Urban Population (persons)
| 2009 |
| Nairobi | 3,138,369 |
| Kiambu | 1,017,476 |
| Mombasa | 939,370 |
| Nakuru | 735,025 |
| Machakos | 571,355 |
| Kisumu | 507,720 |
| Uasin Gishu | 345,559 |
| Migori | 311,512 |
| Bungoma | 298,696 |
| Kilifi | 285,482 |
| Kajiado | 284,862 |
| Kisii | 271,719 |
| Kakamega | 252,611 |
| Kericho | 228,318 |
| Meru | 190,497 |
| Mandera | 185,568 |
| Vihiga | 174,105 |
| Nyeri | 169,617 |
| Trans Nzoia | 167,420 |
| Garissa | 146,668 |
| Muranga | 145,202 |
| Kitui | 139,909 |
| Homa Bay | 138,051 |
| Bomet | 132,255 |
| Busia | 122,190 |
| Turkana | 121,719 |
| Kwale | 117,676 |
| Nyandarua | 110,518 |
| Makueni | 104,297 |
| Nandi | 102,281 |
| Laikipia | 99,117 |
| Wajir | 96,855 |
| Siaya | 90,627 |
| Kirinyaga | 83,404 |
| Embu | 82,921 |
| Nyamira | 68,303 |
| Taita Taveta | 64,289 |
| Marsabit | 64,009 |
| Isiolo | 62,374 |
| Baringo | 61,551 |
| Narok | 58,494 |
| Elgeyo Marakwet | 53,186 |
| West Pokot | 42,696 |
| Samburu | 38,664 |
| Tana River | 36,065 |
| Lamu | 20,238 |
| Tharaka Nithi | 8,535 |