what is county mertztown in
Mertztown, Pennsylvania. Mertztown is a census-designated place in Longswamp Township, Berks County, Pennsylvania. It is located near the borough of Topton. As of the 2010 census, the population was 664 residents. Mertztown is located in Berks County at latitude 40.506 and longitude -75.665 (Mertztown Panoramio Photos.) and its elevation is 466 feet.