- COORDINATES: 39.798641, -77.725779
- COUNTY: Franklin
- DISTANCE TO NEXT: Hagerstown - 11
- EXPLANATION OF NAME: Named for Greencastle In North of Ireland
- FOUNDED: 1750
- MANUFACTURER: Unknown
- SHAPE: Standard 1-sided
- STATUS: Still standing as of January 2016

Photo June 2010 by J. Graham

January 2016 photo by Mike Wintermantel

January 2016 photo by Mike Wintermantel
US 11 at Green Castle Market Place