Area Code 37 – Aust-Agder
The phone area code for Aust-Agder is 37 (international format +4737). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 37
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Aust-Agder
Geographic Overview
The +47 37 prefix is a geographic National Destination Code (NDC) assigned to the Aust-Agder region in southern Norway. This area encompasses the traditional district of Aust-Agder, which includes the coastal towns of Arendal, Grimstad, Lillesand, and Tvedestrand, as well as inland municipalities like Froland and Vegårshei. The code serves both residential and business fixed-line subscribers within this administrative and historical county. Note that since 2020, Aust-Agder has been part of the larger Agder county, but the 37 prefix remains exclusively associated with the former Aust-Agder territory.
Dialing Formats and Usage
When calling a fixed-line number in Aust-Agder from within Norway, the standard national format is 37 XX XX XX (8 digits in total, including the leading 37). For international callers, the number must be dialed as +47 37 XX XX XX, where +47 is Norway's country calling code. The prefix 37 is not an area code in the traditional sense; rather, it is a geographic NDC that is part of the subscriber number. This means that no separate trunk prefix (0) is used when dialing domestically; you simply dial the 8-digit number directly.
Numbering Plan and Overlay Considerations
Norway's numbering plan is closed and non-geographic in structure, but geographic NDCs like 37 are allocated to specific regions. There are no overlay codes in Norway; each geographic area has a unique NDC. However, number portability allows subscribers to retain their 37 numbers when moving to other parts of the country, though the number's geographic association remains. This can occasionally lead to a 37 number being served by an exchange outside Aust-Agder, but for caller identification and billing purposes, the number is still treated as a geographic call.
Caller Instructions
Local callers within Aust-Agder can dial the 8-digit number directly, as can all callers within Norway. International callers must use the international prefix of their country (e.g., 00 from most European countries, 011 from the US/Canada) followed by 47 and the 8-digit number. For example, to call a fixed line in Arendal, you would dial +47 37 00 00 00 (replace with the actual number).
Practical Considerations
Calls to 37 numbers are typically charged at standard national rates when dialed from within Norway, and at international rates when dialed from abroad. Emergency services (110, 112, 113) are always free and do not require the area code. For businesses, having a 37 number can enhance local presence and trust among customers in the Aust-Agder region. As Norway continues to migrate to IP-based telephony, the 37 prefix remains fully functional for both traditional PSTN and VoIP services.