lee