Ulster County is a county located in the U.S. state of New York.

As of the 2010 census, the population was 182,493.

The county seat is Kingston.

The county is named after the Irish province of Ulster.

Area: 1,161 mi²

Population: 179,417 (2017)

County seat: Kingston

Point of interest: Minnewaska State Park Preserve

State College: State University of New York at New Paltz (SUNY Ulster)