There are 86 US Post Offices in Worcester County serving a total of 744,348 residents equating to 8,655 residents per post office. It's estimated that approximately 1,188,062 packages are handled across the 86 county post offices annually. Worcester County is a county located in the U.S. state of Massachusetts. As of the 2010 census, the population was 798,552, making it the second-most populous county in Massachusetts while also being the largest in area. The largest city and traditional county seat is the city of Worcester. Worcester County is included in the Worcester, MA-CT Metropolitan Statistical Area as well as the Boston-Worcester-Providence, MA-RI-NH-CT Combined Statistical Area."