Delaware Boundary Markers

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Delaware Boundary Markers
Mason-Dixon Monument Oct 11.jpg
Mason–Dixon Monument, October 2011
Location State boundary lines between DE-MD/DE-PA, Delaware
Area 0 acres (0 ha)
Built 1763 (1763)
Architect Mason, Charles; Dixon, Jeremiah
NRHP Reference # 75002101[1]
Added to NRHP February 18, 1975

Delaware Boundary Markers is a national historic district located on the State boundary lines between Delaware, Maryland, and Pennsylvania. The district includes 94 contributing sites along the Mason–Dixon line and includes the Transpeninsular Line, "Post Marked West" site, Mason–Dixon line, Tangent Line, The Arc, and The 12-Mile Circle.[2]

It was added to the National Register of Historic Places in 1975.[1]


  1. ^ a b National Park Service (2010-07-09). "National Register Information System". National Register of Historic Places. National Park Service. 
  2. ^ Edward F. Heite (October 1974). "National Register of Historic Places Inventory/Nomination: Delaware Boundary Markers" (PDF).  and Accompanying photo