Holladay is a city in central Salt Lake County, Utah, United States. It is part of the Salt Lake City, Utah Metropolitan Statistical Area and abuts the Wasatch National Forest. The population was 31,965 at the 2020 census, a significant increase from 14,561 in 2000 when the area first incorporated from Salt Lake County, this is due to the annexation of unincorporated land in 2002 and again in 2015. The city was incorporated on November 29, 1999. It was reported in the 1990 census as the Holladay-Cottonwood CDP.