Penbrook (Jonestown – 23) COORDINATES: 40.275038, -76.854684 COUNTY: Dauphin DISTANCE TO NEXT: Jonestown - 23 EXPLANATION OF NAME: Formerly East Harrisburg FOUNDED: Incorporated 1894 MANUFACTURER: None SHAPE: Standard 1-sided STATUS: Penbrook is now a part of the city of Harrisburg. This marker shows "Incorporated" instead of "Founded". August 2010 photo by Jack Graham Marker as illustrated in the 1943 PA Dept. of Highways “Manual of regulations for Official Traffic Signs and Signals.” May 2014 photo by Jim Carn May 2014 photo by Jim Carn Walnut at Hoffer Streets