Nassau County is a county located in the U.S. state of New York. As of the most recent data available, the county has a population of approximately 1,334,544 people, with a population density of about 649.98 persons per square mile.
The county spans a total land area of 287.00 square miles (743.00 square kilometers). The administrative center and county seat is Mineola, which often serves as a hub for local governance and services. The largest city within the county by population is Oyster Bay.
Geographically, Nassau County experiences varied elevations, with its highest point at East Norwich 208 ft and its lowest point at Baldwin Harbor 0 ft. The region operates in the UTC-5.