424 Area Code: A Complete Guide to Los Angeles' Westside and South Bay

Introduction

Few places on earth are as instantly recognizable as the western edge of Los Angeles — the palm-lined streets of Beverly Hills, the pier at Santa Monica, the surf breaks of Malibu and the tight grid of beach towns strung along the South Bay. For decades this stretch of coast has answered the phone as 310, one of the most desirable area codes in the country. But numbers, like real estate here, eventually run short. When 310 began to run low, California reached for a brand-new kind of fix — an overlay — and the 424 area code was born. This guide explains exactly where 424 reaches, why it shares every street with 310, how it changed the way the whole region dials, and how any business can claim a local Los Angeles number of its own.

What Is the 424 Area Code?

The 424 area code is the second telephone code for the Westside and South Bay of Los Angeles — the coastal and western communities that have long been served by the 310 area code. It is not a separate region with its own map; it is an overlay, meaning 424 numbers ring on the very same streets as 310 numbers. When it launched in 2006 it was the first overlay ever used in California, a model that has since spread to fast-growing metros across the state and the West. If you hold a 424 line, you are in exactly the same place as a 310 line — the two are interchangeable.

Because it belongs to one of the world's best-known cities, a 424 number reads as unmistakably Los Angeles to customers everywhere. To someone on the Westside it looks like a genuine local on the caller ID rather than an out-of-town stranger, and to a customer across the country it still signals a real presence in one of America's biggest and most influential markets — a small but powerful credibility signal for any company.

Geographic Coverage and the Cities It Serves

The 424 code sits directly on top of 310, so it covers the Westside and South Bay of Los Angeles County together with a small piece of Ventura County and Santa Catalina Island offshore. It is a compact, coastal and famously affluent slice of the region — and every community inside it shares in the Los Angeles identity. The major communities include:

• Beverly Hills, Santa Monica, Malibu and Pacific Palisades — the celebrated Westside communities along and above the coast.
• Culver City, Marina del Rey, Venice and Playa del Rey — the creative and waterfront neighborhoods between the Westside and the airport.
• Inglewood, Hawthorne, El Segundo and Gardena — the communities around Los Angeles International Airport and the aerospace corridor.
• Manhattan Beach, Hermosa Beach, Redondo Beach and Torrance — the heart of the South Bay and its string of beach cities.
• The Palos Verdes Peninsula, San Pedro, Wilmington and Carson — the harbor communities and the hills above the Port of Los Angeles.
• Avalon and Santa Catalina Island — the resort town and island 26 miles off the coast that share the same codes.

Packed into that footprint are well over a million residents plus one of the densest concentrations of entertainment, aerospace, technology, tourism and international trade anywhere in the country — which is exactly why the region needed a second area code even after decades of using 310.

Time Zone and How to Dial

The entire 424 region sits within Pacific Time — UTC-8 in winter (PST) and UTC-7 in summer (PDT) — the same clock as San Francisco, Seattle and the rest of the West Coast, three hours behind New York. Because 424 shares its territory with 310, one everyday habit is different here than in single-code regions: ten-digit dialing is mandatory for every call, even a call to your next-door neighbor.

• Local calls within West LA and the South Bay: because 424 shares its area with 310, you must dial all ten digits — 424-555-0184 — for every local call.
• Long-distance from elsewhere in the U.S.: add a leading 1 — 1-424-555-0184.
• International: dial your country's exit code, then +1, then the number — +1 (424) 555-0184.
• On mobile phones: cell numbers are already stored and dialed with all ten digits, so most people reach 424 lines the same way from anywhere.

How 424 Was Created: The Overlay of 310

To understand 424 you first have to understand 310. When the North American numbering plan launched in 1947, all of Los Angeles answered as 213. As the metro exploded, that single code could not keep up, and on November 2, 1991, the Westside and South Bay split off into a brand-new area code, 310. For a while 310 had numbers to spare, but the same growth that filled 213 eventually filled 310 too — and this time regulators chose a different path.

