Area Code 4291 – Hanno, Saitama

Overview of Area Code 4291

Area code 4291 is a geographic prefix within the Japanese numbering plan, specifically assigned to the city of Hanno and its surrounding areas in Saitama Prefecture. This code is part of the larger 42 geographic area code block that serves the western region of Saitama Prefecture, which includes cities such as Tokorozawa, Kawagoe, and Sayama. The 4291 prefix is used for fixed-line telephone services (PSTN) and is administered under the ITU-T E.164 international standard, with Japan's country calling code +81.

Geographic Coverage and Administrative Jurisdiction

The 4291 area code covers Hanno City and the neighboring towns of Moroyama and Ogose, all located in the western part of Saitama Prefecture. Hanno is a suburban city approximately 50 kilometers northwest of central Tokyo, known for its scenic mountains and outdoor recreational areas. The administrative jurisdiction falls under the Saitama Prefectural Government, and the area is served by NTT East (Nippon Telegraph and Telephone East Corporation) as the primary local exchange carrier.

Dialing Formats and Number Structure

When dialing a number within the 4291 area code from another location in Japan, you must include the area code and the subscriber number. The full national significant number (NSN) is 10 digits, comprising the area code (4 digits) and the subscriber number (6 digits). For example, a local number might be 42-91-XXXX, but when dialed nationally, it becomes 042-91-XXXX. Internationally, callers must dial +81 4291 XXXX, omitting the leading zero from the area code.

For local calls within the same area code, dialing the subscriber number alone may be possible, but it is recommended to always use the full number to avoid confusion, especially with the growing use of VoIP services. The area code 4291 is not an overlay; it is a distinct prefix within the 42 area code, so there are no overlay complications.

Caller Instructions

For callers within Japan: Dial 042-91-XXXX (including the leading zero). For international callers: Dial your country's international access code (e.g., 011 from the US, 00 from most European countries), followed by Japan's country code 81, then the area code without the leading zero (4291), and finally the subscriber number. For example, to call a number 1234-5678 in Hanno, you would dial +81 4291 12345678.

Note that Japan's telephone numbering plan is strictly regulated by the Ministry of Internal Affairs and Communications (MIC), and area codes are assigned based on geographic regions. As of recent years, there have been no plans to change the 4291 area code, ensuring stability for residents and businesses.