There are 23 US Post Offices in Hampshire County serving a total of 176,513 residents equating to 7,674 residents per post office. It's estimated that approximately 281,734 packages are handled across the 23 county post offices annually. Hampshire County is a historical and judicial county located in the U.S. state of Massachusetts. It has no county government. Instead there is a Hampshire Council of Governments. As of the 2010 census, the population was 158,080. Its most populous municipality is Amherst, and its county seat is Northampton. The county is named after the county Hampshire, in England. Hampshire County is part of the Springfield, MA Metropolitan Statistical Area."