671 Area Code: Guam's Only Area Code — Villages, Time Zone & Guide

The 671 area code is the number of Guam — the entire US territory, from the capital of Hagåtña to the resort strip at Tumon Bay to the villages ringing the island's interior. It is the only area code covering a Pacific island territory that sits west of the International Date Line, and it rings in everywhere from Andersen Air Force Base in the north to the University of Guam in Mangilao.

Unlike most codes in this series, 671 has no parent code and no split history. Guam was assigned 671 directly when the territory joined the North American Numbering Plan in 1997.

Most people looking up 671 fall into two groups: those assigned a 671 number who want to understand the island it represents, and those who received a call from a 671 number and want to know whether it is a genuine Guam line or a spoofed one.

This guide explains what 671 is, the villages it covers across the whole island, how Guam joined the NANP in 1997, the military-and-tourism economy behind the number, the Chamorro Standard Time zone it keeps, the scam patterns worth knowing, and how to activate a 671 virtual number for a business.

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The 671 area code is the sole telephone code for Guam, an unincorporated US territory in the western Pacific Ocean. It was assigned in 1997, when Guam formally joined the North American Numbering Plan — before that, calls to and from the island routed through international gateways rather than the standard NANP ten-digit system.

Because Guam is a single island with one code, 671 has never been split and has never needed an overlay. Every phone number on the island, from a government office in Hagåtña to a hotel line in Tumon, carries the same 671 prefix.

Dialing Format and Time Zone

Calls placed from the US mainland to Guam use the standard NANP long-distance format, and calls within Guam follow the same ten-digit structure used across the numbering plan. Anyone unfamiliar with the convention can review the standard US phone number format before dialing.

• Dialing format: (671) 555-0175
• International: +1 671-555-0175
• Time zone: Chamorro Standard Time (ChST) — UTC+10 year-round, with no Daylight Saving Time observed
• Overlay: none — 671 is a single, never-split, never-overlaid code covering the whole island

The 671 footprint covers all 19 villages of Guam, from the historic capital on the west coast to the military and agricultural land in the north and the quieter southern coastline. Guam calls its municipalities "villages" rather than cities, and every one of them shares the same 671 code.

Hagåtña, Tamuning & the Central Corridor

• Hagåtña — Guam's capital village, seat of the territorial government
• Tamuning — home to Tumon Bay's hotel strip and the Guam International Airport corridor
• Dededo — the island's largest and most populous village, a commercial hub in the north-central district
• Mongmong-Toto-Maite — a residential village bordering Hagåtña

The North and South

• Yigo — home to Andersen Air Force Base in the island's far north
• Mangilao — home to the University of Guam and Guam Community College
• Barrigada, Yona, Chalan Pago-Ordot & Sinajana — central villages ringing Hagåtña
• Santa Rita, Agat, Piti & Asan-Maina — western villages near Naval Base Guam
• Talofofo, Inarajan, Merizo (Malesso'), Umatac & Agana Heights — the quieter southern and eastern villages

Guam has no bordering area code on the island itself. The nearest NANP territory is the Northern Mariana Islands on 670, roughly 130 miles north across open ocean, and American Samoa on 684, thousands of miles to the southeast in the Pacific. Anyone comparing 671 with other US and territorial codes can browse the full area codes directory for coverage details nationwide.

For most of the 20th century, calls to Guam did not run through the standard North American numbering system at all. The island connected to the rest of the world through international dialing routes, similar to calling any country outside the NANP footprint.

A Direct Assignment, Not a Split

That changed in 1997, when Guam was formally integrated into the North American Numbering Plan and assigned the area code 671. Unlike nearly every mainland code, which traces back to a parent code split apart as population grew, 671 has no split lineage — it was created as a standalone assignment for the whole island from day one.

Because Guam's population and call volume never approached the threshold that forces a split or overlay, 671 has needed neither in the years since. It remains one of the smaller NANP codes by population, but its ten-digit dialing format is identical to any code on the mainland.

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What gives 671 its identity is an economy built on two pillars: the US military presence and Pacific tourism. A 671 number carries an association with both, from a base contractor in Yigo to a hotel front desk in Tamuning.

Andersen AFB, Naval Base Guam & Joint Region Marianas

Andersen Air Force Base in the north and Naval Base Guam in the west anchor Joint Region Marianas, the US military's largest presence in the western Pacific and the island's biggest single employer. Defense spending and the contractor economy that supports it touch nearly every village on the island.

Tumon Bay and Chamorro Culture

Tamuning's Tumon Bay is Guam's tourism engine, drawing visitors from Japan, South Korea and across the Asia-Pacific region to its resort strip. Beyond the hotels, Guam's Chamorro culture and history — from Spanish colonial-era landmarks in Hagåtña to the villages of the south — underpin an economy that runs on hospitality as much as defense.

For any of these markets — a base support contractor in Yigo, a tour operator in Tamuning, or a University of Guam vendor in Mangilao — a local 671 number signals genuine island presence in a way a mainland US code cannot.

The entire island observes Chamorro Standard Time (ChST) — a fixed UTC+10 offset that never changes, because Guam does not observe Daylight Saving Time. It is the only time zone used anywhere in the 671 area code.

Guam sits on the far side of the International Date Line from the US mainland, which means it is typically a full calendar day ahead of the East and West Coasts, in addition to the usual clock-hour difference. For a business coordinating with a 671 line, that combination of no-DST and date-line offset is worth planning around — a call scheduled for "Monday afternoon" in Guam can land on Sunday evening in California.

671 is a legitimate, long-established Guam code, but like any area code its numbers can be spoofed. Caller-ID spoofing lets a fraudster make any number — including a 671 prefix — appear on a screen, so a resident sees what looks like a nearby village business or a government office calling. Because a 671 number reads as familiar and local across the whole island, a spoofed one can be more effective at getting an unsuspecting resident to answer.

• Unsolicited calls demanding immediate payment by gift card, wire transfer or cryptocurrency
• Callers posing as a utility, bank or territorial government agency asking to "verify" personal or account details
• Fake prize, debt-relief or tax-settlement offers that require an upfront fee
• Robocalls about an urgent account problem that pressure a callback to a number other than the one on file

Guam residents can check the territory's Public Utilities Commission for current consumer notices, and the safest habit is always to verify independently before acting on any unexpected call — hang up and dial the number printed on a statement or an official website rather than one a caller provides.

Modern cloud phone providers let a business activate a 671 number in minutes — no office in Hagåtña, no hardware, and no long-term contract. Search available 671 numbers, complete a short verification, and route the line to any device anywhere in the world. Because 671 is the established code for the entire island, the number reads as authentically local from Dededo to Tumon Bay, even for a team working remotely from elsewhere.

A 671 number suits any business targeting Guam — base-support contractors near Andersen AFB or Naval Base Guam, hospitality and tour operators around Tumon Bay, vendors serving the University of Guam in Mangilao, and any company coordinating with the territorial government in Hagåtña.

A company that already runs a virtual phone number for business elsewhere can add a 671 line as a second local number in the same account. MeraTalk provides 671 numbers as part of its cloud telephony platform — lines activate in minutes, route to any device, and pair with voicemail, call recording, an auto-attendant and CRM integration from one dashboard. To get started, search available numbers at meratalk.com. For more, see Public Utilities Commission.

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