Guam is a U.S. territory, not a country and not a state. More precisely, it is an unincorporated territory of the United States, located in the Western Pacific about 3,800 miles west of Hawaii. Its roughly 168,000 residents are American citizens from birth, the U.S. dollar is the currency, and both English and Chamorro are official languages. So anyone asking whether Guam is a country or a U.S. territory has the short answer: it belongs to the United States, but it is not part of any state and sits in a category of its own.
What “Unincorporated Territory” Means
The word “unincorporated” is doing a lot of work. It means Guam is a possession under U.S. sovereignty rather than an integrated part of the nation. Under the Territorial Clause of the Constitution (Article IV, Section 3), Congress holds broad power to “dispose of and make all needful rules and regulations” regarding U.S. territory. In practice, Congress can override Guam’s local legislature on virtually any matter.1The Commission on Decolonization. Governance The island cannot enter into foreign treaties, control its own borders, or operate outside the framework Congress sets.
The U.S. Constitution also does not automatically extend to Guam in full. A series of early-1900s Supreme Court decisions known as the Insular Cases established that only “fundamental” constitutional rights apply in unincorporated territories, while Congress chooses whether to extend the rest.2U.S. Department of the Interior. Definitions of Insular Area Political Organizations The Organic Act of Guam does extend many protections, including the right to a speedy trial, protection against unreasonable searches, and due process, but these are grants from Congress rather than inherent rights of the territory.4U.S. Government Publishing Office. Organic Act of Guam
How Guam Became American
Spain controlled Guam for more than three centuries. That ended with the Treaty of Paris signed on December 10, 1898, which closed the Spanish-American War and ceded Guam to the United States along with Puerto Rico and the Philippines.3Yale Law School. Treaty of Peace Between the United States and Spain The U.S. Navy ran the island for the next five decades.
Civilian government arrived with the Guam Organic Act of 1950, codified at 48 U.S.C. § 1421. The Act transferred administrative authority from the Navy to the Department of the Interior and created three branches of local government: an elected governor, a unicameral legislature, and a local court system.5U.S. Government Publishing Office. Organic Act of Guam Guam has governed its internal affairs through that framework ever since.
Citizenship, Voting, and Representation
Anyone born in Guam is a U.S. citizen at birth. Federal law has guaranteed this since the Organic Act, and 8 U.S.C. § 1407 makes it explicit for everyone born on the island on or after April 11, 1899.6Office of the Law Revision Counsel. 8 USC 1407 – Persons Living in and Born in Guam That citizenship comes with a U.S. passport and the right to move freely to any state. Male residents between 18 and 25 must register with the Selective Service System, the same as men on the mainland.
Voting is where the picture turns unequal. Guam’s residents cannot vote in presidential general elections, even though every federal policy and executive order applies to them.7U.S. Commission on Civil Rights. Voting Rights in U.S. Territories Advisory Memorandum The island’s only voice in Congress is a non-voting delegate in the House of Representatives, authorized by 48 U.S.C. § 1711.8Office of the Law Revision Counsel. 48 USC 1711 – Delegate to House of Representatives from Guam and Virgin Islands That delegate can sit on committees and speak on the floor but cannot cast a vote on final passage of any bill. Guam has no representation in the Senate at all.
One political outlet does exist: presidential primaries. Both major parties hold nominating events on Guam and send delegates to their national conventions. In 2024, Guam’s Democratic caucus allocated seven delegates and its Republican convention allocated nine. The island has also held a non-binding straw poll on presidential Election Day since 1980.
Taxes and Federal Benefits
Guam runs a “mirror” tax system. Under 48 U.S.C. § 1421i, the federal Internal Revenue Code applies on the island with “Guam” substituted for “United States” and the Governor’s office substituted for the IRS.9Office of the Law Revision Counsel. 48 USC 1421i – Income Tax Laws of Guam Residents file with the Guam Department of Revenue and Taxation, not the IRS, and those revenues stay on the island. Bona fide residents whose income comes from Guam sources generally do not owe federal income tax to the U.S. Treasury.10Office of the Law Revision Counsel. 26 USC 931 – Income From Sources Within Guam, American Samoa, or the Northern Mariana Islands
Federal programs reach Guam unevenly. Residents pay into Social Security and Medicare through payroll taxes and receive benefits from both.11Centers for Medicare and Medicaid Services. Guam Medicare Assistance Program Medicaid is treated differently. Unlike in the 50 states, where the federal government matches all qualifying expenditures, Guam’s Medicaid funding is capped by a statutory spending ceiling. The federal matching rate is permanently set at 83 percent, but once the ceiling is exhausted, Guam must cover the rest on its own.12Medicaid.gov. Guam Supplemental Security Income, the federal cash assistance program for elderly, blind, and disabled individuals with limited resources, does not extend to Guam at all. Legislation to change that exclusion has been introduced repeatedly but has not passed as of 2026.
Traveling To and From Guam
Because Guam is U.S. soil, American citizens do not need a passport to travel between the mainland and the island.13USAGov. Do You Need a Passport to Travel to or From U.S. Territories or Freely Associated States? A valid government-issued photo ID is enough, the same way you would fly between states. Arriving passengers, including citizens, must complete an electronic customs declaration through Guam Customs and Quarantine, ideally within 72 hours before arrival.
Foreign nationals have a separate pathway. The Guam-CNMI Visa Waiver Program lets citizens of eligible countries, including Australia, Japan, South Korea, the United Kingdom, and Taiwan, enter Guam without a visa for up to 45 days for business or tourism.14U.S. Customs and Border Protection. Official G-CNMI ETA Application Website Travelers using this program are restricted to Guam and the Northern Mariana Islands. Anyone planning to continue to Hawaii or the mainland needs a standard visa or ESTA-eligible passport.
How the United Nations Classifies Guam
Outside the American legal system, the international community views Guam’s status differently. The United Nations has listed Guam as a Non-Self-Governing Territory since 1946, meaning the UN considers it a place that has not yet achieved full self-determination.15United Nations. Guam It is one of 17 territories that remain on the UN Special Committee on Decolonization’s agenda.16United Nations. Non-Self-Governing Territories
The General Assembly reviews Guam’s situation each year and encourages the population to eventually choose a permanent political status, whether statehood, free association, or independence. The United States considers this a domestic matter. Guam’s own Commission on Decolonization has worked to educate residents about these options, but no binding status vote has taken place. For now, Guam is what it has been since 1898: American soil governed under rules that give its people most of the responsibilities of citizenship without all of the corresponding political power.