There are 50 US Post Offices in Oneida County serving a total of 238,455 residents equating to 4,769 residents per post office. It's estimated that approximately 380,601 packages are handled across the 50 county post offices annually. Oneida County is a county located in the state of New York, in the United States. As of the 2010 census, the population was 234,878. The county seat is Utica. The name is in honor of the Oneida, an Iroquoian tribe that had this territory at the time of European encounter and has a reservation in the region. Oneida County is part of the Utica-Rome, NY Metropolitan Statistical Area."