Nassau County is a suburban county on 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 1,358,627 in 2014. The county seat is located in the Village of Garden City, within the boundaries of the Mineola 11501 zip code. The name of the county comes from an old name for Long Island, which was at one time named Nassau, after the Dutch Prince William of Nassau, a member of the House of Nassau, itself named for the German town Nassau. The county colors (orange and blue) are also the colors of the House of Orange-Nassau.