Rather than split the Westside and South Bay again — which would have forced half the region onto a new number — California introduced its first-ever overlay. On July 26, 2006, the 424 area code was layered directly over the same territory as 310, adding a fresh supply of numbers without changing a single existing line. It was the same solution later used across the country whenever a beloved code ran short, from Atlanta's 470 area code to countless other metros. The one trade-off is ten-digit dialing for everyone, but no one ever had to give up a 310 number — which is a big part of why the region still feels like a single, unbroken 310/424 community today.

Benefits of a Local 424 Number for Business

A local number is one of the simplest trust signals a business can own, and few carry the weight of a Los Angeles line. When someone sees a 424 or 310 number calling, it reads as an established Westside or South Bay presence — not an out-of-area cold caller. In one of the world's largest and most competitive markets, that instant recognition is worth a great deal.

• Instant local credibility — a 424 caller ID signals that you are part of the Los Angeles business community, whether you are on the Westside or serving it from elsewhere.
• Higher answer rates — people are far more likely to pick up a call from a familiar local code than an unknown or toll-free number.
• A recognizable Los Angeles identity — 424 shares the prestige of 310, lending real credibility to a young company and a national brand alike.
• Flexibility without a Westside office — cloud calling means you can hold a 424 number from anywhere and still ring and receive calls as a local business.
• Easy tracking and scaling — add lines, route calls and measure campaigns without ever changing the local number your customers already know.

How to Get a 424 Phone Number

You no longer need a phone company truck or a physical office in Los Angeles to own a 424 line. With a cloud phone provider the whole thing is handled online, and a new number can be live the same day. Because the Westside and South Bay are in such high demand, the sooner you claim one the better — but the steps are straightforward:

• Choose a cloud phone provider — pick a virtual phone service that offers 424 numbers and the features your team needs.
• Select your 424 number — search the available inventory and claim a number that suits your business, or port one you already use.
• Set up routing and features — point calls to your team, add voicemail, an auto-attendant, business hours and call forwarding.
• Start calling — make and receive calls from a laptop, desk phone or mobile app, showing your local 424 identity every time.

Spotting and Avoiding 424 Scam Calls

A local area code builds trust, and unfortunately scammers know it. "Neighbor spoofing" makes a fraudulent call appear to come from a nearby 424 number so it looks safe to answer. A few habits keep you a step ahead:

• Watch for pressure and urgency — real agencies and businesses do not demand that you act "right now" or the account will be closed.
• Be wary of odd payment demands — gift cards, wire transfers and cryptocurrency are the calling cards of a scam, never a legitimate bill.
• Do not trust caller ID alone — a 424 number on the screen can be faked; the local code is no guarantee the caller is who they claim.
• Hang up and call back on a number you trust — reach the bank, utility or agency directly using a number from a statement or official website.
• Report the call — logging unwanted calls with the authorities helps regulators track and shut down the operations behind them.

The Future of the 424 Area Code

With 424 overlaying 310 since 2006, the Westside and South Bay now have a deep, shared pool of numbers to draw on, so another split is off the table — the region will keep its exact footprint indefinitely. The bigger story is demand: because 310 numbers are scarce and prized, most new lines are now issued as 424, and the two codes will keep working side by side. The City of Los Angeles remains one of the largest business, entertainment and trade hubs in the world, and its appetite for phone numbers keeps growing, which is exactly why the overlay was needed. For a business, the takeaway is simple: a local 424 number gives you an authentic Los Angeles presence today, and it will read as genuinely local for many years to come.

Conclusion

The 424 area code is far more than three digits — it is the second phone identity of Los Angeles' Westside and South Bay, from the hills of Beverly Hills and the sand at Santa Monica to the beach cities of the South Bay and the harbor at San Pedro. Born in 2006 as California's first overlay, it shares every street with the storied 310 and secured the region's future without forcing anyone to change their number. For any business hoping to connect with the Los Angeles market, a local 424 number is one of the most recognizable and authentic ways to belong.