San Juan is the capital of Puerto Rico. Founded by Spanish colonists in 1521, it is the oldest city under U.S. jurisdiction and the island’s most populous municipality, with roughly 292,000 residents. The territory’s legislature meets in San Juan, the governor lives and works there, and most of Puerto Rico’s economic activity is concentrated in and around the city.1Britannica. San Juan
Where the Government Sits
Puerto Rico’s bicameral Legislative Assembly, a Senate and a House of Representatives, meets in El Capitolio, a Neoclassical building in the Puerta de Tierra section of San Juan.2Wikipedia. Capitol of Puerto Rico This is where territorial fiscal policy is debated and voted on, including measures shaped by the federal Puerto Rico Oversight, Management, and Economic Stability Act (PROMESA).3Office of the Law Revision Counsel. 48 USC Chapter 20 – Puerto Rico Oversight, Management, and Economic Stability
A short distance away, La Fortaleza is both the official residence and the working office of Puerto Rico’s governor. Originally built between 1533 and 1540 as a harbor fortress against pirates, it is the oldest executive mansion in continuous use in the Americas, and more than 170 governors have lived there.4La Fortaleza. La Fortaleza Executive orders and the day-to-day administration of the territory come out of this building.
San Juan took on its current role in 1898, when Spain ceded Puerto Rico to the United States under the Treaty of Paris that ended the Spanish-American War.5Office of the Historian. Papers Relating to the Foreign Relations of the United States It shifted from a Spanish colonial capital to the seat of American territorial governance and has held that role ever since.
What Being the Capital of a U.S. Territory Does Not Include
Puerto Rico’s relationship to the federal government is unlike that of any state. Under the Territorial Clause of the U.S. Constitution (Article IV, Section 3), Congress holds broad authority over the island’s governance and can legislate directly on its local affairs.6Congress.gov. Power of Congress over Territories People born in Puerto Rico have been U.S. citizens since the Jones-Shafroth Act of 1917.7Library of Congress. 1917 Jones-Shafroth Act – A Latinx Resource Guide
That citizenship carries a significant limit. Residents of Puerto Rico cannot vote in U.S. presidential general elections. The Constitution assigns electoral votes only to states and the District of Columbia, and Puerto Rico is neither. The island does hold presidential primaries that select delegates for the national party conventions, but that participation ends before the general election. A Puerto Rico resident who wants to vote for president has to establish residency in one of the 50 states or in D.C.
Instead of senators and voting House members, Puerto Rico sends a single Resident Commissioner to the U.S. House of Representatives, elected to a four-year term rather than the standard two-year cycle. The Resident Commissioner can introduce legislation, serve on committees, participate in hearings, and speak on the House floor, but cannot vote on final passage of bills, vote for the Speaker, or preside over the chamber.8Representative Pablo Hernandez. What is a Resident Commissioner? Puerto Rico has no representation in the U.S. Senate.
A Capital Under Federal Law
Federal law reaches San Juan in ways that shape everyday life. The Jones Act requires that goods moving by water between U.S. ports travel on vessels that are U.S.-built, U.S.-flagged, and U.S.-owned.9Office of the Law Revision Counsel. 46 USC 55102 – Transportation of Merchandise Because Puerto Rico is a U.S. territory, all maritime shipments from the mainland must comply. The result is a smaller pool of eligible carriers and higher costs for imported goods, a persistent issue for island residents.
Financial institutions in San Juan’s Hato Rey district, the island’s financial center, operate under federal banking regulations, with the U.S. Federal Reserve System as the primary regulator. Puerto Rico has no central bank of its own.10Association for Financial Professionals. Cash and Treasury Management Country Report Puerto Rico
Federal taxation of individuals works differently in Puerto Rico than in the states. Bona fide residents who live on the island for the entire tax year can exclude income earned from Puerto Rico sources from their federal gross income. The main exception is pay received for working as a federal government employee, which remains subject to federal income tax.11Office of the Law Revision Counsel. 26 USC 933 – Income from Sources Within Puerto Rico Someone who moves away after at least two years of residency can still exclude the Puerto Rico-source income earned during that earlier period.12eCFR. Exclusion of Certain Income from Sources Within Puerto Rico
The federal exclusion does not add up to tax-free living. Residents still pay into Social Security and Medicare through payroll taxes, Puerto Rico levies its own territorial income tax, and the island imposes a sales and use tax (known locally as the IVU) at a combined rate of 11.5%, split between a 10.5% territorial portion and a 1% municipal portion.
Visiting or Moving to San Juan
Because Puerto Rico is U.S. territory, traveling there from the mainland works like a domestic trip. U.S. citizens do not need a passport.13USAGov. Do You Need a Passport to Travel to or from U.S. Territories or Freely Associated States? Since May 2025, airport security requires a REAL ID-compliant driver’s license or another acceptable form of identification for all domestic flights, so a standard pre-REAL ID license will no longer work at the gate.14TSA. Acceptable Identification at the TSA Checkpoint
The U.S. dollar is the only currency used on the island, and most major U.S. cell phone carriers treat Puerto Rico as domestic territory, so you generally will not face international roaming charges. Check your specific plan before traveling, since some older or prepaid plans may differ.
Puerto Rico operates on Atlantic Standard Time (UTC-4) year-round and does not observe Daylight Saving Time. From March through early November, when the mainland East Coast is on Eastern Daylight Time, San Juan and New York share the same clock. From November through March, Puerto Rico runs one hour ahead of Eastern Standard Time.
Spanish and English are both official languages. Day-to-day life and local government operations run primarily in Spanish, though federal courts use English extensively and many government employees are bilingual. Visitors who speak only English can usually navigate San Juan’s tourist areas, hotels, and restaurants without difficulty, but some Spanish helps outside the main tourist corridors.