large color map guam north pacific ocean

Guam is an unincorporated and organized territory of the United States, and is located in the western Pacific Ocean

The island was inhabited by Chamorros some 4,000 years ago, and was discovered by Ferdinand Magellan in 1521. Spainestablished the first colony in 1668, and the island became an important stopover for the Spanish Manila Galleons. 

In 1898 the island was surrendered to the United Statesduring the Spanish-American War, only to be captured byJapan in 1941 amidst World War II--mere hours after the attack on Pearl Harbor. 

The Japanese occupied Guam for two-and-a-half years, before U.S. troops were able to recapture the island in 1944. 

These days, Guam is supported by its tourism industry, that consists primarily of visitors from Japan, as well as its second largest source of income, which comes from the United States Armed Forces.

Fast Facts

  • Name: Guam
  • Capital City: Hagåtña (1,051 pop.)
  • Population: 159,358 (2010 est.)
  • World Populations (all countries)
  • Currency: United States dollar (USD) 
    (conversion rates)Comptoirs Francais du Pacifique franc  
    One dollar
  • Ethnicity: Chamorro 37.3%, Filipino 26.3%, white 7.1%, Chuukese 7%, Korean 2.2%, other Pacific Islander 2%, other Asian 2%, Chinese 1.6%, Palauan 1.6%, Japanese 1.5%, Pohnpeian 1.4%, mixed 9.4%
  • Language: English 43.6%, Filipino 21.2%, Chamorro 17.8%, other Pacific island languages 10%, Asian languages 6.3%, other 1.1%
  • Largest Cities: (by population) Dededo Village, Yigo Village, Tamuning-Tumon-Harmon Village, Mangilao Village, Barrigada Village
  • National Day: First Monday in March
  • Religion: Roman Catholic 85%, other 15%


Micronesia flag

The flag of Guam was designed on the island, and officially adopted in 1917. As a territory of the United States it features traditional U.S. colors, along with a symbolic seal that includes a swaying palm tree, sand, and the waters of the Pacific Ocean. 

Larger Guam flag

Geo. Statistics

  • Coastline: 77 miles (125 km)
  • Land Area
    (land) 209 sq mi (541 sq km)
    (water) 0 sq mi (0 sq km)
    (TOTAL) 209 sq mi (541 sq km)To convert sq km (kilometers) to sq mi (miles)
    use our converter
  • Land Area: (all countries)
  • Latitude & Longitude: 
    Hagåtña (capital city): 13° 28' N, 144° 45' E
  • Horizontal Width: unknown
  • Vertical Length: unknownNote: Lengths and widths are point-to-point, straight-line measurements from a Mercator map projection, and will vary some using other map projections
  • Geographic Center: unknown
  • Highest Point: Mount Lamlam 1,338 ft. (408 m)
  • Lowest Point: Pacific Ocean (0m)


Guam is the southernmost and largest island in the Mariana island chain, and is located in the western Pacific

The island is volcanic in origin, and ringed by steep coastal cliffs and sandy beaches. Mountains are primarily located on the southern end of Guam, with the northern region of the island sloping into low hills. Deepwater channels and a coral table reef are located along much of the coast. 

The highest point is Mount Lamlam at 1,338 ft. (408 m).



ATTRACTIONS: (a few major)

Guam is a popular tourist destination, especially for 


travelers. The city of Tumon is a tourist hub, and boasts over 20 large hotels, various shopping centers, an indoor aquarium, Las Vegas style shows, and has seven public golf courses. 

For the more laid back, the southern part of the island holds historical villages, stunning waterfalls, and immaculate beaches. 


Guam experiences a tropical climate, and is generally warm and humid. Northeast trade winds moderate the temperature, which ranges in the 80's (26°C) annually. 

January through June is typically the dry season, with the rainy season lasting from July to December. Annual precipitation is 92 inches (2,336 mm).

Latest by WorldAtlas