San Juan, Puerto Rico
For the city in Metro Manila, see San Juan, Metro Manila. Municipality in Puerto Rico, United States San Juan, Puerto Rico Municipality Municipality of San Juan Municipio de San Juan San Juan at night Flag Coat of arms Nickname(s): "La Ciudad Amurallada" Spanish for "The Walled City" "Ciudad Capital" Spanish for "Capital City" Location in the commonwealth of Puerto Rico Coordinates: 18°24′23″N 66°3′50″W / 18.40639°N 66.06389°W / 18.40639; -66.06389 Coordinates: 18°24′23″N 66°3′50″W / 18.40639°N 66.06389°W / 18.40639; -66.06389 [1] Country United States Territory Puerto Rico Established 1509 [2] Named for John the Baptist Government • Mayor Carmen Yulín Cruz (PDP) Area [1] • Municipality 77.0 sq mi (199 km 2 ) • Land 47.9 sq mi (124 km 2 ) • Water 29.1 sq mi (75 km 2 ) 37.8% • Urban 876.2 sq mi (2,269 km 2 ) Elevation [3] 26 ft (8 m) Population (2010) [4] • Municipality 395,326 • Density 8,253/sq mi (3,187/km 2 ) • Urba