There are 7 US Post Offices in Lyon County serving a total of 57,885 residents equating to 8,269 residents per post office. It's estimated that approximately 92,391 packages are handled across the 7 county post offices annually. Lyon County is a county located in the U.S. state of Nevada. As of the 2010 census, the population was 51,980. Its county seat is Yerington. Lyon County includes the Fernley, NV Micropolitan Statistical Area, which is part of the Reno-Carson City-Fernley, NV Combined Statistical Area."