The Town of Oyster Bay is a town in Nassau County, New York, it is the easternmost of the three towns which make up Nassau County, New York. Part of the New York metropolitan area, it is the only town in Nassau County to extend from the North Shore to the South Shore of Long Island.
The town of Oyster Bay comprises 18 villages and hamlets. The town has an area of 169.5 square miles (439 km2), 104.4 square miles (270 km2) of which is land and 65.1 square miles, or 38% water.
As of the 2020 census, it had a population of 301,332. The population was 85% White (80% Non-Hispanic), 2.3% African American, 0.2 Native American, 9.1 Asian, 1 Pacific Islander, and 1 from other races; Hispanics or Latinos of any race were 7.5% of The Town of Oyster Bay.
The State University of New York at Old Westbury and the New York Institute of Technology (and its affiliated College of Osteopathic Medicine) are both located in the town. LIU Post, a private university with more than 8,500 undergraduate students in its LIU system, is located on the largest campus of Long Island University, in Brookeville.
The town of Oyster Bay was originally part of Queens County until the western portion of that county was amalgamated into New York City in 1898 and Nassau County was created a year later. In 1918, the community of Glen Cove was incorporated as a city and formed its own governing system separate from that of Oyster Bay. As the population grew from 40,000 to more than 290,000 from 1950 to 1990, housing replaced farmland as the main occupation of residents.