San Juan is the capital and most populous municipality of Puerto Rico, a United States territory, on the island's northeastern coast, with a population of 342,259 at the 2020 census and a metropolitan area of about 2.35 million. Founded by Spanish colonists in 1521, it is the second-oldest European-founded capital city in the Americas after Santo Domingo, and its historic fortifications and La Fortaleza, the oldest executive mansion in continuous use in the Americas, are UNESCO World Heritage sites. San Juan is a major Caribbean financial and tourism hub, home to pharmaceutical, petroleum-refining, rum and brewing industries and known as a center of salsa music.
Facts
PopulationThe infobox 2020 Census figure (342,259) is superseded in the same infobox by a 2025 population estimate; the more recent estimate is stored, matching this atlas's practice elsewhere of preferring the most recent dated figure. Area (sq km)Converted from the infobox area_total_sq_mi value of 77.0 sq mi (1 sq mi = 2.58999 km2); the infobox carries no native km2 figure. Founding Year Population Estimate Year Elevation (m) Sources
1. San Juan, Puerto Rico (Wikipedia)
Wikimedia FoundationLead section
San Juan is the capital city and most populous municipality in Puerto Rico, an unincorporated territory, and insular area of the United States.
Infobox, area_total_sq_mi
77.0
Infobox, elevation_m
8
Infobox, established_date2 (Founded)
August 15, 1521
Infobox, coordinates
18|24|23|N|66|3|50|W
Infobox, population_est (pop_est_as_of 2025)
329,737
Infobox, pop_est_as_of
2025
- In Group: Cities of Northern America (World), Wikipedia; part-of country and UN M49 subregion
View the Source Wikidata: San Juan, Puerto Rico
Wikidata Q41211, class allow-list match verified against P17/real-world identity (w-geo-qidcite-0926).View the Source Wikidata: United States
On Continent: North America, Wikidata item for United States, property P30 (continent)View the Source Reader Challenges (0)
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