Number of Households (number)
| 2009 |
| Nairobi | 985,016 |
| Kiambu | 482,450 |
| Nakuru | 409,836 |
| Meru | 381,026 |
| Kakamega | 355,679 |
| Bungoma | 270,824 |
| Kisii | 269,683 |
| Mombasa | 268,700 |
| Machakos | 264,500 |
| Muranga | 242,490 |
| Kisumu | 226,719 |
| Homa Bay | 206,255 |
| Kitui | 205,491 |
| Uasin Gishu | 202,291 |
| Nyeri | 201,703 |
| Kilifi | 199,764 |
| Siaya | 199,034 |
| Makueni | 186,478 |
| Migori | 180,211 |
| Bomet | 174,914 |
| Kajiado | 173,464 |
| Trans Nzoia | 170,117 |
| Narok | 169,220 |
| Busia | 154,225 |
| Kirinyaga | 154,220 |
| Nandi | 154,073 |
| Nyandarua | 143,879 |
| Embu | 131,683 |
| Kericho | 127,581 |
| Mandera | 125,497 |
| Vihiga | 123,347 |
| Turkana | 123,191 |
| Kwale | 122,047 |
| Baringo | 110,649 |
| Nyamira | 106,385 |
| Laikipia | 103,114 |
| Garissa | 98,590 |
| West Pokot | 93,777 |
| Wajir | 88,574 |
| Elgeyo Marakwet | 77,555 |
| Taita Taveta | 71,090 |
| Marsabit | 56,941 |
| Tana River | 47,414 |
| Samburu | 47,354 |
| Isiolo | 31,326 |
| Tharaka Nithi | 27,393 |
| Lamu | 22,184 |