Area Code 4282 – Ome, Tokyo

Geographic Coverage and Administrative Jurisdiction

The area code 0428 is a geographic National Destination Code (NDC) within the Japanese numbering plan, allocated to the western region of the Tokyo Metropolis. Specifically, it serves the city of Ome (青梅市) and its surrounding areas, including the cities of Hamura, Fussa, and Akiruno, as well as the towns of Mizuho and Okutama. This region is part of the Tama area, a suburban and mountainous zone west of central Tokyo. The administrative jurisdiction falls under the Tokyo Metropolitan Government, but the area is distinctly separate from the 03 code used for central Tokyo's 23 special wards.

Dialing Formats and Caller Instructions

When dialing a local number within the 0428 area, the full NDC plus the subscriber number must be dialed, even for calls within the same city. For example, a local call to a business in Ome would be dialed as 0428-2X-XXXX. For callers from other parts of Japan, the international format is not required; simply dial 0428-2X-XXXX from any domestic phone. However, for callers from outside Japan, the country code +81 must be used, and the leading zero of the NDC is dropped. Thus, an international caller would dial +81 428-2X-XXXX.

Numbering Structure and Overlay Considerations

Subscriber numbers in the 0428 area are typically seven digits long, but the first digit after the area code is often '2' or '3', reflecting the historical allocation of central office codes. The total number length is 10 digits when including the leading zero of the NDC. There are no overlay codes in this region; 0428 is the sole geographic code for the area. However, it is important to note that the adjacent area codes 042 and 0429 serve neighboring regions, and callers must be careful to dial the correct code to avoid misrouting.

Telecom Infrastructure and Services

The 0428 area is served by NTT East, the regional incumbent carrier, and various alternative carriers. Both fixed-line PSTN and VoIP services are available, with VoIP numbers often using the same geographic code to appear local. Mobile numbers in Japan do not use geographic codes; they are non-geographic and begin with 070, 080, or 090. Therefore, when calling a mobile phone in Ome, you would dial the mobile number directly without the 0428 prefix. For emergency services, dial 110 (police) or 119 (fire/ambulance), which are reachable from any phone without an area code.

Practical Examples for Callers

• Local call (within Ome): 0428-2X-XXXX
• Domestic call from Tokyo (03 area): 0428-2X-XXXX
• International call from the US: 011 81 428-2X-XXXX
• International call from the UK: 00 81 428-2X-XXXX

When dialing from a mobile phone in Japan, the same domestic format applies. Always ensure you have the correct area code, as omitting it will result in a failed call.