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Updates: 

I added the population data from the 1950 and 2010 censuses.

Country overview: 

Short name	GUAM
ISO code	GU
FIPS code	GQ
Languages	English (en), Chamorro
Time zone	+10
Capital	Hagåtña

 

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. Russian: Гуам
7. Spanish: Guam
8. Turkish: Guam

Origin of name: 

Possibly a corruption of Chamorro, ethnic name

Primary subdivisions: 

Guam is divided into 19 municipalities.

Municipality	HASC	Pop-2010	Pop-2000	Pop-1990	Area(km.²)	Area(mi.²)
Agana Heights	GU.AH	3,808	3,940	3,646	3	1
Agat	GU.AT	4,917	5,656	4,960	26	10
Asan	GU.AS	2,137	2,090	2,070	16	6
Barrigada	GU.BA	8,875	8,652	8,846	23	9
Chalan-Pago-Ordot	GU.CP	6,822	5,923	4,451	16	6
Dededo	GU.DD	44,943	42,980	31,728	78	30
Hagåtña	GU.AN	1,051	1,100	1,139	3	1
Inarajan	GU.IN	2,273	3,052	2,469	49	19
Mangilao	GU.MA	15,191	13,313	10,483	26	10
Merizo	GU.ME	1,850	2,163	1,742	16	6
Mongmong-Toto-Maite	GU.MT	6,825	5,845	5,845	5	2
Piti	GU.PI	1,454	1,666	1,827	18	7
Santa Rita	GU.SR	6,084	7,500	11,857	44	17
Sinajana	GU.SJ	2,592	2,853	2,658	3	1
Talofofo	GU.TF	3,050	3,215	2,310	44	17
Tamuning	GU.TM	19,685	18,012	16,673	16	6
Umatac	GU.UM	782	887	897	16	6
Yigo	GU.YG	20,539	19,474	14,213	91	35
Yona	GU.YN	6,480	6,484	5,338	52	20
19 municipalities		159,358	154,805	133,152	545	209
HASC: Hierarchical administrative subdivision codes. Pop-2010: 2010-04-01 census Pop-2000: 2000-04-01 census Pop-1990: 1990-04-01 census

 

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.

The UN LOCODE page  for Guam lists locations in the country, some of them with their latitudes and longitudes, some with their ISO 3166-2 codes for their subdivisions. This information can be put together to approximate the territorial extent of subdivisions.

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 the map at source [1].

Municipality	Population	Modern
Agana	11,042	Agana Heights, Barrigada, Chalan-Pago-Ordot, Dededo, Hagåtña, Mangilao, Mongmong-Toto-Maite, Sinajana, Tamuning, Yigo
Agat	887	Agat, Santa Rita (part)
Asan	559	Asan
Inarajan	1,176	Inarajan, Talofofo
Merizo	1,101	Merizo, Umatac
Piti	928	Piti
Sumay	1,209	Santa Rita (part)
Yona	489	Yona
8 munic.	18,509
Population: 1930 census. Modern: Municipalities as of 2000 occupying approximately the same territory.

 

Source [2] shows the municipalities and their populations in 1941. The areas in the table below were calculated by dividing the population by the density. Population data from source [3] are much different, but perhaps World War II accounts for the changes.

Municipality	Pop-1941	Pop-1950	Area(km.²)	Capital
Agaña	10,861	800	1	Tamuning
Agat	1,126	4,682	64	Agat
Asan	639	3,090	16	Asan
Barrigada	724	11,534	53	Barrigada
Dededo	1,529	6,441	68	Dededo
Inarajan	1,087	1,490	49	Inarajan
Machanao	377	684	58	Fafalog
Merizo	669	1,086	18	Merizo
Piti	1,190	1,902	20	Piti
Sinajaña	1,180	9,169	30	Sinajaña
Sumay	1,679	6,718	13	Apra
Talofofo	512	913	43	Talofofo
Umatac	444	580	22	Umatac
Yigo	330	9,022	74	Yigo
Yoña	720	1,387	54	Yoña
15 munic.	23,067	59,498	583
Pop-1941: 1941 estimate (source [2]). Pop-1950: 1950 census (source [3]). Capital: administrative seat, 1971.

1. 1950-08-01: Guam Organic Act made Guam an unincorporated territory of the U.S.
2. 1971: The municipalities of Guam 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.
3. 1998-04-08: Name of capital and its municipality changed from Agana to Hagåtña.

Sources: 

1. [1] Our Changing Island : A History of the Census in Guam. Lesson plan, offered by the Bureau of the Census website (retrieved 2001-05-25).
2. [2] The NationMaster Statistical Data site has a map  which cites Thompson, Laura, Guam and its People: A Study of Culture Change and Colonial Education. San Francisco, 1941. (Retrieved 2008-01-29.)
3. [3] Demographic Yearbook , 7th Ed. Statistical Office of the United Nations, New York, 1955 (retrieved 2011-08-20).
4. [4] Census Bureau press release : "U.S. Census Bureau Releases 2010 Census Population Counts for Guam" (dated 2011-08-24, retrieved 2011-12-11).