Area Code 1546 – Kushiro, Hokkaido

Overview of Area Code 1546

Area code 1546 is a geographic National Destination Code (NDC) within the Japanese numbering plan, assigned to the city of Kushiro and its surrounding areas in the southeastern part of Hokkaido, Japan's northernmost main island. This code is used for fixed-line (PSTN) services and is administered under the ITU-T E.164 international standard. When dialing from abroad, the full international format is +81 1546 XXXXX, where the leading zero of the national prefix is omitted.

Geographic Coverage and Administrative Jurisdiction

The 1546 area code serves the city of Kushiro, which is the largest city in the Kushiro Subprefecture, and includes neighboring municipalities such as Kushiro Town, Shiranuka, and Tsurui. Kushiro is a major port city and the economic center of eastern Hokkaido, known for its fishing industry and the Kushiro Wetland, a designated Ramsar site. The region is governed by the Kushiro Subprefectural Bureau, and the area code is allocated to the local exchange network operated by NTT East, the dominant fixed-line carrier in the region.

Dialing Formats and Caller Instructions

For local callers within the same area code, the number is dialed as an 8-digit local number: 1546-XXXXX (where X represents the subscriber number). For callers from other regions within Japan, the full national format is used: 0-1546-XXXXX. International callers must replace the leading zero with Japan's country code, resulting in +81 1546 XXXXX. For example, a local number such as 1546-12345 would be dialed as +81 1546 12345 from overseas. It is important to note that Japan's numbering plan does not use trunk prefixes like '1' in North America; the '0' is the national trunk prefix.

Overlay and Numbering Considerations

As of the latest ITU-T allocations, there is no overlay code for the 1546 area; it remains a standalone geographic code. However, Japan's Ministry of Internal Affairs and Communications (MIC) periodically reviews numbering resources, and future overlays are possible if number exhaustion occurs. For now, callers should always use the 10-digit national number (including the leading zero) when dialing from outside the area, and the 8-digit local number when dialing within the same area code. Mobile numbers in Japan are not tied to geographic areas and use separate prefixes such as 090, 080, and 070.

Practical Usage for Domestic and International Callers

For businesses and individuals in Kushiro, the 1546 code is essential for local customer service and administrative communications. When calling from abroad, ensure you have the correct country code (+81) and drop the leading zero. For example, to call a Kushiro-based hotel with the number 1546-78901, you would dial +81 1546 78901. Always verify the number length: local numbers in this area consist of 5 digits after the area code, making the total national number 10 digits (including the trunk prefix). International callers should also be aware of time zone differences (Japan Standard Time, UTC+9) and potential carrier-specific dialing requirements.