There are 27 US Post Offices in Allegany County serving a total of 47,606 residents equating to 1,763 residents per post office. It's estimated that approximately 75,984 packages are handled across the 27 county post offices annually. Allegany County is a county located in the Southern Tier of the U.S. state of New York. As of the 2010 census, the population was 48,946. Its county seat is Belmont. Its name derives from a Delaware Indian (Lenape) word, applied by European-American settlers of Western New York State, to a trail that followed the Allegheny River and then used for the county. The county is bisected by the Genesee River, flowing north to its mouth on Lake Ontario. During the mid-nineteenth century, the Genesee Valley Canal was built to link southern markets to the Great Lakes and Mohawk River. The county was also served by railroads, which soon superseded the canals in their capacity for carrying freight. Part of the Oil Springs Reservation, controlled by the Seneca Nation, is located in the county."