Guam Area Code (671) & How to Call Guam Phone Numbers from the US

July 30, 2024

Planning to call Guam or need to know its area code? You’ve come to the right place! This guide provides everything you need to know about reaching phone numbers in Guam, especially when calling from the United States. Let’s start with the most important piece of information:

The area code for all of Guam is 671.

Guam is a U.S. territory and part of the North American Numbering Plan (NANP). This is crucial because it means calling Guam from the US is treated similarly to calling another US state, not typically as an international call (though always check your specific carrier’s plan details).

[Optional Image Suggestion: Map highlighting Guam’s location relative to the US, with “Area Code 671” text]

How to Call Guam From the US (Step-by-Step)

Calling Guam from the United States (including mainland US, Alaska, Hawaii, Puerto Rico, US Virgin Islands) or Canada is straightforward because it’s part of the NANP. Follow this format:

Dial **1** (the NANP country code for the US and its territories).
Dial **671** (the specific area code for Guam).
Dial the **seven-digit local Guam phone number**.

So, the complete dialing format is: 1 + 671 + XXX-XXXX

Guam Phone Number Example:

Let’s say the local Guam number you want to call is 555-1234. When calling from the US, you would dial:

1-671-555-1234

Guam Phone Number Format & Local Dialing

All standard phone numbers within Guam follow this format:
* (671) XXX-XXXX

Important Note on Local Dialing (Within Guam): Since October 2021, mandatory **10-digit dialing** is required for all local calls *within* Guam. This means even if you are physically in Guam calling another number in Guam, you must dial the area code: 671 + XXX-XXXX. You no longer just dial the seven-digit number for local calls.

Is Calling Guam Considered International from the US?

This is a common question. Because Guam is a US territory and part of the North American Numbering Plan (NANP, which uses country code 1), calls placed from the US to Guam are generally considered **domestic long-distance calls**, similar to calling from California to New York. They are **NOT typically treated as international calls** by major US carriers like AT&T, Verizon, or T-Mobile on most standard plans.

However, **ALWAYS double-check with your specific phone carrier and plan.** Some budget carriers or specific older plans might have different rules or charge per-minute rates. Verify coverage and potential costs before making frequent or long calls.

Finding Guam Phone Numbers (Guam Phone Book)

If you need to look up a specific business or individual’s number in Guam:

Guam Phone Book:** The most comprehensive local directory is available online at guamphonebook.com. This is the best resource for a “Guam phone directory” or “Guam phone number search“.
Online Search:** Standard search engines can also find numbers for many businesses if you include “Guam” in your search query.
Business Websites/Social Media:** Check the official website or social media profiles of the business you’re trying to reach.