| 2009 | |
|---|---|
| Nairobi (City) | 230 704 |
| Kiambu | 60 224 |
| Nakuru | 32 572 |
| Mombasa | 31 055 |
| Meru | 29 737 |
| Nyeri | 24 534 |
| Kajiado | 15 602 |
| Uasin Gishu | 15 465 |
| Kericho | 15 249 |
| Kilifi | 14 151 |
| Embu | 11 810 |
| Kirinyaga | 10 975 |
| Muranga | 10 802 |
| Machakos | 9 809 |
| Laikipia | 8 753 |
| Bomet | 7 910 |
| Kisumu | 7 653 |
| Kakamega | 6 263 |
| Nyandarua | 5 718 |
| Taita Taveta | 4 639 |
| Makueni | 4 529 |
| Bungoma | 4 186 |
| Nandi | 3 234 |
| Garissa | 3 233 |
| Kwale | 3 080 |
| Trans Nzoia | 2 822 |
| Kisii | 2 449 |
| Turkana | 2 313 |
| Isiolo | 2 010 |
| Kitui | 1 968 |
| Baringo | 1 925 |
| Elgeyo Marakwet | 1 856 |
| Siaya | 1 850 |
| Lamu | 1 732 |
| Homa Bay | 1 625 |
| Mandera | 1 426 |
| Narok | 1 401 |
| Vihiga | 1 387 |
| Migori | 1 359 |
| West Pokot | 1 210 |
| Busia | 986 |
| Tana River | 800 |
| Nyamira | 713 |
| Samburu | 441 |
| Tharaka Nithi | 328 |
| Wajir | 249 |
| Marsabit | 147 |