Area Code 23 – Turku/Pori
The phone area code for Turku/Pori is 23 (international format +35823). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 23
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Turku/Pori
Geographic Coverage and Administrative Jurisdiction
The Finnish national destination code (NDC) 23 is a geographic area code assigned to the Turku and Pori region, located in the southwestern part of Finland. This area encompasses the city of Turku (Åbo in Swedish), the regional capital of Southwest Finland, and the city of Pori, the capital of the Satakunta region. The code covers a significant portion of Finland's western coastline, including municipalities such as Raisio, Kaarina, Naantali, and Laitila, as well as the surrounding rural areas. Administratively, the region falls under the jurisdiction of the Regional State Administrative Agency for Southwestern Finland, which oversees public services and regulatory compliance in the area.
Dialing Formats and Number Structure
Within Finland, calls to numbers in the 23 area code require the use of the national trunk prefix 0 followed by the area code and the subscriber number. The complete national format is 0 23 XXX XXXX, where the subscriber number typically consists of 7 to 8 digits. For example, a local Turku number might be dialed as 023 123 4567 from anywhere in Finland. When calling from abroad, the international access code (00 or +) is used, followed by Finland's country code 358, the area code without the leading zero, and the subscriber number. Thus, the international format becomes +358 23 XXX XXXX. For instance, a caller from the United States would dial 011 358 23 123 4567.
Local and International Caller Instructions
For local callers within the Turku/Pori region, it is possible to dial only the subscriber number without the area code, provided the call is made within the same local calling area. However, due to the implementation of number portability and the expansion of mobile services, it is recommended to always include the area code to avoid misrouted calls. For international callers, it is essential to omit the leading zero of the area code when dialing from outside Finland. Additionally, callers should be aware that the plus sign (+) in the international format is a replacement for the international access code, which varies by country (e.g., 00 in most European countries, 011 in the United States).
Overlay Considerations and Numbering Plan Evolution
Currently, the 23 area code is not subject to an overlay plan, meaning that no additional area codes have been introduced for the same geographic region. However, the Finnish Transport and Communications Agency (Traficom) has implemented number portability across both fixed and mobile networks, allowing subscribers to retain their numbers when changing operators or moving within Finland. This has led to a situation where a number with the 23 prefix may not necessarily be physically located in the Turku/Pori area, as it could have been ported to a different region. Despite this, the prefix remains geographically associated with the area for administrative and routing purposes.