Nassau County is a suburban county comprising much of western Long Island in the U.S. state of New York. At the 2010 census, the county’s population was 1,339,532, estimated to have increased to 1,369,514 in 2017. The county seat is in the Village of Garden City within the boundaries of the Mineola 11501 zip code.
Nassau County is directly east of New York City limits and therefore also within the New York metropolitan area. The county is one of the four counties that occupy Long Island, together with Suffolk County to its immediate east and Queens and Kings counties to the west, which correspond, respectively, to the New York City boroughs of Queens and Brooklyn. Two cities, three towns, 64 incorporated villages, and more than 60 unincorporated hamlets are located within the county. There are 56 public school districts within the county. Post office districts and school districts use the same names as a city, hamlet, or village within them, but each sets the boundaries independently.