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 first area incorporated from Salt Lake County. The city was incorporated on November 29, 1999, as Holladay-Cottonwood, and the name was shortened to Holladay on December 14 of that year. It was reported in the 1990 census as the Holladay-Cottonwood CDP.

Cottonwood Heights is a city located in Salt Lake County, Utah, United States, along the east bench of the Salt Lake Valley. It lies south of the cities of Holladay and Murray, east of Midvale, and north of Sandy within the Salt Lake City, Utah Metropolitan Statistical Area. Originally a census-designated place (CDP), following a successful referendum in May 2004, the city was incorporated on January 14, 2005. The population, as of the 2020 census, was 33,617.