There are 20 US Post Offices in Chittenden County serving a total of 180,808 residents equating to 9,040 residents per post office. It's estimated that approximately 288,590 packages are handled across the 20 county post offices annually. Chittenden County /\u02c8t\u0283\u026at\u0259nd\u0259n/ is the most populous county in the U.S. state of Vermont. As of the 2010 census, the population was 156,545. The county's population estimate for 2015 was 161,382. Its shire town (seat) is Vermont's most populous municipality, the city of Burlington. The county has over a quarter of the state's total population and more than twice the population when compared to Vermont's second most populous county of Rutland. The county also has more than twice the population density when compared to Vermont's second most dense county of Washington. The county is named for Vermont's first governor and one of the framers of its Constitution as a Republic and state, Thomas Chittenden. The county has most of Vermont's fastest growing municipalities. It is one of the three counties that comprise the Burlington metropolitan area, along with the counties of Franklin and Grand Isle to the north and northwest, respectively. The University of Vermont (UVM), the state of Vermont's largest university, is located in the county, as well as its affiliated hospital, the UVM Medical Center (which is Vermont's largest hospital). The state's largest private employer (GlobalFoundries) and largest airport (Burlington International Airport) are located in the municipalities of Essex Junction and South Burlington, respectively. The Vermont National Guard is based in Colchester at Camp Johnson while their Air Guard is based at the Burlington International Airport. The county is contrasted with the much more rural character of the rest of the state."