Siaya Postal Codes, Kenya

Postal codes for Siaya range from 40142 to 40637 in Kenya. To find exact ZIP codes and postcodes within Siaya, choose from the constituencies listed below.

Constituencies in Siaya

Siaya on the Map

The map above highlights the geographic boundaries of the Siaya county in Kenya. The postal codes listed on this page correspond to specific towns, villages, and post offices within this area.

What to Know About Siaya

Key Facts

Siaya is a county located in western Kenya, situated along the northeastern shores of Lake Victoria. Positioned within the former Nyanza Province, Siaya County borders Busia County to the north, Kakamega County to the northeast, Vihiga County to the east, and Kisumu County to the southeast, while its western boundary is defined by the expansive waters of Lake Victoria. With an approximate population of 993,000 people as of the 2019 census, Siaya covers a land area of approximately 2,530 square kilometers, making it one of the smaller counties in Kenya by size but with significant population density. The county is administratively divided into six sub-counties: Alego Usonga, Bondo, Gem, Rarieda, Ugenya, and Ugunja, each containing multiple wards and villages that form the local governance structure. Siaya serves as an important agricultural and fishing hub for the region, with its economy heavily dependent on subsistence farming, fishing in Lake Victoria, and small-scale trade. This county provides access to comprehensive postal code information for all its constituent sub-regions and localities.

Neighboring Regions

* Busia County

* Kakamega County

* Vihiga County

* Kisumu County