Columns: Code | County | Former Province | Area (km 2 ) | Population Census 2009 | Capital
1 | Mombasa | Coast | 212.5 | 939370 | Mombasa (City) | 2 | Kwale | Coast | 8,270.3 | 649931 | Kwale | 3 | Kilifi | Coast | 12,245.9 | 1109735 | Kilifi | 4 | Tana River | Coast | 35,375.8 | 240075 | Hola | 5 | Lamu | Coast | 6,497.7 | 101539 | Lamu | 6 | Taita-Taveta | Coast | 17,083.9 | 284657 | Voi | 7 | Garissa | North Eastern | 45,720.2 | 623060 | Garissa | 8 | Wajir | North Eastern | 55,840.6 | 661941 | Wajir | 9 | Mandera | North Eastern | 25,797.7 | 1025756 | Mandera | 10 | Marsabit | Eastern | 66,923.1 | 291166 | Marsabit | 11 | Isiolo | Eastern | 25,336.1 | 143294 | Isiolo | 12 | Meru | Eastern | 5,127.1 | 1356301 | Meru | 13 | Tharaka-Nithi | Eastern | 2,409.5 | 365330 | Chuka | 14 | Embu | Eastern | 2,555.9 | 516212 | Embu | 15 | Kitui | Eastern | 24,385.1 | 1012709 | Kitui | 16 | Machakos | Eastern | 5,952.9 | 1098584 | Machakos | 17 | Makueni | Eastern | 8,008.9 | 884527 | Wote | 18 | Nyandarua | Central | 3,107.7 | 596268 | Ol Kalou | 19 | Nyeri | Central | 2,361.0 | 693558 | Nyeri | 20 | Kirinyaga | Central | 1,205.4 | 528054 | Kerugoya / Kutus | 21 | Murang'a | Central | 2,325.8 | 942581 | Murang'a | 22 | Kiambu | Central | 2,449.2 | 1623282 | Kiambu | 23 | Turkana | Rift Valley | 71,597.8 | 855399 | Lodwar | 24 | West Pokot | Rift Valley | 8,418.2 | 512690 | Kapenguria | 25 | Samburu | Rift Valley | 20,182.5 | 223947 | Maralal | 26 | Trans Nzoia | Rift Valley | 2,469.9 | 818757 | Kitale | 27 | Uasin Gishu | Rift Valley | 2,955.3 | 894179 | Eldoret | 28 | Elgeyo-Marakwet | Rift Valley | 3,049.7 | 369998 | Iten | 29 | Nandi | Rift Valley | 2,884.5 | 752965 | Kapsabet | 30 | Baringo | Rift Valley | 11,075.3 | 555561 | Kabarnet | 31 | Laikipia | Rift Valley | 8,696.1 | 399227 | Nanyuki | 32 | Nakuru | Rift Valley | 7,509.5 | 1603325 | Nakuru | 33 | Narok | Rift Valley | 17,921.2 | 850920 | Narok | 34 | Kajiado | Rift Valley | 21,292.7 | 687312 | Kajiado | 35 | Kericho | Rift Valley | 2,454.5 | 752396 | Kericho | 36 | Bomet | Rift Valley | 1,997.9 | 730129 | Bomet | 37 | Kakamega | Western | 3,033.8 | 1660651 | Kakamega | 38 | Vihiga | Western | 531.3 | 554622 | Vihiga | 39 | Bungoma | Western | 2,206.9 | 1375063 | Bungoma | 40 | Busia | Western | 1,628.4 | 743946 | Busia | 41 | Siaya | Nyanza | 2,496.1 | 842304 | Siaya | 42 | Kisumu | Nyanza | 2,009.5 | 968909 | Kisumu | 43 | Homa Bay | Nyanza | 3,154.7 | 963794 | Homa Bay | 44 | Migori | Nyanza | 2,586.4 | 917170 | Migori | 45 | Kisii | Nyanza | 1,317.9 | 1152282 | Kisii | 46 | Nyamira | Nyanza | 912.5 | 598252 | Nyamira | 47 | Nairobi | Nairobi | 694.9 | 3138369 | Nairobi (City)