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Delaware Boundary Markers
U.S. National Register of Historic Places
U.S. Historic district
Transpeninsular Line Midpoint Marker, the first crownstone set
Show map of DelawareShow map of the United States
Location	State boundary lines between Delaware and Maryland, and between Delaware and Pennsylvania
Coordinates	38°27′36″N 75°41′37″W / 38.46000°N 75.69361°W / 38.46000; -75.69361 (Trans-Peninsular Line Midpoint Marker)
Built	1763 (1763)
Built by	Charles Mason; Jeremiah Dixon
NRHP reference No.	75002101
Added to NRHP	February 18, 1975

The Delaware Boundary Markers historic district is located along the state boundary lines between Delaware and Maryland, and between Delaware and Pennsylvania. The district includes 94 contributing sites along the Mason–Dixon line and includes the Transpeninsular Line, Post Marked West site, Tangent Line, the Arc Corner, and the Twelve-Mile Circle.

The district was added to the National Register of Historic Places on February 18, 1975, for its significance in engineering and politics/government.

Description

The markers are mainly on three parts of the Delaware boundary. First, the southern boundary with Maryland along the Transpeninsular Line from Fenwick Island to the Midpoint Marker, the first crownstone set by Mason and Dixon. Second, the western boundary with Maryland from the Transpeninsular Line Midpoint Marker to the boundary with Pennsylvania at the Tri-State Monument. Third, the northern boundary with Pennsylvania, the Twelve-Mile Circle. In addition, the starting measurement point, the Post Marked West, and the boundary from the Arc Corner Monument to the Tri-State Monument are included in the district.

Gallery

• Delaware–Maryland–Pennsylvania Tri-State Monument
• Arc Corner Monument
• Post Marked West site

See also

• National Register of Historic Places listings in northern New Castle County, Delaware
• National Register of Historic Places listings in Sussex County, Delaware
• National Register of Historic Places listings in Cecil County, Maryland
• National Register of Historic Places listings in Wicomico County, Maryland
• National Register of Historic Places listings in southern Chester County, Pennsylvania

References

1. ^ "National Register Information System – (#75002101)". National Register of Historic Places. National Park Service. November 2, 2013.
2. ^ Heite, Edward F. (October 1974). "National Register of Historic Places Inventory/Nomination: Delaware Boundary Markers". With accompanying photo

External links

• Media related to Delaware Boundary Markers at Wikimedia Commons
• Wang, Lillian; Schenck, William. "Delaware Boundary Monuments". Journey to Mark the First State's Boundaries
• "Mason Dixon Line & the Boundaries of Delaware". Historical Marker Database.

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• Historic districts on the National Register of Historic Places in Delaware
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