There are 14 US Post Offices in Herkimer County serving a total of 57,298 residents equating to 4,093 residents per post office. It's estimated that approximately 91,454 packages are handled across the 14 county post offices annually. Herkimer County is a county located in the U.S. state of New York. As of the 2010 census, the population was 64,519. Its county seat is Herkimer. The county was created in 1791 north of the Mohawk River out of part of Montgomery County. It is named after General Nicholas Herkimer, who died from battle wounds in 1777 after taking part in the Battle of Oriskany during the Revolutionary War. Herkimer County is part of the Utica-Rome, NY Metropolitan Statistical Area."