Area Code 4288 – Ome, Tokyo

Geographic Overview

The area code 4288 is a geographic National Destination Code (NDC) within the Japanese numbering plan, specifically assigned to the Ome region in western Tokyo Metropolis. Ome is a city located approximately 40 kilometers west of central Tokyo, nestled in the Tama Hills along the Tama River. The code covers Ome City and its surrounding areas, including parts of Akiruno, Hinode, and Okutama towns. This region is known for its scenic mountains, the Chichibu-Tama-Kai National Park, and the historic Ome Railway Park.

Dialing Formats

When calling a landline in Ome from within Japan, the national trunk prefix 0 is dialed, followed by the area code 4288 and the subscriber number. For example, a local number might be 0-4288-XXXXXX. However, note that the actual subscriber number length can vary, but the total number of digits after the trunk prefix is typically 10 (including the area code).

For international callers, the format is +81 4288 XXXXXX, where +81 is the country code for Japan, and the leading 0 of the area code is omitted. For instance, if the local number is 0-4288-123456, the international format would be +81 4288 123456.

Administrative and Regulatory Notes

The 4288 area code is part of the Tokyo Metropolis numbering plan, which is administered by the Ministry of Internal Affairs and Communications (MIC) in Japan. It is a geographic code, meaning that calls are routed based on the physical location of the line. The code is not portable outside its geographic area, and number portability is limited to within the same service area.

Ome is served by NTT East, the regional incumbent carrier, but alternative carriers and VoIP services also operate in the area. For local calls within the Ome area, dialing the area code is often unnecessary if the caller and receiver are in the same charging group, but for clarity and to avoid misdialing, it is recommended to include the area code.

Caller Instructions

• Local callers (within Ome): Dial the subscriber number directly (without the area code) if the call is within the same local area. However, to ensure proper routing, many users dial the full number including the area code.
• Domestic callers from other parts of Japan: Dial 0-4288-XXXXXX.
• International callers: Dial your country's exit code, then 81 4288 XXXXXX (omit the leading 0).

This area code is not an overlay; it is the sole geographic code for Ome. However, neighboring areas may have different codes, such as 428 (Hachioji) or 429 (Fussa), so callers should verify the correct code when calling nearby towns.