Area Code 4 – Kasai-Oriental/Kasai-Occidental

Overview of Area Code +243 4

The country calling code +243 is assigned to the Democratic Republic of the Congo (DRC) under ITU-T E.164. Within this national numbering plan, the trunk prefix '4' designates a geographic area code serving the historic Kasai region, which currently comprises the provinces of Kasai-Oriental (including the major city of Mbuji-Mayi) and Kasai-Occidental (including Kananga). These provinces are located in the south-central part of the country. The area code is used for fixed-line (PSTN) services, and numbers under this prefix are allocated to local exchanges within these administrative regions.

Geographic Coverage and Major Cities

The +243 4 area code covers a large, landlocked territory known for diamond mining and agriculture. Key cities and towns served by this code include:

• Mbuji-Mayi – the capital of Kasai-Oriental and the largest city in the region, a major commercial hub.
• Kananga – the capital of Kasai-Central (formerly part of Kasai-Occidental), historically the second-largest city in the area.
• Tshikapa – a city in Kasai province, also within the historic Kasai-Occidental.
• Mwene-Ditu – a city in Lomami province, which was also part of the former Kasai-Oriental.

Note that due to the 2015 administrative reorganization, the former Kasai-Oriental and Kasai-Occidental provinces were split into several new provinces (Kasai, Kasai-Central, Kasai-Oriental, Lomami, and Sankuru). However, the area code '4' remains in use across these territories, and no overlay or split of the numbering area has been implemented.

Dialing Formats

To call a fixed-line number in the Kasai region from abroad, you must dial the international access prefix (00 or +), followed by the country code 243, then the area code 4 (without the leading trunk prefix '0' that is used domestically), and finally the local subscriber number. For example, a local number in Mbuji-Mayi might be formatted as:

• International format: +243 4 XXX XXXX (or +2434XXXXXXX)
• Domestic format (within DRC): 04 XXX XXXX (when dialing from another region in the DRC, you must include the trunk prefix '0' before the area code).

If you are calling from within the same local area, you may only need to dial the local subscriber number, but this depends on the specific local dialing plan. For international callers, always replace the leading '0' with the country code and drop the trunk prefix.

Practical Guidance for Callers

When placing a call to a number with the +243 4 prefix, ensure you have the correct number of digits. DRC fixed-line numbers typically consist of 7 to 8 digits after the area code, but the exact length may vary. If you are unsure, confirm the number with the recipient. For local callers within the DRC, note that mobile numbers (which start with 8 or 9) are not part of this geographic code. For international callers, be aware that call charges to the DRC may be higher than average, and you should check with your service provider for rates. Also, due to network infrastructure challenges, call quality can sometimes be inconsistent, but VoIP services are increasingly used to mitigate this.