Area Code 1549 – Kushiro, Hokkaido

Overview of Area Code 1549

Area code 1549 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, the northernmost prefecture of Japan. This code is used for fixed-line (PSTN) services and is administered under the ITU-T E.164 international standard. The full international dialing format for numbers in this region is +81 1549 XXX XXX, where the national significant number (NSN) is 10 digits in length, comprising the area code (4 digits) and the subscriber number (6 digits).

Geographic Coverage and Administrative Jurisdiction

The 1549 area code serves the Kushiro Subprefecture, which includes Kushiro City (the largest city in the region), as well as the towns of Kushiro-cho, Shiranuka-cho, and portions of the surrounding rural districts. This area is known for its port, fishing industry, and proximity to Kushiro Marsh National Park. The region is governed by the Kushiro Subprefectural Bureau, and the telephone service is primarily provided by NTT East, the regional incumbent carrier.

Dialing Formats and Caller Instructions

• Local calls (within the 1549 area): Dial the 6-digit subscriber number directly. For example, to reach a local number 123456, dial 123456.
• National calls (from other areas in Japan): Dial 0 followed by the area code and subscriber number. For instance, from Tokyo, dial 01549 123456.
• International calls (from outside Japan): Dial your country's international access code (e.g., 011 from the US, 00 from most European countries), then Japan's country code 81, followed by the area code without the leading zero, and the subscriber number. For example, from the US, dial 011 81 1549 123456.

Overlay and Numbering Considerations

As of the latest ITU-T data, the 1549 area code does not have an overlay code; it remains a standalone geographic code. However, Japan's numbering plan allows for the introduction of overlays when number exhaustion is imminent. Users in the Kushiro area should be aware that the area code is an integral part of the national dialing procedure, and omitting it when calling from outside the region will result in a failed call.

Services and Usage

Numbers under 1549 are primarily used for fixed-line residential and business services. They are also used for fax and ISDN lines. With the rise of VoIP and mobile services, some businesses may use these numbers for virtual offices, but the code remains tied to the geographic location for emergency services (110 for police, 119 for fire/ambulance) and for number portability purposes. When calling from abroad, it is essential to use the correct international format to ensure proper routing through the PSTN.