Area Code 9978 – Tokunoshima, Kagoshima

Overview of Area Code 9978

Area code 9978 is a geographic telephone code within the Japanese numbering plan, serving the town of Tokunoshima in Kagoshima Prefecture. Tokunoshima is one of the Amami Islands, located in the Ryukyu archipelago between Kyushu and Okinawa. The code is assigned to the island's fixed-line telephone services, including residential and business lines, and is managed under the jurisdiction of the Ministry of Internal Affairs and Communications (MIC) in accordance with ITU-T E.164 recommendations.

Geographic Coverage and Administration

The 9978 area code covers the entire island of Tokunoshima, which includes the administrative districts of Tokunoshima Town, Isen Town, and Amagi Town. The island is part of the Amami Islands, a UNESCO World Heritage site known for its subtropical forests and coral reefs. The code is used for local calls within the island and is also used for calls to nearby islands that share the same area code, such as Okinoerabu and Kikaijima, which are part of the same charging group.

Dialing Formats and Instructions

For local callers within Tokunoshima, the area code is often omitted when dialing another local number. However, for calls from other parts of Japan, the full national format is required: 0-9978-X-XXXX, where the total number of digits after the leading 0 is 10 (including the area code). For example, a local number might be 0-9978-2-3456. When dialing from abroad, callers must use the international format: +81-9978-X-XXXX, replacing the leading 0 with the country code +81. For instance, an international caller would dial +81 9978 2 3456.

Overlay and Numbering Considerations

Currently, there is no overlay code for Tokunoshima, meaning that 9978 is the sole area code for the island. The number length after the area code is typically 6 digits, but some older lines may have 5 digits. In 2023, Japan's MIC announced a plan to increase the total number of digits for fixed-line numbers to 11 digits by 2025 to address the exhaustion of numbers, but this change will not affect the area code structure. Instead, the subscriber number will be expanded. For now, users should continue to dial the existing format.

Caller Instructions

For local callers within Tokunoshima, simply dial the subscriber number (without the area code) if it is a local call. For long-distance calls from other Japanese cities, dial 0 followed by 9978 and the subscriber number. International callers should dial their country's exit code, then 81 (Japan's country code), then 9978 and the subscriber number, omitting the leading 0. Always verify the subscriber number length, as it may vary.