Area Code 1235 – Yubari, Hokkaido

Overview of Area Code 1235

Area code 1235 is a geographic National Destination Code (NDC) assigned to the city of Yubari and its surrounding areas in the Sorachi Subprefecture of Hokkaido, Japan. This code is part of the Japanese numbering plan administered by the Ministry of Internal Affairs and Communications (MIC) and follows the ITU-T E.164 international standard. When dialing from abroad, the code is used as +81 1235, while within Japan it is dialed as 01235 (including the trunk prefix 0).

Geographic Coverage and Administrative Jurisdiction

The 1235 area code serves the city of Yubari, which was historically a coal mining center and is now known for its tourism, particularly the Yubari Melon and the Yubari Resort. The code also covers the neighboring town of Kuriyama in the Yubari District. Administratively, these areas fall under the jurisdiction of the Hokkaido Prefectural Government. The region is characterized by mountainous terrain and a declining population, which influences the relatively small number of subscribers compared to major metropolitan areas.

Dialing Formats and Caller Instructions

For local callers within the same area code, the subscriber number is dialed without the area code. However, because the area code is 5 digits (including the leading 0), the full national number is 10 digits: 0 + 1235 + 5-digit subscriber number. For example, a local call to a subscriber number 45678 would be dialed as 45678. When calling from another area code within Japan, you must dial the trunk prefix 0, then the area code 1235, followed by the subscriber number: 0123-45-6789 (hyphens for readability). International callers from outside Japan should dial the international access prefix (e.g., 011 from the US, 00 from most countries), then Japan's country code 81, then the area code without the leading 0 (1235), and finally the subscriber number. For instance, to call a number in Yubari from the United States, you would dial: 011 81 1235 456789.

Overlay and Numbering Considerations

As of 2023, there is no overlay plan for the 1235 area code; it remains a standalone code. However, with the migration of NTT East and NTT West networks to IP-based services, some subscribers may have VoIP lines that are not tied to a physical location. In such cases, the number may be used outside the geographic area, but the code still officially represents the Yubari region. Callers should be aware that when dialing from a mobile phone in Japan, the same national format (01235-456789) is used, but international callers must always include the country code and drop the leading zero.