The Mason and Dixon Line Preservation Partnership (MDLPP) will unveil a Crown
Stone set on the border of Maryland and Pennsylvania by Charles Mason and Jeremiah
Dixon, 250 years ago. The Crown Stone was lost and had not been seen for over 110
years. A replica Crown Stone, showing how the original stone looked when it was set, will
also be unveiled.
When: 10 a.m. on Saturday, May 21
Where: At the State line at PA State Route 24 / Maryland Route 23. Latitude/Longitude:
39.721001 -76.543333. Between Norrisville, Maryland and Stewartstown, Pennsylvania.
Who: For the State of Maryland, Harford County Executive Barry Glassman.
For the State of Pennsylvania, York County Commissioners Susan Byrnes, Doug Hoke and Chris Reilly.
For the MDLPP, Todd Babcock and Patrick Simon.
From November 1763 to September 1768, Mason and Dixon surveyed the border between the provinces of
Maryland and Pennsylvania. They set carved limestones, with a “P” on the Pennsylvania side and a “M” or the
Maryland side every mile along the boundary. Every fifth mile they set a Crown Stone with the Calvert family crest
of the Maryland side and the Penn family crest of the Pennsylvania side. This Crown stone in numbered 40, as it is
40 miles west of the northeast corner of Maryland.
Crown Stone 40 has some very interesting history associated with the reason it has been lost for over 110 years.
This history has made this Crown Stone unique from all the other stones Mason and Dixon set on the
Pennsylvania and Maryland border.
Visuals: The 250 year old Crown Stone and replica Crown Stone will be revealed at this event. Another Crown
Stone, located about 150 feet away, that was set during a 1902 U.S. Coast and Geodetic Survey of the line will be
visible. The actual location of additional posts set by Mason & Dixon to allow them to place the Crown Stone.