WHAT YOU NEED TO KNOW
Area code 310 serves the western and southern portions of Los Angeles County, California, including Los Angeles (Westside), Santa Monica, Beverly Hills, and Torrance. Established in November 1991 as a split from area code 213, it covers approximately 4 million residents and is the primary local code for the LA Westside and South Bay communities.
- Population: ~4 million residents in the coverage area
- Overlay: Overlay: 424 (added in 2006)
- Dialing: 10-digit dialing required
- Source Type: Local geographic code
Geographic Coverage
Area code 310 covers the western and southern sections of Los Angeles County. Its geographic footprint includes the Westside communities of Santa Monica, Culver City, and Malibu, as well as the South Bay cities of Torrance, Redondo Beach, Hermosa Beach, Manhattan Beach, El Segundo, Hawthorne, and Gardena. Inland portions of Los Angeles and the Palos Verdes Peninsula are also included. The code does not extend east into the San Gabriel Valley or north into the San Fernando Valley, which are served by different area codes.
Population and Business Context
The 310 coverage area is one of the most economically active markets in the United States. Key industries include entertainment, technology, aerospace, healthcare, and finance. Major employers include LAX-adjacent aerospace firms, studios in Culver City, and financial institutions in Century City. Beverly Hills and Santa Monica anchor a high-density retail and luxury goods market. The South Bay corridor hosts defense contractors and tech startups. Small and mid-sized businesses across service industries are heavily concentrated in this region.
Area Code History
Area code 310 was created on November 2, 1991, when it split from the original 213 area code, which had covered all of Los Angeles County since 1947. The split was driven by rapid growth in telephone demand across the Westside and South Bay. In 2006, the 424 area code was introduced as an overlay for the same geographic region to address number exhaustion. Both 310 and 424 now serve the same territory and require 10-digit dialing for all local calls.
How to Dial
All calls within the 310 area code require 10-digit dialing, meaning you must dial the full area code plus the 7-digit local number even for calls within the same area code. This rule applies because of the 424 overlay introduced in 2006. Long-distance calls to numbers outside the 310 or 424 region require dialing 1 followed by the full 10-digit number. This dialing format applies to both landline and mobile calls placed within California.
Need a 310 Number for Your Los Angeles Business?
Businesses operating on the LA Westside or in the South Bay can provision a local 310 tracking number through Convirza. A 310-prefix number signals local presence to customers in Santa Monica, Beverly Hills, Torrance, and surrounding communities. Convirza provisions trackable local numbers in any North American area code, making it straightforward to establish or expand your regional footprint. Every call to your 310 number is automatically scored, recorded, and attributed to its marketing source using dynamic number insertion (DNI). Calls route to any team member, office location, or call center based on rules you define. You get full visibility into which campaigns drive real phone leads, without manual tracking or guesswork.
750+ customers · 25 years of call data