There are 13 US Post Offices in Snyder County serving a total of 35,674 residents equating to 2,744 residents per post office. It's estimated that approximately 56,940 packages are handled across the 13 county post offices annually. Snyder County is a county in the U.S. state of Pennsylvania. As of the 2010 census, the population was 39,702. The county seat is Middleburg. Snyder County was formed in 1855 from parts of Union County. Snyder County comprises the Selinsgrove, PA Micropolitan Statistical Area, which is also included in the Bloomsburg-Berwick-Sunbury, PA Combined Statistical Area."