There are 35 US Post Offices in Dutchess County serving a total of 340,963 residents equating to 9,742 residents per post office. It's estimated that approximately 544,215 packages are handled across the 35 county post offices annually. Dutchess County is a county located in the southeastern portion of the U.S. state of New York. As of the 2010 census, the population was 297,488. The county seat is Poughkeepsie. The county was created in 1683 and later organized in 1713. Dutchess County is part of the New York-Newark-Jersey City, NY-NJ-PA Metropolitan Statistical Area. It is located in the Mid-Hudson Region of the Hudson Valley."