LaGrange is a town in Dutchess County, New York, United States. The population was 15,975 at the 2020 census. The town was named after the estate of the Marquis de Lafayette.

Dutchess County is a county in the U.S. state of New York. As of the 2020 census, the population was 295,911. The county seat is the city of Poughkeepsie. The county was created in 1683, one of New York's first twelve counties, and later organized in 1713. The county is part of the Hudson Valley region of the state.