Publication 28 - Postal Addressing Standards > Appendix I > I2 Address Formats
Puerto Rico’s common addressing style consists of various formats.
Some areas in Puerto Rico do not have street names or repetitive house numbers. The urbanization name substitutes as the street name and becomes the primary identifier in the AMS files.
There are also public housing projects (residenciales) without street names or repetitive apartment numbers. In these cases the apartment number is the primary number and the name of the public housing project becomes the street name.