The primary coordinate point for San Antonio is located at latitude 18.4516 and longitude -66.9496 in Quebradillas Municipio.
The formal boundaries for the San Antonio encompass a land area of 0.65 sq. miles and a water area of 0 sq. miles.
Quebradillas Municipio is in the Atlantic time zone (GMT -4).
The San Antonio has a U5 Census Class Code which indicates populated place that is also a census designated place with the same name. It also has a Functional Status Code of "S" which identifies a statistical entity.