| name | type | Area (m²) | capital city | Country | continent | population (people) |
|---|---|---|---|---|---|---|
| Baringo County | County | 11,075,299,328 | Kenya | Africa | 555,561 | |
| Bomet County | County | 1,997,900,032 | Kenya | Africa | 730,129 | |
| Bungoma County | County | 2,206,899,968 | Kenya | Africa | 1,375,063 | |
| Busia County | County | 1,628,400,000 | Kenya | Africa | 743,946 | |
| Elgeyo-Marakwet County | County | 3,049,699,840 | Kenya | Africa | 369,998 |