424 Area Code: Los Angeles Cities, History & How to Get One

Introduction

The 424 area code is the calling prefix for West Los Angeles, one of the most commercially powerful and recognizable telephone regions in the United States. Knowing this code helps you identify local callers, plan smarter business outreach, and connect with one of America's most dynamic metro areas. In this guide, you will learn which cities it covers, what time zone it follows, the full story behind its 2006 launch, and the fastest way to get a local number. Whether you are researching an incoming call or building a West LA presence for your brand, this is the complete resource you need.

What Is the 424 Area Code?

The 424 area code is a North American Numbering Plan (NANP) prefix assigned to the western and southwestern portions of Los Angeles County, California. It functions as an overlay for the 310 area code — meaning both codes cover the same geographic territory simultaneously, with no dividing boundary between them.

A caller with a 424 prefix is in the same West LA zone as a caller with a 310 prefix. The two codes coexist because the 310 territory ran out of available number combinations and needed a second prefix to handle continued subscriber growth across the region.

Where Is the 424 Area Code Located?

The coverage zone spans the western and southwestern portions of Los Angeles County, stretching from Malibu and Santa Monica in the north and west, south through the South Bay to Torrance and Gardena, and inland through Culver City and Inglewood. For neighboring SoCal coverage, the 949 area code guide covers Orange County just to the south.

Key Cities in the 424 Coverage Zone

The region also contains LAX — one of the world's busiest international airports — and serves as the corporate heartland of the global entertainment, aerospace, and technology industries.

Time Zone for the 424 Region

Every community in the 424 zone follows the Pacific Time Zone. From early November to mid-March, the region observes Pacific Standard Time (PST, UTC−8). From mid-March to early November, it shifts to Pacific Daylight Time (PDT, UTC−7).

West LA runs three hours behind the Eastern Time Zone and one hour behind Mountain Time. If you are calling from New York at 9:00 a.m., it is only 6:00 a.m. in Beverly Hills — a detail that matters when booking client calls, pitching investors, or coordinating remote teams.

California observes no split zones, so every city in the 424 footprint — from Malibu to Gardena — runs on the same Pacific clock year-round. This consistency keeps scheduling straightforward for teams operating across the West LA market.

History of the 424 Area Code

The story of this West LA code begins with its predecessor. The 310 area code launched in 1991, carved out of the original 213 code to serve the booming population of West Los Angeles. Within fifteen years, the explosive growth of mobile phones, pagers, internet dial-up connections, and corporate PBX systems had consumed nearly every available 310 combination.

In 2006, the California Public Utilities Commission (CPUC) approved 424 as a mandatory overlay. Rather than splitting the region and forcing millions of residents and businesses to change their numbers, regulators chose the overlay route. New subscribers and companies received 424 numbers while existing 310 customers kept their lines untouched. The launch also ended 7-digit local dialing across the zone — a shift that became the new normal for all US local numbers operating in overlay territories.

The 310/424 Overlay Explained

An overlay occurs when two or more area codes share the exact same geographic territory. The 310/424 overlay is one of the most widely recognized on the US West Coast. Both codes are local to West LA — no address or ZIP code belongs exclusively to 310 and not 424.

The practical effect is mandatory 10-digit dialing. Before 424 arrived, locals could dial just 7 digits for a local call. The overlay made that impossible — the system could no longer determine which area code a 7-digit number belonged to. National FCC guidelines require full 10-digit dialing in every overlay region to prevent misrouting and call failures.

Spotting a 424 code on caller ID means the caller is in the same West LA service area as any 310 number. The only real difference is timing — 310 numbers pre-date 2006 and 424 numbers post-date the overlay launch.

How to Dial a 424 Phone Number

Reaching any 424 phone number from inside the United States is straightforward. Dial the full 10-digit number — 424 followed by the 7-digit local number. No "1" prefix or special access code is needed for domestic calls.

International callers use their country's exit code (011 from the US, 00 from most of Europe), then 1 for the United States, then the full local number. VoIP users and virtual number holders follow exactly the same sequence from any internet-connected device worldwide.

Industries & Economy in the 424 Region

This West LA region sits at the center of some of California's most productive economic sectors. West Los Angeles drives enormous commercial activity across entertainment, aerospace, technology, and international trade — making this one of the most valuable local phone markets in the country.

• Entertainment & media: Culver City, Beverly Hills, and the broader 424 corridor host major studio campuses. Amazon Studios, Apple TV+, Sony Pictures, and MGM all maintain flagship operations here.
• Aerospace & defense: El Segundo and the South Bay cluster are home to Boeing, Raytheon, and Northrop Grumman — a legacy of post-WWII defense contracts that still supports tens of thousands of regional jobs.
• Technology: Santa Monica and Playa Vista form the heart of "Silicon Beach," where Snap Inc., Google, and hundreds of venture-backed startups cluster within blocks of the Pacific Ocean.
• New space: Hawthorne hosts SpaceX's global headquarters and rocket manufacturing facility — one of the most recognizable corporate addresses in any US calling zone.
• Logistics & trade: LAX — one of the world's busiest airports — sits inside the 424 footprint, anchoring cargo operations, passenger services, and a vast network of supply-chain companies.
• Healthcare: Cedars-Sinai Medical Center, Torrance Memorial, and multiple research institutes across the South Bay serve the region's two million-plus residents.

Businesses targeting any of these sectors — whether you are a recruiter, vendor, or remote service provider — gain immediate credibility from a local number that signals real market presence in West LA.

How to Get a Virtual Phone Number from CallMama

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Why a West LA Number Helps Your Business

A local West LA number carries real weight with customers, partners, and investors across this market. Research consistently shows that people are far more likely to answer calls from a familiar local prefix than from an unfamiliar out-of-state number.

• Higher answer rates: a 424 prefix looks local to every Beverly Hills and Santa Monica contact on your list, improving pickup rates significantly over national numbers.
• Market credibility: studios, tech firms, and aerospace contractors in the 424 zone trust local lines more readily than distant call centers or toll-free numbers.
• Cost efficiency: a virtual number removes the need for a physical LA office while delivering the same local market presence at a fraction of the overhead.
• Privacy protection: keep your personal mobile unlisted while advertising a professional 424 code number on all public listings and marketing materials.

Startups pitching to Beverly Hills investors, talent agencies reaching out to clients, e-commerce brands targeting affluent West LA households, and international companies entering the LA market all gain a competitive edge from a recognizable local prefix. Whether you are based in Austin, London, or Singapore, a virtual West LA number signals presence where it counts most.

Conclusion

The 424 area code is more than a dialing prefix — it is the calling identity of West Los Angeles, connecting Beverly Hills, Santa Monica, Silicon Beach, and the South Bay to the rest of the world. From its 2006 launch as a 310 overlay to its current role powering entertainment studios, aerospace leaders, and the new-space industry, this code represents one of the most commercially significant phone zones in the United States. You now know its cities, time zone, full history, and 10-digit dialing rules — everything needed to use the local prefix with real confidence.

Getting a local West LA number has never been more straightforward. A virtual 424 number puts your business at the heart of LA without a costly office lease or California residency requirement. Choose a plan, pick your number, and go live in minutes. Your West LA market presence is ready whenever you decide to claim it.