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Guam — United States

Welcome to the postal codes directory for Guam, United States. As a prominent region in United States, Guam contains 18 major cities indexed. Our platform provides comprehensive zip codes, neighborhood directories, and simulated local phone number generation rules for developer form testing and compliance verification.

18 Total Cities Indexed
GUAM Region Code
🔍 Showing 18 cities

Cities

18
Agana Heights Agat Asan Barrigada Dededo Hagatna Inarajan Mangilao Merizo Mongmong Piti Santa Rita Sinajana Talofofo Tamuning Umatac Yigo Yona

Frequently Asked Questions

Regional Divisions & Cities
Guam encompasses diverse geographical zones and municipal areas. This platform indexes 18 major cities in Guam, linking each city to its postal codes, neighborhoods, and regional phone area codes.
State-Level Telecom Infrastructure
Under the NANP system, Guam is allocated several distinct area codes covering specific counties and metropolitan districts. Select a city to explore local dialing overlays and to generate valid mock phone patterns.
How to look up the exact postal code for a specific district or street under Guam?
You can select the corresponding city from the list above. On the city page, we provide a complete mapping table of districts, streets/neighborhoods, and their exact postal codes. You can also use the search bar at the top to instantly locate a street or neighborhood.
What is the purpose of the zip code database and simulated phone generator for Guam?
The database compiles all major cities and postal districts within Guam. The tools allow developers and QA testers to generate format-compliant phone numbers to verify web forms, check localization rules, and test regional validation logic.
Are the phone numbers generated for Guam active and real?
No, all numbers generated are simulated. They use the correct country prefix and the local area codes assigned to Guam, but the subscriber numbers are randomly generated for software validation purposes. They cannot make or receive calls, nor can they receive SMS verification codes.
How frequently is the postal code data for Guam updated?
Our database is regularly synced with official postal updates and open-source registry databases. While we strive to maintain high accuracy for development and testing purposes, you should always check the official national postal service for critical mailing validation.