Suffolk County, NY Population: 1.525 Million (2021)

Per U.S. Census Bureau, Suffolk County (Long Island) population was 1,525,106 as of July 1, 2021.

Context

• 4th most populous NY county (after Kings, Queens, Nassau)
• Largest by area (912 sq mi / 2,360 km²)
• Easternmost Long Island county
• Major towns: Islip, Babylon, Brookhaven, Huntington, Smithtown
• Mix of suburban, coastal, and rural (East End) communities