There are 28 US Post Offices in Otsego County serving a total of 61,115 residents equating to 2,183 residents per post office. It's estimated that approximately 97,546 packages are handled across the 28 county post offices annually. Otsego County is a county located in the U.S. state of New York. As of the 2010 census, the population was 62,259. The county seat is Cooperstown. The name Otsego is from a Mohawk or Oneida word meaning \"place of the rock.\" Otsego County comprises the Oneonta, NY Micropolitan Statistical Area."