Population, Male (persons)
| 2009 |
| Nairobi | 1,605,230 |
| Nakuru | 804,582 |
| Kiambu | 802,609 |
| Kakamega | 800,989 |
| Bungoma | 671,548 |
| Meru | 670,656 |
| Mandera | 559,943 |
| Kisii | 550,464 |
| Machakos | 543,139 |
| Kilifi | 535,526 |
| Mombasa | 486,924 |
| Kitui | 481,282 |
| Kisumu | 474,760 |
| Homa Bay | 462,454 |
| Muranga | 457,864 |
| Uasin Gishu | 448,994 |
| Turkana | 445,069 |
| Migori | 444,356 |
| Makueni | 430,710 |
| Narok | 429,026 |
| Trans Nzoia | 407,172 |
| Siaya | 398,652 |
| Kericho | 381,980 |
| Nandi | 376,488 |
| Wajir | 363,766 |
| Bomet | 359,727 |
| Busia | 356,122 |
| Kajiado | 345,146 |
| Nyeri | 339,725 |
| Garissa | 334,939 |
| Kwale | 315,997 |
| Nyandarua | 292,155 |
| Nyamira | 287,048 |
| Baringo | 279,081 |
| Vihiga | 262,716 |
| Kirinyaga | 260,630 |
| West Pokot | 254,827 |
| Embu | 254,303 |
| Laikipia | 198,625 |
| Elgeyo Marakwet | 183,738 |
| Tharaka Nithi | 178,451 |
| Marsabit | 151,112 |
| Taita Taveta | 145,334 |
| Tana River | 119,853 |
| Samburu | 112,007 |
| Isiolo | 73,694 |
| Lamu | 53,045 |