There are 13 US Post Offices in Skagit County serving a total of 101,904 residents equating to 7,839 residents per post office. It's estimated that approximately 162,650 packages are handled across the 13 county post offices annually. Skagit County /\u02c8sk\u00e6d\u0292\u1d7bt/ is a county in the U.S. state of Washington. As of the 2010 census, the population was 116,901. The county seat and largest city is Mount Vernon. The county was formed in 1883 from Whatcom County and is named for the Skagit Indian tribe, which has been indigenous to the area prior to European-American settlement. Skagit County comprises the Mount Vernon-Anacortes, WA Metropolitan Statistical Area, and is included in the Seattle-Tacoma, WA Combined Statistical Area. It is located in the Puget Sound region."