Area Code 2140 – Oslo
The phone area code for Oslo is 2140 (international format +472140). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 2140
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Oslo
Overview of Area Code 2140 (Oslo, Norway)
Area code 2140 is a geographic National Destination Code (NDC) assigned to the capital region of Norway, specifically the city of Oslo. In the Norwegian numbering plan, geographic area codes are structured as NDC + subscriber number, with a total length of 8 digits for subscriber numbers when the country code (+47) is included. This means that numbers beginning with 2140 are part of the Oslo fixed-line telephony network, operated by various licensed telecommunications providers.
Dialing Formats and Usage
When dialing a number with the prefix 2140 from within Norway, you must include the full 8-digit number, as Norwegian numbers do not use a trunk prefix like '0'. For example, if the subscriber number is 2140XXXX, you would dial 2140XXXX directly. From abroad, you would dial the international access code (e.g., 00 from most European countries, 011 from the US), followed by the country code +47, and then the 8-digit number: +47 2140XXXX. It is important to note that the leading '2' in the NDC is not dropped when dialing internationally, as is the case in some countries.
Geographic Coverage and Administrative Jurisdiction
Oslo, the capital and most populous city of Norway, serves as the administrative and economic hub. The 2140 area code covers the central and surrounding districts of Oslo, including major business districts, government institutions, and residential areas. The city is divided into several boroughs, and numbers with the 2140 prefix are allocated to fixed-line services, including PSTN and VoIP-based fixed lines that are registered to physical addresses within the Oslo region.
Numbering and Overlay Considerations
Norway employs a closed numbering plan, meaning that all subscriber numbers, whether fixed or mobile, are 8 digits long. There is no separate trunk prefix, and the country code +47 is used for all international calls. Oslo has multiple geographic area codes, including 21, 22, 23, 24, and others, which are assigned based on historical capacity and provider allocations. Overlays are not an issue in Norway because the numbering plan is uniform across the country; area codes are not used for local dialing decisions but rather for routing and identification.
Caller Instructions
For local callers within Oslo, dialing a 2140 number requires only the 8-digit number. For callers from other parts of Norway, the same applies—no trunk prefix is needed. International callers must use the +47 country code followed by the full 8-digit number. It is recommended to store numbers in international format (+47 2140XXXX) for clarity, especially when traveling or using VoIP services.