Area Code 4287 – Ome, Tokyo

Overview of Area Code 4287

Area code 4287 is a geographic numbering allocation within the Japanese telephone numbering plan, specifically designated for the Ome area in the western portion of Tokyo Metropolis. This code is part of the larger 0428 area code group, which serves the Tama region, including the cities of Ome, Fussa, Hamura, and Akiruno. The 0428 area code is one of several geographic codes assigned to the western suburbs of Tokyo, distinct from the 03 code used for central Tokyo's 23 wards.

Geographic Coverage and Administrative Jurisdiction

The 4287 prefix is assigned to the city of Ome, a municipality located approximately 40 kilometers west of central Tokyo. Ome is known for its scenic mountainous terrain, the Tama River, and the historic Ome Railway. Administratively, Ome is part of Tokyo Metropolis, which extends beyond the 23 special wards to include numerous cities, towns, and villages in the western Tama area. The 0428 area code covers a significant portion of this western region, with 4287 specifically routing to landline numbers within Ome's central and surrounding districts.

Dialing Formats and Instructions

For callers within Japan, dialing a number in the Ome area requires the trunk prefix 0 followed by the area code 4287 and the subscriber number. For example, a local Ome number might be formatted as 0428-87-XXXX. When calling from outside Japan, the international format is +81 4287 87 XXXX, where the leading 0 is dropped. It is important to note that the area code 4287 is used for landline (fixed-line) services, and the subscriber number typically consists of four digits, making the complete national significant number 10 digits (including the leading 0).

Overlay and Numbering Considerations

As of the latest numbering plan updates, the 0428 area code does not have an overlay code; it remains a standalone geographic code. However, with the increasing adoption of VoIP and IP-based services, some numbers within the 0428 range may be assigned to non-geographic services, but the 4287 prefix is traditionally associated with physical landlines in Ome. Callers should be aware that when dialing from mobile phones or VoIP services within Japan, the same dialing rules apply, but charges may vary depending on the caller's plan.

Practical Guidance for Callers

For local callers within the 0428 area, dialing the subscriber number alone (without the area code) may suffice for calls within the same area code, but it is always safer to include the full number to avoid misrouting. For international callers, the country code +81, followed by 4287 and the subscriber number, ensures proper routing. For example, to call a business in Ome with the number 87-1234, you would dial +81 4287 87 1234 from abroad. Always confirm the subscriber number length, as some numbers may have additional digits depending on the service provider.