How to call Puerto Rico from the USA or from Canada:

dial 1 + 787 (939) + local phone number

Calling from another country?

The time in Puerto Rico is now 12:48:57am

Calling Puerto Rico from the United States explained:

1 - Country Code for Puerto Rico
787/939 - area codes within the NANP
local phone number - 7 digits
US to Puerto Rico international dialing format: 1 787 (939) ??? ????
this US territory is part of the North American Numbering Plan - NANP (calling it works like a US state to state call)

Phone Books:

InfoPaginas - directory of businesses and institutions
SuperPages Puerto Rico - comprehensive phone book