Murrieta is a city in southwestern Riverside County, California, United States. The population of Murrieta was 103,466 at the 2010 census. Murrieta experienced a 133.7% population increase between 2000 and 2010, according to the most recent census, making Murrieta one of the fastest growing cities in the state. This population boom in 2010 surpassed the population of the historically larger and more commercial city of Temecula to the south for the first time since the incorporation of either city. Temecula and Murrieta together form the southwestern anchor of the Inland Empire region. The Murrieta-Temecula-Menifee Urban Area had a population of 441,546 at the 2010 Census.