Area Code 2389 – Yonezawa, Yamagata

Overview of Area Code 2389

Area code 2389 is a geographic National Destination Code (NDC) within the Japanese numbering plan, assigned to the city of Yonezawa in Yamagata Prefecture. This code is part of the larger 0238 area code group, which covers the Yonezawa and Okitama region. Specifically, 2389 serves the central and eastern parts of Yonezawa city, including the city center and surrounding residential areas. The code is administered under the ITU-T E.164 standard, with the full international dialing format being +81 2389 XXXX (where XXXX is the subscriber number).

Geographic Coverage and Jurisdiction

Yonezawa is a historic castle town located in the southern part of Yamagata Prefecture, known for its textile industry and annual snow festival. The 2389 area code covers the urban core of Yonezawa, including districts such as the central commercial area, the Yonezawa Station vicinity, and key administrative zones. Neighboring areas use different codes: for instance, the northern part of Yonezawa and the town of Takahata use 2388, while the southern part of the Okitama region uses 2343. This division is based on the historical telephone exchange boundaries established by Nippon Telegraph and Telephone (NTT).

Dialing Formats and Instructions

For local callers within the Yonezawa area (i.e., when dialing from another number with the same area code 2389), the subscriber number is dialed directly without the area code. For example, to call a local number 1234-5678, you would simply dial 1234-5678.

For callers from other parts of Japan (outside the 2389 area), you must dial the trunk prefix 0, followed by the area code and subscriber number: 0-2389-XXXX. For instance, to call a Yonezawa number 1234-5678 from Tokyo, you would dial 02389-1234-5678.

For international callers, the format is +81 2389 XXXX (or +81 2389-XXXX), omitting the leading zero. For example, to call the same number from the United States, you would dial +81 2389 1234-5678.

Overlay and Numbering Considerations

Currently, there is no overlay code for the 2389 area; the code is exclusively used for Yonezawa. However, as part of Japan's ongoing numbering plan adjustments, some areas have introduced 10-digit dialing for mobile and IP services, but for fixed-line geographic numbers, the 0+NDC+subscriber number format remains standard. Subscriber numbers in the 2389 area are typically 4 to 6 digits long, but within the NDC, the total length of the national significant number (NSN) is always 10 digits (excluding the trunk prefix 0).

Practical Guidance for Callers

• Local callers: Dial the 4-6 digit subscriber number directly.
• Domestic long-distance callers: Dial 0-2389-XXXX.
• International callers: Dial +81 2389 XXXX.

When dialing from a mobile phone in Japan, the same domestic format applies, but be aware that mobile numbers have their own prefixes (e.g., 090, 080) and are not affected by geographic area codes. For businesses or individuals in Yonezawa, it is essential to display the number in international format (+81 2389 XXXX) on websites and marketing materials to facilitate calls from overseas partners and customers.