There are 47 US Post Offices in Berks County serving a total of 330,709 residents equating to 7,036 residents per post office. It's estimated that approximately 527,848 packages are handled across the 47 county post offices annually. Berks County (Pennsylvania German: Barricks Kaundi) is a county located in the U.S. state of Pennsylvania. As of the 2010 census, the population was 411,442. The county seat is Reading. Berks County comprises the Reading, PA Metropolitan Statistical Area (MSA), which is also included in the Philadelphia-Reading-Camden, PA-NJ-DE-MD Combined Statistical Area. (CSA)."