Area Code 2563 – Sanjo, Niigata
The phone area code for Sanjo, Niigata is 2563 (international format +812563). Browse local exchange codes (NXX) and carrier assignments below.
📍 Geographic Location of Sanjo, Niigata
Overview of Area Code 2563
Area code 2563 is a geographic National Destination Code (NDC) within the Japanese numbering plan, assigned to the city of Sanjo in Niigata Prefecture. This code is part of the larger Niigata area code cluster (025), which was subdivided to accommodate the region's telecommunication needs. Specifically, 2563 serves the central and eastern districts of Sanjo, a city known for its metalworking and manufacturing industries, located approximately 250 kilometers north of Tokyo.
Geographic Coverage and Administrative Jurisdiction
The 2563 area code covers the majority of Sanjo City, including its main urban center and surrounding residential neighborhoods. Sanjo is administered under Niigata Prefecture and is bordered by the cities of Tsubame and Kamo. The code also extends to parts of the neighboring town of Aga, which falls under the Higashikanbara District. This allocation is managed by the Ministry of Internal Affairs and Communications (MIC) and the Telecommunications Carriers Association (TCA).
Dialing Formats and Caller Instructions
For local callers within the 2563 area code, the number is dialed as an 8-digit local number, omitting the area code. For example, a local call to a subscriber would be dialed as 1234-5678. However, when calling from outside the 2563 area code but still within Japan, the full national trunk prefix and area code must be used: 025-63-1234-5678 (note that the area code is 025, and the subscriber number begins with 63, which is the central office code). For international callers, the format is +81 25-63-1234-5678, where the leading zero of the area code is dropped.
Overlay and Numbering Considerations
Currently, there is no overlay plan for the 025 area code cluster, meaning that 2563 is the sole code for its designated area. However, as part of Japan's numbering plan, the 025 area code covers a broad region including Niigata City and several surrounding municipalities. The 2563 code is specifically allocated to the Sanjo exchange, and number portability is not available for geographic numbers in Japan, so subscribers cannot retain their number if they move outside the exchange area.
Caller Guidance
For local callers within Sanjo, simply dial the 8-digit subscriber number. For callers from other parts of Japan, dial 025-63-XXXX-XXXX. For international callers, dial +81 25-63-XXXX-XXXX. Always ensure you include the correct country code and drop the leading zero of the area code when dialing from abroad.