San Juan is the capital and largest municipality in Puerto Rico. As of the 2000 census, it has a population of 433,733, making it the 42nd-largest city under the jurisdiction of the United States. San Juan was founded by Spanish colonists in 1521, who called it Ciudad de Puerto Rico ("Rich Port City"). Puerto Rico's capital is the second oldest European-established city in the Americas, after Santo Domingo, in the Dominican Republic.

Several historical buildings are located in San Juan; among the most notable are the city's former defensive forts: Fort San Felipe del Morro, Fort San Cristobál and La Fortaleza, the oldest executive mansion in continuous use in the Americas.

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