| Region | Kibaki | % | Kenyatta | % | Nyachae | % | Orengo | % | Ng’ethe | % |
| Central | 701,916 | 68.9 | 308,012 | 30.2 | 4441 | 0.4 | 1443 | 0.1 | 2053 | 0.2 |
| Coast | 228,915 | 62.7 | 121,645 | 33.4 | 11,716 | 3.2 | 1539 | 0.4 | 823 | 0.2 |
| Eastern | 749,654 | 72.5 | 270,225 | 26.1 | 7863 | 0.8 | 3509 | 0.3 | 2216 | 0.2 |
| Nairobi | 279,705 | 76.4 | 76,001 | 20.8 | 8775 | 2.4 | 891 | 0.2 | 301 | 0.1 |
| North Eastern | 34,916 | 28.1 | 83,358 | 67.1 | 5660 | 4.6 | 297 | 0.2 | 73 | 0.1 |
| Nyanza | 521,052 | 61.3 | 64,471 | 7.6 | 252,448 | 29.7 | 9620 | 1.1 | 1115 | 0.1 |
| Rift Valley | 624,501 | 43.2 | 769,242 | 53.3 | 45,145 | 3.1 | 3826 | 0.3 | 1624 | 0.1 |
| Western | 506,999 | 76.3 | 143,101 | 21.5 | 9073 | 1.4 | 3443 | 0.5 | 1825 | 0.3 |
| Total | 3,647,658 | 61.3 | 1,836,055 | 30.2 | 345,161 | 5.9 | 24,568 | 0.4 | 10,030 | 0.1 |