There are 11 US Post Offices in Montgomery County serving a total of 52,785 residents equating to 4,799 residents per post office. It's estimated that approximately 84,251 packages are handled across the 11 county post offices annually. Montgomery County is a county located in the U.S. state of New York. As of the 2010 census, the population was 50,219. The county seat is Fonda. The county was named in honor of Richard Montgomery, an American Revolutionary War general killed in 1775 at the Battle of Quebec. It was created in 1772 as Tryon County and in 1784 was renamed Montgomery County. Montgomery County comprises the Amsterdam, NY Micropolitan Statistical Area. The county borders the north and south banks of the Mohawk River."