Santa Clarita, officially the City of Santa Clarita, is the third largest city in Los Angeles County, California, United States and the eighteenth largest in the state of California. The city has annexed a number of unincorporated areas, contributing to the large population increase. It is located about 35 miles (56 km) northwest of downtown Los Angeles, and occupies most of the Santa Clarita Valley. It is a notable example of a U.S. edge city or boomburb. Santa Clarita was ranked by Money magazine in 2006 as 18th of the top 100 places to live. Santa Clarita was incorporated in December 1987 as the union of several previously existing communities, including Canyon Country, Newhall, Saugus, and Valencia, all of which are situated on the land of the former Rancho San Francisco. It is bounded on the west by the Golden State Freeway (I-5). The Antelope Valley Freeway (SR-14) runs northeast-southwest through an irregular east border, and the Newhall Pass is the city’s southernmost point. Santa Clarita is often associated with the Six Flags Magic Mountain amusement park, though the park is located just outside the city limits, and the California Institute of the Arts (CalArts), located in Valencia.