Area Code 3457 – Cayman Islands
The phone area code for Cayman Islands is 3457 (international format +13457). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 3457
Select a central office code to view local carrier data and detailed information
Geographic Coverage and Administration
The +1 3457 numbering block is a geographic allocation within the North American Numbering Plan (NANP), specifically assigned to the Cayman Islands, a British Overseas Territory in the Caribbean. This prefix is part of the broader country code +1 345, which serves the entire territory. The 3457 range is administered under the jurisdiction of the Cayman Islands' Information and Communications Technology Authority (ICTA), which oversees numbering resources in compliance with NANP guidelines. The islands of Grand Cayman, Cayman Brac, and Little Cayman all fall under this numbering area, with the majority of subscribers concentrated in George Town, the capital, and the West Bay and Bodden Town districts on Grand Cayman.
Dialing Formats and Caller Instructions
For international callers, the correct format is +1 345 7XX XXXX (or 011 1 345 7XX XXXX when dialing from countries using international prefix 011, such as the United States). Within the Cayman Islands, local calls require only the seven-digit number: 7XX XXXX. However, due to the NANP's integrated dialing plan, callers from other NANP countries (e.g., the United States, Canada, and many Caribbean nations) must dial 1 345 7XX XXXX, as the trunk prefix '1' is mandatory for inter-NANP calls. For example, a call from Miami to a Cayman Islands number would be dialed as 1 345 745 1234, while a call from London would be 00 1 345 745 1234.
Numbering and Overlay Considerations
The 345 area code is the sole area code for the Cayman Islands, and no overlay code has been introduced. As a result, all numbers within the territory share the same geographic significance. The '7' digit in the prefix (3457) is a Central Office Code (CO Code) that identifies a specific exchange or service provider. This exchange may serve a particular district or be allocated to a carrier for mobile or fixed-line services. It is important to note that while the Cayman Islands is part of the NANP, it is not part of the U.S. telecommunications regulatory framework; therefore, calls to these numbers are subject to international tariffs when dialed from the United States, despite using the familiar '+1' country code.
Practical Usage and Examples
Businesses and residents in the Cayman Islands often use numbers in the 3457 range for both fixed-line and mobile services. When providing a Cayman Islands contact to international clients, always include the full international format: +1 345 7XX XXXX. For example, a hotel in Seven Mile Beach might list its reservation line as +1 345 745 6789. Visitors to the islands can dial local numbers directly from their mobile phones if they have a local SIM or roaming plan, but should be aware that roaming charges may apply. For callers within the Cayman Islands, no area code is needed for local calls, but if you are dialing from a mobile phone, it is advisable to include the area code to ensure proper routing.