Area Code 2747 – Tomioka, Gunma

Overview of Area Code 2747

Area code 2747 is a geographic National Destination Code (NDC) within the Japanese numbering plan, assigned to the city of Tomioka and its surrounding areas in Gunma Prefecture. This code is part of the larger 0274 area code region, which serves the western part of Gunma, including Tomioka, Annaka, and parts of Shimonita. The 0274 region was originally assigned to the Maebashi area, but due to the expansion of telephone services, the 2747 prefix was introduced to accommodate the growing demand for numbers in Tomioka and its environs.

Geographically, Tomioka is located in the southwestern part of Gunma Prefecture, approximately 100 kilometers northwest of Tokyo. The city is known for the Tomioka Silk Mill, a UNESCO World Heritage Site, and is an important regional center for commerce and industry. The area code 2747 covers the central and southern parts of Tomioka city, including the Tomioka Station area, and extends to nearby towns such as Kanra and Myogi. In some cases, the prefix may also serve parts of the neighboring city of Annaka, depending on the specific telephone exchange.

Dialing Formats and Instructions

For callers within Japan, dialing a number in the 2747 area code requires the format: 0274-7X-XXXX (where X represents digits). The leading '0' is the trunk prefix used for domestic calls. For example, a local number might be 0274-70-1234. When calling from overseas, the international format is +81 274-7X-XXXX, dropping the leading '0'. Thus, the same number would be dialed as +81 274-70-1234 from abroad.

It is important to note that the 0274 area code is not an overlay; it is a standalone code. However, within the 0274 region, there are multiple prefixes (such as 2740 through 2749) that serve different towns or exchanges. Therefore, callers must always include the area code when dialing from outside the immediate local calling area. Within the same area code region, local calls may be dialed without the area code, but this practice is becoming less common as Japanese telecom providers now require the full 10-digit number (including the area code) for all calls, even local ones, due to number portability and service integration.

For callers using mobile phones, it is standard to dial the full number with the area code, as mobile networks do not distinguish between local and long-distance calls. For international callers, the country code +81 must be used, followed by the area code without the leading zero, and then the subscriber number.

Administrative and Jurisdictional Details

The 2747 area code is administered by the Ministry of Internal Affairs and Communications (MIC) in Japan and is allocated to Nippon Telegraph and Telephone East (NTT East) for fixed-line services. The region falls under the Gunma Prefecture jurisdiction, and the city of Tomioka serves as the administrative center for the area. The numbering plan follows the ITU-T E.164 recommendation, ensuring global interoperability.

In summary, area code 2747 is a geographic code that identifies a specific region in Tomioka, Gunma. Whether you are a resident, business, or international caller, understanding the correct dialing format is essential for successful communication.