What county is Santa Clarita CA in

Santa Clarita city is located Los Angeles County.

Santa Clarita, founded in 1987, is a U.S. city in Los Angeles County in the U.S. state of California. As of the 2010 United States Census Bureau, it had a population of 177,641 and a population density of 1,219.6 people per km2, being one of the fastest growing localities in the State of California.