Area Code 4702 – Tateyama, Chiba

Overview of Area Code 4702

Area code 4702 is a geographic National Destination Code (NDC) within the Japanese numbering plan, assigned to the city of Tateyama in Chiba Prefecture. It serves the Bōsō Peninsula's southern coastal region, including the city center and surrounding administrative districts. As part of the E.164 standard, the full international dialing format for numbers in this area is +81 4702 XXXX (or +81-4702-XXXX when separated for readability).

Coverage and Administrative Jurisdiction

The 4702 area code covers the Tateyama municipal area, which includes the former towns of Toyoda, Nago, and other merged localities. It is bordered by the Pacific Ocean to the south and east, and by the Minamibōsō city area to the west (which uses a different area code). The region is known for its coastal tourism, fishing industry, and the Tateyama Port. The city is part of the larger Chiba Prefecture, and the code is managed under the Ministry of Internal Affairs and Communications (MIC) of Japan.

Dialing Formats and Caller Instructions

For local callers within the Tateyama area, the area code is often omitted when dialing a local number, allowing direct 4-digit subscriber number dialing (e.g., XXXX). However, for calls from other parts of Japan, callers must dial the trunk prefix 0 followed by the area code and subscriber number: 0470-2-XXXX (note that the area code is officially 0470, but the second digit '2' is part of the subscriber number; the full national significant number is 04702XXXXX). For international callers, the format is +81 4702 XXXX (drop the leading '0').

Overlay and Numbering Considerations

Currently, there is no overlay code for the 4702 area; the region uses a single NDC. However, as part of Japan's numbering plan, the area code is part of a larger 0470 block that also covers other parts of Minamibōsō. Subscriber numbers in Tateyama typically have 4 digits, making the total national significant number 9 digits (including the leading 0). When dialing from a mobile phone, the same rules apply, and it is essential to include the area code for calls from outside the local area.

Practical Examples

• Local call (within Tateyama): Dial XXXX (subscriber number only).
• Domestic call from Tokyo: Dial 0470-2-XXXX.
• International call from the USA: Dial 011 81 4702 XXXX.
• International call from the UK: Dial 00 81 4702 XXXX.

Understanding these formats ensures accurate call routing and avoids misdials. For businesses in Tateyama, displaying the international format (+81 4702 XXXX) on websites and marketing materials is recommended to facilitate global communication.