Busia is a county in the former Western Province of Kenya. It is located directly east of the border town of Busia, Uganda, and borders Lake Victoria to the southwest, Siaya County to the southeast, and Bungoma County and Kakamega County to the east. The county is composed of six sub-counties, and had a population of 893,681 as of the most recent …Busia is a county in the former Western Province of Kenya. It is located directly east of the border town of Busia, Uganda, and borders Lake Victoria to the southwest, Siaya County to the southeast, and Bungoma County and Kakamega County to the east. The county is composed of six sub-counties, and had a population of 893,681 as of the most recent census in 2019.