Guam Population, Main Cities and Geography

By | January 27, 2023

Guam Population and cities

According to Countryaah website, approx. 160,000 people live on Guam.

Ethnic composition

37% are Chamorroers

28% Filipinos

25% Asians

10% Caucasians

Religious affiliation

85% of the population are Catholics and 15% belong to other religions.

National languages English, Chomorroic and Japanese are spoken on the island.

The Spanish language is present in place names and in many expressions in Chomorro to this day.


The capital of Guam is Hagatna, the former Agana, with a population of around 1,800.

Guam: map

Guam covers a total land area of around 549 km². Check topmbadirectory for politics, flags, famous people, animals and plants of Guam.

The state consists of a main island of approx. 540 km² and the small offshore coconut island in the south.

Guam has a coastline of around 125 km.


Tidal range in Guam

In Guam the mean tidal range is 1-2 m.


The world’s highest tidal range can be found in the Bay of Fundy in Canada, where it is up to 16 meters, and at spring tide even over 20 meters. The Bay of Fundy is located on the Atlantic between the Canadian provinces of New Brunswick and Nova Scotia, which is called Nova Scotia in German and whose capital is Halifax.

On the German North Sea coast it varies between one and three meters. In the western Baltic Sea, on the other hand, the tidal range is only 0.3 meters, while it is barely noticeable in the eastern Baltic Sea.

Longitude and latitude

Guam extends over the following geographical latitude (abbreviation Δφ) and geographical longitude (abbreviation Δλ):

Δφ = from 13 ° 15 ‘to 13 ° 40’ north Δλ = from 144 ° 40 ‘to 144 ° 58’ east

You can find detailed information on this subject under: Geographical longitude and latitude.

Legal time

For Guam, the following value applies to Central European Time (CET), i.e. the time without summer time. A minus sign means that it is earlier there, a plus sign that it is later than CET:

Δt (CET) = + 9 h

More detailed explanations of the time can be found under: Time zones, time.

Highest sun in Guam

Guam is located at a northern latitude of around φ = 13 ° 30 ‘and thus in the middle of the tropics.

If the sun or its pixel is exactly over this area of the island, i.e. at 13 ° 30 ‘N, the sun is exactly perpendicular there. This happens exactly twice a year, roughly 52 after March 21st and 52 days before September 21st.

Mountains or elevations

Mount Lamlam

The highest mountain or the highest elevation in the country is Mount Lamlam with a height of 406 m.

Other high elevations are:

  • Mount Manglo with a height of 391m
  • Mount Alifan with a height of 265 m

Rivers, lakes


The longest river in the country is the Talofolo.

Other rivers in the country are:

  • Agana
  • Ylig

Fena Lake

The largest lake is Fena Lake. The lake is located in the south of the island and drains into the Pacific via the Talofolo

Pacific Ocean

With a total coastline of 125 km, Guam borders the Pacific Ocean – more precisely, Guam is located in the South Pacific, the so-called South Pacific. This region of the Pacific Ocean includes the Polynesian Islands as well as parts of Melanesia and Micronesia.

Guam Population