- COORDINATES: 40.899642, -77.166383
- COUNTY: Union
- DISTANCE TO NEXT: Mifflinburg - 6
- EXPLANATION OF NAME: Named for Colonel Hartley Who Owned the Land At Time Town Was Laid Out
- FOUNDED: 1793
- MANUFACTURER: Not noted on marker
- STATUS: Dec. 2010 photo by Clair Clawser shows sign really in need of care. Repainted, straightened and turned around to proper position August 2011 by Jim Carn.

Photo Dec. 2010 by Clair Clawser

Photo August 2011 by Jim Carn

Photo August 2011 by Jim Carn

Photo August 2011 by Jim Carn

March 2018 photo by J. Graham

September 2018 photo by Mike Wintermantel

Mar. 2024 photo by J. Graham
PA 45 at west end of town