Area Code 2746 – Tomioka, Gunma

Geographic Overview

The +81 2746 area code is a geographic National Destination Code (NDC) assigned to the city of Tomioka and its surrounding areas in Gunma Prefecture, Japan. This region is part of the Kanto Plain, located approximately 100 kilometers northwest of Tokyo. Tomioka is historically significant as the site of the Tomioka Silk Mill, a UNESCO World Heritage Site, and serves as a local commercial and administrative hub.

Dialing Formats

When calling a landline in Tomioka from within Japan, subscribers dial the domestic trunk prefix 0, followed by the area code 2746 and the subscriber number. The complete domestic format is 0-2746-X-XXXX, where the subscriber number typically consists of six digits, making the total number length ten digits including the leading zero.

For international callers, the country code +81 replaces the leading zero. The international format is +81 2746 X-XXXX. For example, a local number such as 12-3456 would be dialed as 0-2746-12-3456 domestically and +81 2746 12-3456 from abroad.

Local and Regional Significance

The 2746 area code covers not only Tomioka City but also the neighboring towns of Kanra and Shimonita, as well as parts of the surrounding rural districts. This numbering area is part of the larger Gunma prefectural network, which is subdivided into multiple area codes such as 27 (Maebashi), 274 (Takasaki), and 2746 (Tomioka). The Tomioka zone is considered a distinct local calling area, and calls between Tomioka and adjacent areas like Takasaki may be subject to different toll charges depending on the carrier's tariff structure.

Numbering and Overlay Considerations

As of the latest ITU-T E.164 allocation, the 2746 area code does not have an overlay code. Subscribers within the Tomioka area can dial local numbers without the area code when calling within the same zone. However, when calling from other parts of Japan, callers must include the trunk prefix and area code. The Japanese Numbering Plan is managed by the Ministry of Internal Affairs and Communications (MIC), and no major changes to this area code are anticipated in the near future.

Practical Guidance for Callers

For domestic callers outside the Tomioka area, the correct dialing sequence is: 0-2746-XXXXXX. For international callers, the sequence is: +81-2746-XXXXXX. It is important to note that the leading zero is not used when dialing from abroad. Additionally, when storing numbers in international format, always include the country code and omit the leading zero.