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818 refers to the area code that primarily covers the 260 square miles of the San Fernando Valley of Los Angeles, California. The area is bounded by the Santa Susana Mountains (northwest), Simi Hills (west), Santa Monica Mountains and Chalk Hills (south), Verdugo Mountains (east), and the San Gabriel Mountains (northeast). Area code 818 was created in a split from area code 213 on January 7, 1984.
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