- COORDINATES: 39.787868, -77.717564
- COUNTY: Franklin
- EXPLANATION OF NAME: Named for Greencastle In North of Ireland
- FOUNDED: 1750
- MANUFACTURER: Carlisle Foundry Co
- SHAPE: Standard 1-sided
- STATUS: This town, at the intersection of a U.S. numbered route and a PA numbered route still has all four of these original markers. Few towns have more than one remaining.
Photo: July 2008 by Clair Clawser
photo: May 2011 by Mike Natale.
January 2016 photo by Mike Wintermantel
PA 16 (Baltimore Street) at east end of town