Suffolk County, New York

Suffolk County () is the easternmost county in the U.S. state of New York. It is mainly located on the eastern end of Long Island, but also includes several smaller islands. According to the 2020 United States census, the county's population was 1,525,920 making it the fourth-most populous county in New York State, and the largest outside New York City. Its county seat is Riverhead, though most county offices are in Hauppauge. The county was named after the county of Suffolk in England, from where its earliest European settlers came.

Suffolk County incorporates the easternmost extreme of the New York City metropolitan area. The geographically largest of Long Island's four counties and the second-largest of the 62 counties in New York State, Suffolk measures 86 miles in length and 26 miles in width at its widest.