The Town of Hempstead is located in western Nassau County, New York, occupying the southwestern part of the county, in the western half of Long Island. Twenty-two incorporated villages are completely or partially within the town. Hempstead's combined population was 759,757 at the 2010 Census, the majority of the population of the county and by far the most of any town in New York. Also, a village named Hempstead is within the Town.

The Town of North Hempstead is located in western Nassau County. It is one of three towns in Nassau County, New York, USA. As of the 2010 census, the town population was 226,322.

The Town of Oyster Bay is easternmost of the three towns in Nassau County. Part of the New York metropolitan area, it is the only town in Nassau County that extends from the North Shore to the South Shore of Long Island. As of the 2010 census, the town population was 293,214.