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| Park Name | Notes | Stamp(s) |
AntietamNational Battlefield |
A civil war battle. | 
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Assateague IslandNational Seashore |
Never been. | 
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Catoctin MountainPark |
An urban nature preserve. | 
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Chesapeake and Ohio CanalNational Historical Park |
A lengthy canal. |  
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Clara BartonNational Historic Site |
The Red Cross founder's house. | 
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Fort McHenryNational Monument and Historic Shrine |
War of 1812. | 
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Fort WashingtonPark |
A fort on the Potomac. | 
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GreenbeltPark |
An urban preserve. |  
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HamptonNational Historic Site |
A house. | 
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MonocacyNational Battlefield |
A civil war battle. | 
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PiscatawayPark |
An old farm. |  
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Thomas StoneNational Historic Site |
A house. | 
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