There are 31 US Post Offices in Hampden County serving a total of 384,509 residents equating to 12,404 residents per post office. It's estimated that approximately 613,719 packages are handled across the 31 county post offices annually. Hampden County is a non-governmental county located in the Pioneer Valley of the state of Massachusetts, in the United States. As of the 2010 census, Hampden County's population was 463,490. Its traditional county seat is Springfield, the Connecticut River Valley's largest city, and economic and cultural capital. Hampden County was split from Hampshire County in 1812, because Northampton, Massachusetts was made Hampshire County's \"shire town\" in 1794; however, Springfield\u2014theretofore Hampshire County's traditional shire town, dating back to its founding in 1636\u2014grew at a pace far quicker than Northampton and was granted shire town-status over its own, southerly jurisdiction. It was named for John Hampden. To the north of Hampden County is modern-day Hampshire County; to the west is Berkshire County; to the east is Worcester County; to the south are Litchfield County, Hartford County, and Tolland County in Connecticut. Hampden County is part of the Springfield, MA Metropolitan Statistical Area. It is the most urban county in Western Massachusetts. The Knowledge Corridor surrounding Springfield-Hartford is New England's second most populous urban area (after Greater Boston) with 1.9 million people."