Caribbean countries inside the +1 numbering plan

More than a dozen Caribbean countries and territories have North American area codes, but dialing them is usually not a domestic call.

Why Caribbean countries use +1

Over the decades the North American Numbering Plan's Caribbean membership grew, with each country receiving a three-digit code from the same pool used by US states and Canadian provinces. Each is a full NANP member today. That is why a Jamaican number and a New Jersey number have the same shape: country code 1, area code, three-digit exchange, four-digit line. The region once shared a single code, 809; as demand grew each country received its own, and 809 now serves the Dominican Republic alongside 829 and 849.

Which places have +1

Same shape, different billing

Inside the NANP these numbers are dialed with a leading 1 and ten digits, exactly like a domestic US call: 1-876-555-0142 reaches Jamaica. The similarity ends there. For most US carriers a call to a foreign NANP country is an international call: it may be billed per minute, it may be excluded from domestic calling plans, and it may not be covered by an international add-on. Your phone will happily dial it without warning.

Not US domestic calls

Two exceptions deserve care. Puerto Rico and the US Virgin Islands are US territories, and most US carriers treat calls to them as domestic. Elsewhere in the region, from Jamaica and Trinidad and Tobago to Barbados and the Cayman Islands, treat the call as international unless your plan explicitly says otherwise. Prepaid balances can drain quickly at international rates.

From outside the NANP

The format is exit code + 1 + area code + number, the same as calling the United States or Canada. Someone in Britain calling Jamaica dials 00 1 876 555 0142. The country code is still 1, because the Caribbean countries are NANP members; there is no separate country code for each island.

Places that are not on +1

Not every Caribbean destination belongs to the plan. Haiti uses 509, Cuba uses 53, Aruba uses 297, Curacao and Bonaire use 599, Guadeloupe uses 590 and Martinique uses 596. If the number you are calling does not start with +1, the pattern above does not apply.

Why the code does not pin the island

Area codes do not always identify one place on a map. The Dominican Republic has three codes over one territory, Jamaica has two, and internet telephony means a number can be answered far from where it was issued. Use the area code as a strong clue, then confirm the destination before you send anything important.