High Quality Content by WIKIPEDIA articles! Valencia is an affluent planned community located in the City of Santa Clarita, California and Los Angeles County, California in the northwestern corner of the Santa Clarita Valley, adjacent to Interstate 5. In 1987, it was one of the four unincorporated communities (along with Saugus, Newhall, and Canyon Country) that merged to create the city of Santa Clarita, California. Santa Clarita is ranked as one of the top 100 places to live by Money.