The following list contains the top 10 largest counties in Kenya by size. Turkana County is the largest by area (71,597.8 km²) while Mombasa is the smallest (212.5km²).
Top 10 Largest Counties in Kenya by Size
| County | Area (km2) | |
| 1. | Turkana | 71,597.8 |
| 2. | Marsabit | 66,923.1 |
| 3. | Wajir | 55,840.6 |
| 4. | Garissa | 45,720.2 |
| 5. | Tana River | 35,375.8 |
| 6. | Mandera | 25,797.7 |
| 7. | Isiolo | 25,336.1 |
| 8. | Kitui | 24,385.1 |
| 9. | Kajiado | 21,292.7 |
| 10. | Samburu | 20,182.5 |
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