There are 20 US Post Offices in Erie County serving a total of 132,289 residents equating to 6,614 residents per post office. It's estimated that approximately 211,148 packages are handled across the 20 county post offices annually. Erie County is a county located in the U.S. state of Pennsylvania. As of the 2010 census, the population was 280,566. Its county seat is Erie. The county was created in 1800 and later organized in 1803. Erie County comprises the Erie, PA Metropolitan Statistical Area."