The municipality of San Juan is divided into 18 barrios, 16 of which fall within the former (until 1951) municipality of Río Piedras.
Eight of the barrios are further divided into subbarrios,[1] and they include the two barrios that originally composed the municipality of San Juan (namely, San Juan Antiguo and Santurce).
[2][3][4] San Juan Antiguo is a barrio in the municipality of San Juan and it is divided into seven subbarrios: Santurce is a barrio in the municipality of San Juan.
Its population in 2020 was 69,469.
Santurce is divided into 40 subbarrios: