Area Code 9789 – Kitsuki, Oita

Overview of Area Code 9789

Area code 9789 is a geographic National Destination Code (NDC) within the Japanese numbering plan, assigned to the city of Kitsuki in Oita Prefecture, located on the island of Kyushu. This code is part of the broader 0978 numbering area, which historically served the northern coastal region of Oita Prefecture, including the cities of Kitsuki, Kunisaki, and parts of Bungotakada. The 9789 prefix is used for fixed-line (PSTN) and fixed VoIP services registered within this geographic area.

Geographic Coverage and Administrative Jurisdiction

The 9789 area code covers the administrative jurisdiction of Kitsuki City, which was formed in 2005 through the merger of the former town of Kitsuki with the villages of Yamaga and Matama. The area is known for its historic castle town, samurai residences, and scenic coastal landscapes. The code also serves the surrounding rural communities and business districts within the city limits. For administrative purposes, the area falls under the Oita Prefectural Government, and the local telephone service is primarily provided by NTT West, with alternative carriers offering services via interconnection.

Dialing Formats and Caller Instructions

When calling a fixed-line number in Kitsuki from within Japan, you must dial the area code followed by the subscriber number. For example, to reach a local number such as 123-4567, you would dial 0978-9-123-4567 (the area code is 0978, and the 9 is the first digit of the subscriber number). However, the official area code for Kitsuki is 9789, and when dialing from abroad, you must drop the leading zero and use the international format: +81 9789 123 456 (or +81 978-9-123-456). It is important to note that the subscriber number length can vary, but the total number of digits after the country code is typically 10 (including the area code without the leading zero).

For local callers within the same area code, it is possible to dial the subscriber number without the area code, but this is not recommended for clarity. For callers from other parts of Japan, dial 0978-9-XXX-XXX. For international callers, always use +81 9789 XXX XXX.

Overlay and Numbering Considerations

As of 2025, there is no overlay plan for the 9789 area code; it remains a standalone geographic code. However, with the increasing adoption of VoIP, some numbers may be allocated to services that are not physically located in the area, but they retain the geographic code for regulatory and numbering consistency. Mobile numbers in Japan always begin with 070, 080, or 090 and are not tied to geographic areas, so 9789 is exclusively for fixed-line services.

Practical Examples

• Local call (within Kitsuki): 123-4567 (if supported) or 0978-9-123-4567.
• National call (from Tokyo): 0978-9-123-4567.
• International call (from the US): +81 9789 123 456.

When dialing from a mobile phone in Japan, the same national format applies. Always ensure you have the correct country code (+81) when dialing from abroad.