Area Code 2780 – Maebashi, Gunma

Overview of Area Code 2780

Area code 2780 is a geographic National Destination Code (NDC) within the Japanese numbering plan, assigned to the city of Maebashi, the capital of Gunma Prefecture, located in the Kanto region of Honshu, Japan. This code is part of the Maebashi telephone exchange area, which encompasses the central and eastern districts of the city, including the former town of Ogo and surrounding suburban communities. The service area is administered by NTT East, the regional incumbent carrier, and supports both fixed-line PSTN and IP-based telephone services.

Dialing Formats and Usage

When calling a Maebashi number from within Japan, the domestic trunk prefix '0' is dialed followed by the area code and the subscriber number. The full domestic format is 0-2780-XXXXXX, where the subscriber number consists of six digits, resulting in a total of ten digits when the leading '0' is included. For example, a typical Maebashi landline number might be 0278-012345 (note: the area code is often written as 0278 in local directories, but the NDC is 2780 when the leading '0' is omitted).

For international callers, the country code for Japan is +81. The leading '0' of the domestic prefix is dropped, so the international format becomes +81-2780-XXXXXX. Thus, to call a Maebashi number from abroad, one would dial, for instance, +812780123456 (assuming the subscriber number is 123456). It is crucial to omit the initial '0' when dialing from outside Japan.

Geographic and Administrative Context

Maebashi is the political and economic hub of Gunma Prefecture, with a population exceeding 330,000. The 2780 area code serves the city's central business district, government offices, and residential neighborhoods. Historically, Maebashi was a castle town and a center for silk production; today, it is known for its universities and as a gateway to nearby mountainous resorts. The area code is not overlaid with any other NDC, meaning that local calls within the Maebashi exchange area do not require an additional area code when dialing between subscribers in the same zone.

Caller Instructions

• Local callers (within Maebashi): Dial the six-digit subscriber number directly (e.g., 123456).
• Domestic callers (outside Maebashi): Dial 0-2780-XXXXXX (e.g., 0278-123456).
• International callers: Dial your country's exit code, then 81, then 2780, then the six-digit subscriber number (e.g., +81 2780 123456).

This numbering structure aligns with ITU-T E.164 recommendations, ensuring unambiguous routing for both national and international telecommunications networks.