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San Juan Antiguo (not to be confused with the historic district of Old San Juan), is a barrio located in the municipality of San Juan in the Commonwealth of Puerto Rico. San Juan Antiguo has 7 subbarrios. In 2010, San Juan Antiguo had a population of 7,085 inhabitants and a population density of 2,681.9 people per km2. San Juan Antiguo is located within the Isleta de San Juan, an island off the coast of Puerto Rico, connected to the mainland by bridges and a causeway.