Penbrook is a borough in Dauphin County, Pennsylvania, founded in 1861 and incorporated July 10, 1894. Penbrook was once named East Harrisburg and still maintains a Harrisburg postal ZIP code. The Mayor is Richard Stottlemyer. The population was 3,044 at the 2000 census. Penbrook apartments for rent comparison page shows most up to date rent information on Penbrook apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.