Tri-State Mason Dixon Marker
- Also Known As: Mason-Dixon Post Marked West
- Address: 1475 Creek Rd
- Vicinity: N of New London Rd, trail from White Clay Creek State Park Nature Center
The Tri-State Mason Dixon Marker is a stone post in New Castle County, Delaware, that historically marks the dividing point between Delaware, Maryland and Pennsylvania.
The post can by reached by a trail starting in the Friends of the White Clay Creek Preserve's Arc Corner parking lot, off Chambers Rock Road in Pennsylvania, and ends at the Tri-State Marker. The land on the Delaware and Maryland sides are privately owned. - AsNotedIn