: Famous for the Arecibo Observatory and local coastline.
: Home to the University of Puerto Rico at Mayagüez and a major western regional center.
: For mailing lists or data validation, services like Smarty can provide the most recent ZIP+4 database updates. ZIP Code™ Lookup | USPS
Below are some of the primary locations covered by this prefix:
: Known for the Rafael Hernández Airport and popular surfing beaches.
: Use the official USPS Look Up tool to find a specific +4 code or city by address.
