Area code 310 covers the west and southwestern parts of Los Angeles County, California. Established in 1991, it is overlaid by area code 424. This region includes some of the most iconic parts of L.A., including Santa Monica, a beachfront city famous for its pier, upscale dining, and shopping along Third Street Promenade. With its mix of coastal beauty, tech industry presence, and cultural flair, Santa Monica epitomizes the Southern California lifestyle.