Area Code 134 – Otaru, Hokkaido

Geographic Coverage and Administrative Jurisdiction

Area code 134 is a geographic National Destination Code (NDC) assigned to the city of Otaru and its surrounding municipalities within the Shiribeshi Subprefecture of Hokkaido, Japan. The code serves the administrative jurisdictions of Otaru City, as well as the towns of Yoichi, Niki, and Furubira in Yoichi District. The service area is located along the Ishikari Bay coast, approximately 30 kilometers west of Sapporo, the prefectural capital. Otaru is a historic port city known for its canal district and herring fisheries, while the surrounding towns are primarily residential and agricultural communities.

Dialing Formats and Number Structure

When dialing from within Japan, subscribers in the Otaru area use the domestic trunk prefix '0' followed by the area code '134' and the local subscriber number. The complete domestic format is 0-134-XX-XXXX, where the subscriber number consists of six digits. For example, a local call to a business in Otaru would be dialed as 0134-XX-XXXX. From outside Japan, callers must replace the leading '0' with the Japanese country code '+81', resulting in the international format +81-134-XX-XXXX. When dialing internationally, the area code is used without the leading zero. For instance, a caller from the United States would dial 011-81-134-XX-XXXX, while callers from most European countries would use 00-81-134-XX-XXXX.

Local and Long-Distance Calling Instructions

Within the Otaru area code region, calls between subscribers sharing the same area code are typically local calls and do not require the area code when dialing from a fixed-line phone. However, due to the implementation of closed numbering plans in Japan, all calls, including local ones, may require the full 10-digit number (area code + subscriber number) depending on the carrier and service. For callers outside the 134 area code but still within Japan, the domestic trunk prefix '0' must be used. For example, a caller in Sapporo (area code 011) would dial 0134-XX-XXXX to reach Otaru. Foreign callers should always use the international format, ensuring they omit the leading '0' from the area code.

Overlay and Numbering Plan Considerations

As of the latest ITU-T E.164 national numbering plan updates, area code 134 does not have an overlay code. The region continues to use the original 134 code exclusively. However, Japan's Ministry of Internal Affairs and Communications (MIC) has been promoting number portability and IP-based services, which may affect routing but not the geographic significance of the code. Subscribers in the Otaru area can retain their numbers when switching between fixed-line carriers, and the code remains associated with the geographic location for emergency services and caller identification purposes.