Area Code 66 – Akershus
The phone area code for Akershus is 66 (international format +4766). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 66
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Akershus
Geographic Coverage and Administrative Jurisdiction
The Norwegian country calling code +47 is paired with the geographic area code 66 to reach subscribers within the Akershus region. This area code covers the traditional county of Akershus, which surrounds the capital Oslo and includes key municipalities such as Bærum, Asker, Skedsmo, Lørenskog, and Ullensaker. Since 2020, Akershus has been administratively merged into the Viken county, but the 66 prefix remains a geographic identifier for the region, and its allocation is still recognized by the Norwegian Communications Authority (Nkom). The code serves both residential and business lines connected to the public switched telephone network (PSTN) and voice over IP (VoIP) services with fixed-line registration.
Dialing Formats and Caller Instructions
For local callers within Norway, the national significant number (NSN) for Akershus numbers consists of the area code 66 followed by an eight-digit subscriber number, resulting in a total of ten digits when dialed nationally. The format is: 66 XX XX XX XX. When calling from abroad, the international format requires the country code +47, followed by the area code without the leading zero (Norway does not use a trunk prefix), and the subscriber number: +47 66 XX XX XX XX. For example, a number in Bærum might be dialed as 66 12 34 56 locally, or +47 66 12 34 56 from outside Norway.
Overlay and Numbering Plan Considerations
Norway employs a closed numbering plan with no trunk prefix, and area codes are an integral part of the subscriber number. The 66 code is not overlaid by another geographic code; however, number portability allows subscribers to retain their 66 numbers when switching to a different operator or technology, including mobile or VoIP services. This means that a call to a 66 number may terminate on a mobile network if the subscriber has ported the number, but the geographic association remains for administrative and routing purposes.
Practical Guidance for Callers
For domestic callers outside the 66 area, dial the full ten-digit number starting with 66. For international callers, always replace the leading zero (if any) with the +47 country code. Ensure you have the correct eight-digit subscriber number, as Norwegian numbers are fixed-length. Akershus numbers are widely used by businesses, public institutions, and residents, and are an essential part of the region's telecommunications infrastructure.