340 Area Code: The US Virgin Islands' Only Prefix

Introduction

No daylight saving clock changes. No overlay code crowding the map. Just one prefix covering three islands and every business trying to reach them. That's the 340 area code, the US Virgin Islands' single telephone identity since 1997.

If you're building a presence in St. Thomas, St. Croix, or St. John, this code carries weight most mainland numbers can't match. Here's what it covers, how it got its own line, and how to claim one today.

What Is the 340 Area Code?

The 340 area code is the telephone prefix for the entire US Virgin Islands, a US territory in the Caribbean that runs on the North American Numbering Plan just like any state. One code, three main islands, zero splits since it launched.

That makes a 340 area code number instantly recognizable across the territory — there's no ambiguity about which island a caller might be reaching from, and no second code to explain to anyone. The area codes directory guide covers the neighbouring ground.

Where the 340 Area Code Reaches

This prefix covers St. Thomas, St. John, St. Croix, and Water Island, taking in the territory's four largest population centers along the way.

The Islands and Cities Inside It

Charlotte Amalie on St. Thomas serves as the territorial capital and busiest cruise port in the Caribbean. Christiansted and Frederiksted anchor St. Croix, the largest of the islands by land area.

Cruz Bay rounds out St. John, home to most of the Virgin Islands National Park and a smaller, quieter island economy built almost entirely around tourism.

One Code for a Whole US Territory

Here's what separates the area code 340 story from most mainland codes: it's never needed a split or an overlay in nearly three decades of service. A modest year-round population keeps demand well within a single code's capacity.

That stability is unusual even by territory standards — Puerto Rico, by comparison, has needed multiple overlay codes for its much larger population. The West Virginia's 681 guide covers the neighbouring ground.

A Quick History of the 340 Area Code

The 340 area code was created by a split from the Caribbean numbering plan area formerly covered by 809, going into service June 1, 1997. That older 809 code had covered most of the English-speaking Caribbean, and its own number supply was running out fast.

Splitting the Virgin Islands off with dedicated digits solved two problems at once — it relieved pressure on 809 and gave the territory its own numbering identity for the first time. The territory's official government portal at vi.gov carries the public records and business resources tied to that history.

A Young Code With an Old Job

Nearly three decades later, 340 still does exactly what it was built for. Every phone number issued in the territory since 1997 has carried these same three digits, with no fragmentation since.

That continuity matters for businesses: a 340 line issued today reads exactly the same as one issued the year the code launched.

Calling and Time Zones in the 340 Area Code

The 340 area code runs on Atlantic Standard Time year-round, a fixed UTC−4 offset with no daylight saving clock changes. That's one hour ahead of Eastern Time in winter and level with it in summer.

How to Dial It

From the US mainland, dial 1, then 340, then the seven-digit number — the territory is treated as a domestic US call, not international, despite the ocean between it and Florida.

International callers outside North America dial their exit code, then country code 1, then the full ten-digit number, exactly as they would for any US state.

Domestic Rates, Caribbean Location

Because the territory sits inside the North American Numbering Plan, most US mobile plans treat a call there as ordinary domestic minutes rather than an international toll. That's a genuine cost advantage for any business coordinating across the mainland and the islands. letsdial's area codes directory lays out local number options across every region in full.

The single fixed time offset helps too — with no daylight saving shuffle, scheduling a call between the mainland and the islands never drifts by an unexpected hour.

Who Leans on a Virgin Islands Line

The businesses that get the most from a local territory number tend to live on tourism and cross-border trade, where a familiar prefix turns an inquiry into a booking.

Charter and Hospitality Operators

Sailing charters, dive shops, and villa-rental managers depend on returning guests who booked a previous season. A recognizable local number on a confirmation reads as the same trusted operator, not a distant call center.

Cruise-Port Retail and Services

Charlotte Amalie handles some of the busiest cruise traffic in the Caribbean, and the retail and excursion businesses around the port lean on local numbers to convert walk-up interest into repeat bookings.

Mainland Firms With Island Operations

Companies drawn by the territory's tax incentives often run a genuine island presence alongside a mainland office. A local number roots them in the community rather than flagging them as outsiders.

Why the 340 Area Code Still Matters for Business

Tourism drives most of the territory's economy, and a recognizable local number matters enormously for booking agents, charter operators, and hospitality businesses trying to convert an inquiry into a reservation.

Tourism, Trade, and Tax Incentives

Cruise-port retail, charter sailing, and resort hospitality make up the bulk of Virgin Islands commerce, and repeat visitors trust an area code 340 line the same way mainland customers trust a hometown prefix. The territory's Economic Development Commission also offers meaningful tax incentives that draw mainland companies to open a genuine island presence.

For any business courting that tourism dollar, the code itself is part of the pitch.

Local Presence Without Relocating

A cloud-based line lets a mainland team answer as a Virgin Islands business without physically moving anyone to the territory. That's exactly what a virtual business number is built to solve.

Every call answered under a 340 number gets transcribed automatically on every paid letsdial tier, so nothing from a booking conversation gets lost afterward.

How to Get a 340 Area Code Number

Setting up a Virgin Islands line no longer requires a physical presence on the islands or a lengthy carrier application. Through a cloud platform, you choose a local Virgin Islands number and start taking calls the same day.

letsdial ports numbers in free and out free, with local coverage across 100+ countries. Mainland companies pairing a Virgin Islands line with a statewide number like West Virginia's 681 use the same setup to run both from one dashboard.

What's Included on Every Plan

One login covers calling into 200+ countries, shared team SMS, HD video, and an AI receptionist that answers and books with zero per-minute AI fees. Compliance — SOC 2 Type II, HIPAA-ready — stays identical across every plan.

Median setup runs under three minutes. Start the 14-day trial, no credit card required, and a Virgin Islands presence can be live before your next booking window opens. That record is published in full as government portal at vi.gov.

The Bottom Line on the Territory's Only Prefix

Three islands, one code, and nearly thirty years without a single split — area code 340 has earned the kind of local trust that only comes from total consistency.

Claim a Virgin Islands line, point it at your team, and let that unbroken history do the trust-building for your business. On islands where tourism runs on repeat guests and word of mouth, a number visitors already recognize is worth far more than any generic toll-free line.

Frequently Asked Questions