Area Code 23 – St. Helena

Geographic Area Code 23 in St. Helena

The area code 23 is a geographic National Destination Code (NDC) assigned to the island of St. Helena, a British Overseas Territory in the South Atlantic Ocean. This code is part of the country calling code +290, which is administered by Sure South Atlantic (the designated national numbering plan administrator). The 23 prefix serves the capital, Jamestown, and the surrounding districts, including Half Tree Hollow, St. Paul's, and Blue Hill. It is the primary fixed-line code for the island's PSTN (Public Switched Telephone Network) subscribers.

St. Helena's numbering plan is compact: all fixed-line numbers consist of the area code (23) followed by a four-digit subscriber number, resulting in a total of six digits after the country code. For example, a number in Jamestown might be formatted as +290 23456 (where 23456 is the local number). When dialing locally within St. Helena, callers must include the full six-digit number, including the area code, even for calls within the same district. This is because the island operates as a single closed numbering plan, meaning the area code is an integral part of the local number.

For international callers, the dialing sequence is: + (or the international access code from your country, e.g., 011 from the US or 00 from most European countries) followed by 290 (the country code) and then the six-digit local number. For instance, to call a fixed line in Jamestown from the United States, you would dial 011 290 23456. From the UK, you would dial 00 290 23456.

It is important to note that St. Helena does not use trunk prefixes like '0' for domestic long-distance calls; the entire island is treated as one local area. Therefore, there is no need to drop a leading '0' when converting a local number to international format, as is common in many other countries.

As of recent years, the island has seen an expansion of mobile and VoIP services, but the 23 code remains dedicated to fixed-line services. There are no overlay codes or additional geographic area codes on the island; the 23 prefix is the sole geographic code. Callers should be aware that due to the island's remote location, international call quality may vary, but the PSTN infrastructure is reliable for both voice and fax services.

For businesses or residents in St. Helena, the 23 code is essential for establishing a local presence. When listing a number internationally, it is standard practice to write it as +290 23XX XX, where X represents the subscriber digits. Always ensure that you have the correct six-digit number, as omitting the area code will result in a failed call.