Municipalities of Guam

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Updates: 

I have acquired some more historical information about the municipalities of Guam.

I added the population data from the 2000 census. The census table refers to the divisions as "districts".

Country overview: 

Guam became an unincorporated territory of the United States as a result of the Spanish-American War in 1898. It still retains that status. It was occupied by Japan during World War II.

Other names of country: 

1. English: Territory of Guam (formal)
2. French: Guam m
3. Icelandic: Gvam
4. Italian: Guam
5. Portuguese: Guam m
6. Spanish: Guam
7. Turkish: Guam

Origin of name: 

Possibly a corruption of Chamorro, ethnic name

Primary subdivisions: 

Guam is divided into 19 municipalities.

FIPS PUB 5-2 assigns Guam an alphabetic code of GU and a numeric code of 66. FIPS PUB 6-4, which ordinarily has three-digit codes for each of the second-level subdivisions of the United States, only lists one code in Guam: 010. When the FIPS 5-2 and 6-4 codes are concatenated, the result (66010) is a code that represents Guam as a county-equivalent unit.

Time zone: On 2000-12-23, the time zone for Guam and the Northern Mariana Islands was officially named "Chamorro Standard Time". The abbreviation is "ChST". It corresponds to UTC+10 hours. Daylight saving time is not observed here.

Postal codes: 

Guam uses the United States system of ZIP codes. Its codes are in the range 96910 - 96932.

Territorial extent: 

Guam occupies a moderately large island, the southernmost in the Marianas group; and some adjacent islets. All of the municipalities lie mainly on Guam Island. In addition, Agat municipality includes Alutom, Anae, Bangi, and Facpi Islands; Merizo includes Agrigan and Cocos Islands; Piti includes Cabras Island; Santa Rita includes Neye and Udall Islands; and Tamuning includes Alupat Island.

Change history: 

The municipalities of Guam were first established in the 1920s. The original set of municipalities was as shown in this table, and on this map .

This map  shows the municipalities and their populations in 1941. The areas in the table below were calculated by dividing the population by the density.

1. The municipalities of Guam in 1971 were the same as above, except that Sumay was replaced by Apra and Agaña was replaced by Tamuning. Agana was located in Tamuning municipality. Apra covered the same territory as Sumay in the table above. Agana municipality in 1930 was equivalent to Barrigada, Dededo, Machanao, Sinajana, Tamuning, and Yigo in 1971.
2. 1998-04-08: Name of capital and its municipality changed from Agana to Hagåtña.