Rehrersburg is a location in Tulpehocken Township in northwestern Berks County, Pennsylvania. Rehrersburg was founded on April 4, 1803, by John Jacob Rehrer. Residents celebrated the towns's on Saturday, September 20, 2003. In 1818, the sixth post office in the county opened in Rehrersburg. Rehrersburg's zip code is 19550. John Jacob Rehrer was the son of Johan Gottfried Rehrer and Maria Magdalena (Etschberger) Rehrer. Many descendants of the Rehrer family still reside in Rehrersburg.