Area Code 787 – San Juan & Main Region
The phone area code for San Juan & Main Region is 787 (international format +1 787). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 787
Select a central office code to view local carrier data and detailed information
Geographic Coverage and Administrative Jurisdiction
Area code 787 is a geographic numbering plan area (NPA) serving the Commonwealth of Puerto Rico, an unincorporated territory of the United States. It covers the entire island, including the capital San Juan, as well as municipalities such as Bayamón, Carolina, Ponce, and Mayagüez. The code is assigned under the North American Numbering Plan (NANP), which means Puerto Rico shares country code +1 with the United States, Canada, and other Caribbean nations.
Dialing Formats and Caller Instructions
For local calls within Puerto Rico, callers must dial the 10-digit number: the area code (787) followed by the 7-digit subscriber number. For example, a local call to a San Juan number would be dialed as 787-555-0123. International callers from outside the NANP should dial their international access prefix (e.g., 011 in the US, 00 in most countries), followed by 1-787-555-0123. Callers from within the NANP (e.g., from mainland US) simply dial 1-787-555-0123.
Overlay and Numbering Plan Administration
In 2001, area code 939 was introduced as an overlay for the same geographic region to meet growing demand for telephone numbers. This means that a single location may have numbers with either 787 or 939 area codes, and 10-digit dialing is mandatory for all local calls. The Puerto Rico Telecommunications Regulatory Board (Junta Reguladora de Telecomunicaciones de Puerto Rico) oversees numbering resources, while the North American Numbering Plan Administration (NANPA) manages assignments.
Technical Considerations
As part of the NANP, 787 numbers support standard PSTN services, including VoIP and mobile services. Number portability is available, allowing subscribers to retain their 787 numbers when switching carriers. For international routing, calls to 787 are treated as calls to the United States, so they may be subject to US federal regulations and tariffs. Emergency services are reached by dialing 911, which routes to local public safety answering points.
Businesses and individuals using 787 numbers should ensure their telecommunications providers correctly route calls to Puerto Rico, especially for VoIP services that may require accurate E.164 formatting. When dialing from abroad, the plus sign (+) can be used in place of the international access prefix on mobile phones, simplifying the process: +1 787 555 0123.