Area Code 2371 – Iserlohn
The phone area code for Iserlohn is 2371 (international format +492371). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 2371
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Iserlohn
Geographic Overview
The German area code 02371 (international format +49 2371) serves the city of Iserlohn, located in the Märkischer Kreis district of North Rhine-Westphalia. This region is part of the Sauerland, a low mountain range known for its industrial history and scenic landscapes. Iserlohn is the largest city in the district and serves as a commercial and cultural hub for surrounding communities.
The code covers not only the central urban area but also several incorporated districts and neighboring municipalities, including Letmathe, Hennen, and Kesbern. These areas were merged into Iserlohn during administrative reforms in the 1970s, and they all share the same dialing prefix.
Dialing Formats
When calling a landline in Iserlohn from within Germany, you must use the national trunk prefix 0 followed by the area code and the subscriber number. For example, a local number might be dialed as:
- 02371 123456 (national format)
- +49 2371 123456 (international format from abroad)
If you are calling from a German mobile phone, you can use either format, but the national format (with the leading 0) is standard. When dialing from another country, replace the leading 0 with the German country code +49 and drop the 0.
Local Numbering Structure
Subscriber numbers in the 02371 area typically have between 5 and 7 digits. The total length of the national significant number (NSN) is usually 10 or 11 digits, including the area code but excluding the trunk prefix. This allocation follows the ITU-T E.164 recommendation, ensuring unambiguous international dialing.
Overlay and Regulatory Notes
As of the latest regulatory updates, there is no overlay code for Iserlohn. The area code 02371 is exclusively assigned to geographic numbers in this region. The Federal Network Agency (Bundesnetzagentur) manages numbering resources, and number portability allows subscribers to retain their numbers when changing providers, though the geographic association remains tied to the original location.
Caller Instructions
For callers within Germany, simply dial 02371 followed by the subscriber number. For international callers, dial your country's exit code (e.g., 011 from the US, 00 from most European countries), then 49 2371, and the subscriber number. Remember to omit the leading 0 of the area code when calling from abroad.
Businesses and residents in Iserlohn often use these numbers for fixed-line services, and the area is well-connected via both PSTN and VoIP networks. When contacting local services, always verify the correct number length, as some older numbers may have fewer digits.