Global Sourcebook for International Data Management

                                         by Graham Rhind

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Global Sourcebook | Index | Properties


Guam is a territory of the United States of America.

For supplementary information, see links to post office home pages here External, to postal code pages here External and to other personal name and addressing issues pages here External.


Table of Contents

Guam - Country information


Local short name form

Official name





International telephone access code


ISO 3166 country codes

Car nationality plate code

Internet country code


GRC Country Code


Guam - Languages


English External, spoken by 28 800 people and Chamorro External, spoken by 62 500 people are the official languages.

Guam - Addresses etc.


Guam is an unincorporated territory of the United States of America in the Pacific. It forms part of the United States’ postal system. Its state code is GU and its postal codes (known locally as ZIP Codes) fall in the range 96910-31.

Please refer to the chapter on the United States of America for further information.

A table containing information about the relevant position of elements within address blocks can be acquired External

Guam - Postal code format graphic

image image

Guam - Postal code format

Guam - Postal code specifics

Guam - Postal code regular expression


Guam - Postal code level of coverage


Guam - Post office box


This is written PO Box.

Place names in Guam


Refer to Exonyms in Guam for full lists of place names in Guam in other languages.

Alternate place name forms/postal code tables can be acquired at External

Other language place name data can be acquired at External

Guam - Administrative districts



Guam is split into 19 municipalities External.

   Agana Heights External 
   Agat External    
   Asan External    
   Barrigada External        
   Chalan-Pago-Ordot External      
   Dededo External 
   Hagåtña External           
   Inarajan External           
   Mangilao External        
   Merizo External            
   Mongmong-Toto-Maite External         
   Piti External      
   Santa Rita External       
   Sinajana External          
   Talofofo External          
   Tamuning External       
   Umatac External           
   Yigo External    
   Yona External

Telephone numbers in Guam


All telephone numbers in Guam take the area code 671. Subscriber numbers are 7 digits long.

Tables of telephone number information/formats can be acquired – see External

Every effort is made to keep this resource updated. If you find any errors, or have any questions or requests, please don't hesitate to contact the author.

All information copyright Graham Rhind 2017. Any information used should be acknowledged and referenced.