VerifiedOceaniaReviewed 2026-08-08

Guam

Guam uses calling code +1 with area code 671 and is listed with ISO codes GU and GUM, the .gu ccTLD, and the US dollar.

VerifiedReviewed 2026-08-08
Calling code
+1

Shared by 20 published destinations. See all matches for +1.

ISO alpha-2
GU
ISO alpha-3
GUM
ISO numeric
316
ccTLD
.gu
Currency
USDUnited States dollar (USD)
Region
Oceania
Capital
Hagåtña
Time zones
Pacific/Guam
Postal format
US : NNNNN[-NNNN]

Sources and review

ISO 3166 - Country Codes · ITU-T - International Calling Codes · IANA - Root Zone Database · ISO 4217 - Currency Codes

How to call Guam

From outside Guam, dial your international access prefix, then +1, then the national number. Drop the leading trunk zero when the destination numbering plan requires it.

+1 [area or mobile code] [local number]

Read the international dialing guide

World references

+1Calling code pageUSDCurrency referenceZIPPostal code formatISOCountry codes lookup
USUnited StatesCACanadaJMJamaicaDODominican RepublicPRPuerto RicoBSBahamas

Quick answers for Guam

What is the country calling code for Guam?

Guam uses +1. Dial the international access prefix, then +1, then the local number without the national trunk prefix where required.

What is the ISO country code for Guam?

The ISO 3166-1 codes are alpha-2 GU, alpha-3 GUM, and numeric 316.

What currency does Guam use?

Guam uses United States dollar (USD).

What is the ccTLD for Guam?

Guam uses .gu as its country-code top-level domain.