Area Code 1558 – Hiroo, Hokkaido
The phone area code for Hiroo, Hokkaido is 1558 (international format +811558). Browse local exchange codes (NXX) and carrier assignments below.
📍 Geographic Location of Hiroo, Hokkaido
Geographic Overview
The +81 1558 area code serves the Hiroo region, located in the Tokachi Subprefecture of Hokkaido, Japan. This geographic code is assigned to the town of Hiroo and its surrounding areas, including the villages of Taiki and Nakasatsunai. The region is known for its agricultural industry, dairy farming, and scenic coastal landscapes along the Pacific Ocean. As a geographic numbering plan area, calls to +81 1558 are routed to fixed-line telephones within this specific administrative jurisdiction.
Dialing Formats
For local callers within Japan, the area code is dialed with a leading zero, followed by the subscriber number. The complete national format is 01558-X-XXXX, where X-XXXX represents the local subscriber number. This format is used for all calls originating from outside the Hiroo area but within Japan. For international callers, the country code +81 replaces the leading zero, resulting in the format +81 1558-X-XXXX. When dialing from abroad, you must drop the initial '0' of the area code. For example, a local number such as 01558-2-3456 would be dialed as +81 1558-2-3456 from overseas.
Caller Instructions
If you are calling from a foreign country, first 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 (1558), and finally the subscriber number. If you are calling from a mobile phone within Japan, you can typically dial the number in national format (01558-X-XXXX). For local calls within the Hiroo area, it is possible to dial only the subscriber number in some cases, but it is safer to always include the area code to avoid misrouting.
Overlay and Numbering Considerations
As of the latest ITU-T E.164 allocation, there is no overlay code for the Hiroo area. The 0158 area code is part of the Hokkaido numbering plan, which uses several area codes to cover different regions. The 1558 prefix is specifically assigned to the Hiroo exchange and is not used for mobile or VoIP services. All numbers under this prefix are geographic fixed-line numbers. When dialing from abroad, ensure you have the correct number of digits after the area code, as Japanese fixed-line numbers can vary in length. Always verify the complete number with the recipient to avoid connection errors.