There are 28 US Post Offices in Berkshire County serving a total of 129,355 residents equating to 4,620 residents per post office. It's estimated that approximately 206,465 packages are handled across the 28 county post offices annually. Berkshire County, pronounced /b\u0259rk\u0283\u0259r/, is a county located on the western edge of the U.S. state of Massachusetts. As of the 2010 census, the population was 131,219. Its largest city and traditional county seat is Pittsfield. The county was founded in 1761. Berkshire County comprises the Pittsfield, MA Metropolitan Statistical Area. The Berkshire Hills are centered on Berkshire County, and the county itself is often referred to simply as the Berkshires. It exists today only as a historical geographic region, and has no county government."