There are 23 US Post Offices in Somerset County serving a total of 50,740 residents equating to 2,206 residents per post office. It's estimated that approximately 80,987 packages are handled across the 23 county post offices annually. Somerset County is a county located in the state of Maine, in the United States. As of the 2010 census, the population was 52,228. Its county seat is Skowhegan.