Area Code 1589 – Okoppe, Hokkaido

Overview of Area Code 1589

Area code 1589 is a geographic National Destination Code (NDC) within the Japanese numbering plan, assigned to the town of Okoppe (興部町) in the Okhotsk Subprefecture of Hokkaido, Japan. It covers the administrative region of Okoppe and its surrounding rural areas, including the town center and nearby settlements along the Okhotsk Sea coast. The code is part of the Hokkaido telephone area, which uses a variety of area codes to serve its municipalities.

Geographic Coverage and Jurisdiction

Okoppe is a town located in the northern part of Hokkaido, bordered by the Sea of Okhotsk to the north. The area code 1589 serves the town's telephone exchange, which is administered by NTT East (Nippon Telegraph and Telephone East). The region is primarily agricultural and fishery-based, with a small population, and the exchange serves both residential and business lines within the town limits.

Dialing Formats

When calling a landline in Okoppe from within Japan, you must dial the trunk prefix 0, followed by the area code 1589, and then the local subscriber number. The local subscriber number length in this area is 5 digits, making the total national significant number (NSN) length 9 digits (excluding the leading 0). The international format for calling from abroad is +81 1589 XXXXX, where the leading 0 is omitted. For example, a local number might be formatted as 01589 2-XXXX, and internationally as +81 1589 2-XXXX.

Caller Instructions

• Local callers (within Okoppe): To call another number in the same area code, you may dial the subscriber number directly without the area code, depending on the local dialing plan. However, for clarity and to avoid errors, it is recommended to dial the full national format (0-1589-XXXXX) even for local calls.
• Domestic callers (from other parts of Japan): Dial 0-1589-XXXXX.
• International callers: Dial your country's exit code (e.g., 011 from the US, 00 from most European countries), then Japan's country code 81, then the area code without the leading 0 (1589), followed by the subscriber number. For example, from the US, you would dial 011 81 1589 2-XXXX.

Overlay and Numbering Considerations

Currently, there is no overlay plan for area code 1589; it is the sole area code for Okoppe. However, as with all geographic codes in Japan, the numbering plan is subject to change, and future overlays or renumbering could occur. It is always advisable to verify the current dialing procedures with your telecom provider or the official NTT directory.

For businesses or individuals in Okoppe, it is important to note that numbers are tied to the physical location, and moving outside the area code region may require a number change unless number portability is applied (which is available for fixed lines in Japan under certain conditions).