There are 10 US Post Offices in Cortland County serving a total of 49,395 residents equating to 4,940 residents per post office. It's estimated that approximately 78,840 packages are handled across the 10 county post offices annually. Cortland County is a county located in the U.S. state of New York. As of the 2010 census, the population of Cortland County was 49,336. The county seat is Cortland. The county is named after Pierre Van Cortlandt, president of the convention at Kingston that wrote the first New York State Constitution in 1777, and first lieutenant governor of the state. Cortland County comprises the Cortland, NY Micropolitan Statistical Area, which is also included in the Ithaca-Cortland, NY Combined Statistical Area. The Cortland apple is named for the county."