Area Code 517 – Harlingen
The phone area code for Harlingen is 517 (international format +31517). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 517
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Harlingen
Overview of Area Code 517
Area code 517 is a geographic National Destination Code (NDC) within the Netherlands' national numbering plan, allocated under the country calling code +31. It serves the municipality of Harlingen and its surrounding areas in the province of Friesland (Fryslân). This region is located in the northern part of the Netherlands, along the Wadden Sea coast. The code covers the town of Harlingen itself, as well as nearby villages and rural areas that fall within the same telephone exchange area.
Geographic Coverage and Administration
The 517 area code is assigned to the telecom region historically centered on Harlingen, which is part of the larger Friesland province. The area includes not only the urban center of Harlingen but also smaller communities such as Midlum, Wijnaldum, and parts of the surrounding countryside. Administratively, the code is managed under the Dutch regulatory framework, with numbers allocated to local fixed-line operators. As with all geographic codes in the Netherlands, the prefix is tied to a physical location, and calls are routed based on the subscriber's address.
Dialing Formats and Usage
For local callers within the Netherlands, the number is dialed as 0517 followed by the subscriber's six-digit local number, making a total of ten digits (including the leading zero). For example, a local number might be 0517 123456. When calling from abroad, the international format is used: +31 517 123456, omitting the leading zero. The area code is used for both fixed-line and, in some cases, VoIP services that are registered to a physical address in the region. It is important to note that this is a geographic code, so it is not used for mobile numbers, which have their own non-geographic prefixes (e.g., 06).
Caller Instructions
If you are calling from within the Netherlands, simply dial the full national number including the trunk prefix '0' (e.g., 0517 123456). If you are calling from outside the Netherlands, replace the leading zero with the international access code and the country code: dial +31 517 123456. For example, from the United States, you would dial 011 31 517 123456. Always verify the local number length, as it may vary, but it is typically six digits after the area code.
Overlay and Numbering Considerations
Currently, there is no overlay plan for area code 517, meaning that the code is unique to the Harlingen area. However, as with all Dutch geographic codes, number portability allows subscribers to retain their numbers when switching providers, even if they move within the same rate center area. This ensures that the geographic association remains intact for routing purposes. For businesses, having a 517 number can signal a local presence in Harlingen, which may be beneficial for customer trust and local marketing.