Commack (/KO-mack/ or /KOM-mack/) is a census-designated place (CDP) that roughly corresponds to the hamlet (unincorporated community) by the same name in the towns of Huntington and Smithtown in Suffolk County, New York, United States on Long Island. The CDP's population was 36,367 at the 2000 census.
According to the United States Census Bureau, the CDP has a total area of 12.1 square miles (31.2 km²), all land.
The name Commack comes from the Secatogue Indians who lived on the south shore between Copiague and Bayport. They named their northern lands in the center of the island Winnecomac meaning "Pleasant lands." This is what they must have thought when they looked over this area of flat lands with rich soil, and thick oak forests abounding with plants and wildlife. From the earliest days Commack was known for its fertile soil, abundance of game, and wood.