Area Code 4283 – Ome, Tokyo

Overview of Area Code 4283

Area code 4283 is a geographic numbering plan area within the Japanese telephone numbering system, specifically serving the city of Ome (青梅市) and its surrounding areas in the western portion of the Tokyo Metropolis. This code is part of the larger 0428 area code group, which covers the western Tama region of Tokyo, including cities such as Akiruno, Hinode, and Okutama. The 4283 prefix is assigned to fixed-line (PSTN) services, including traditional analog lines, ISDN, and fiber-optic (FTTH) based voice services provided by NTT East and other licensed carriers.

Geographic Coverage and Jurisdiction

Ome is a city located approximately 40 to 60 kilometers west of central Tokyo, nestled in the valley of the Tama River. It serves as a commercial and administrative hub for the westernmost part of the Tokyo Metropolis, bordering Saitama Prefecture to the north and Yamanashi Prefecture to the west. The 4283 prefix covers the central and eastern districts of Ome, including areas around JR Ome Station, Mitake, and the industrial zones along the Tama River. 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 wards.

Dialing Formats and Procedures

Local Dialing (within Ome and the 0428 area): When calling a number within the same 0428 area, callers can typically omit the area code and dial just the 7-digit subscriber number. For example, a local call to a number in Ome would be dialed as 83-XXXX (where XXXX is the four-digit subscriber number). However, due to the expansion of the numbering plan, some areas may require the full 10-digit dialing even for local calls. It is always safe to dial the full number.

National Dialing (from other parts of Japan): Callers from outside the 0428 area must dial the trunk prefix 0, followed by the area code 4283, and then the subscriber number. For example, to call a business in Ome from Tokyo's 03 area, you would dial: 0-4283-XX-XXXX. Note that the area code is 4283, not 04283; the leading 0 is the national trunk prefix and is not part of the area code itself.

International Dialing (from outside Japan): To call an Ome number from abroad, you need to 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, and then the area code without the leading 0. Thus, the international format becomes: +81-4283-XX-XXXX. For instance, a full international number might appear as +81 4283 45 6789.

Overlay and Numbering Considerations

Currently, there is no overlay code for the 0428 area; the area code 0428 is unique to this region. However, the Japanese government has been considering number conservation measures, and future overlays are possible. Subscriber numbers in the 4283 prefix are typically 4 digits long, making the total national significant number (NSN) 10 digits (including the area code). It is important to note that the 4283 prefix is not used for mobile services; mobile numbers in Japan always begin with 070, 080, or 090. VoIP services may also be assigned numbers with the 0428 area code, but they are location-independent and can be used anywhere with a broadband connection.

Caller Instructions

For local callers: If you are within the 0428 area, you may dial the 7-digit number directly. However, to avoid confusion, it is recommended to dial the full 10-digit number (0-4283-XXXX). For callers from other parts of Japan: Always dial 0-4283-XXXX. For international callers: Dial your exit code, then 81-4283-XXXX. Remember that the leading '0' is not included when dialing from abroad.