Place
- Dorchester10
- Cabin John9
- Washington8
- Wicomico8
- Frederick6
- SE of Laurel6
- Cecil5
- Plummer's Island5
- United States5
- Anne Arundel or Montgomery4
- High Island4
- Queen Anne's4
- Annapolis3
- Cove Point Marsh, Cove Point, along the Chesapeake Bay.3
- Cunningham Swamp, at Western Maryland 4H Center ca. 10 mi SSE of Grantsville3
- Kent3
- Liverpool3
- Patuxent Research Refuge, Plot 16783
- Salisbury.3
- Somerset3