Area Code 58 – Kisii/Kilgoris/Oyugis/Nyamira

Overview of Area Code +254 58

Area code 58 is a geographic National Destination Code (NDC) within the Kenyan numbering plan, assigned to the southwestern region of the country. It covers the counties of Kisii, Nyamira, and parts of Narok (specifically the Kilgoris area), as well as the town of Oyugis in Homa Bay County. This region is part of the former Nyanza Province and is characterized by a mix of urban centers and agricultural hinterlands.

Coverage and Major Towns

The code serves a population concentrated in the Kisii Highlands, one of the most densely populated rural areas in Kenya. Key towns and administrative centers within this NDC include:

• Kisii – the largest town and county headquarters, a commercial hub for the region.
• Nyamira – county headquarters of Nyamira County, located to the east of Kisii.
• Kilgoris – a growing town in Narok County, serving the Maasai Mara ecosystem and surrounding areas.
• Oyugis – a key market town in Homa Bay County, near the shores of Lake Victoria.

These towns are interconnected by road networks and are served by both fixed-line and mobile telephony services, though fixed-line penetration is relatively low compared to mobile.

Dialing Formats

For callers within Kenya, the area code is dialed as part of the full national number. The national significant number (NSN) for geographic numbers in Kenya is 9 digits, beginning with the NDC. For area code 58, the local number is 7 digits long, making the complete national number 058XXXXXXX (when dialed from within Kenya, the leading zero is included).

For international callers, the number is dialed as +254 58 XXXXXXX, where the leading zero of the NDC is dropped. For example, a local Kisii number might be +254 58 1234567.

Caller Instructions

• Local callers within Kenya (outside the 58 area) must dial 058 followed by the 7-digit subscriber number.
• Callers within the same area may sometimes use 7-digit local dialing, but for consistency and due to mobile integration, it is recommended to always use the full national format.
• International callers should dial their country's exit code (e.g., 00 or +) followed by 254, then 58, and the 7-digit number.

Overlays and Numbering Considerations

Kenya has not implemented overlay area codes for geographic numbers; each geographic region has a unique NDC. However, mobile numbers are non-geographic and use prefixes like 07, 01, etc., and are not affected by this area code. Fixed-line numbers in this region are relatively scarce, and many businesses and households rely on mobile or VoIP services.

As of the latest ITU-T E.164 guidelines, the Kenyan numbering plan is administered by the Communications Authority of Kenya (CA). The 58 NDC is part of the national numbering scheme and is not subject to portability between geographic areas; number portability applies mainly to mobile services.