Region
Maryland
Pennsylvania
10
Baltimore
4
Virginia
4
Baltimore (Md.)
3
United States
3
Delaware
2
Mason-Dixon Line
2
New Jersey
2
Philadelphia
2
Susquehanna River
2
Camp Patapsco
1
Camp Patapsco (Md.)
1
Chesapeake Bay (Md. and Va.)
1
Conewago Creek Valley (Adams County and York County, Pa.)
1
Elkton
1
Hagerstown
1
Kearny
1
Kent County
1
New York
1
New York (State)
1
Penn
1
Potomac River
1
Smith's Point
1
United States, Maryland
1
United States, Virginia
1
Washington (D.C.)
1
West Virginia
1