Kiambu constituency has 4 wards as follows: Ting'ang'a Ward Ndumberi Ward Riabai Ward Township Ward

Githunguri constituency has 5 wards as follows: Githunguri Ward Githiga Ward Ikinu Ward Ngewa Ward Komothai Ward

With 8 wards, Ruiru constituency has the largest number of wards in Kiambu County. They are: Gitothua Ward Biashara Ward Gatongora Ward Kahawa/Sukari Ward Kahawa Wendani Ward Kiuu Ward Mwiki Ward Mwihoko Ward

Thika Town constituency has 5 wards as follows: Township Ward Kamenu Ward Hospital Ward Gatuanyaga Ward Ngoliba Ward

Juja constituency has 5 wards as follows: Murera Ward Theta Ward Juja Ward Witeithie Ward Kalimoni Ward

Gatundu North constituency has 4 wards as follows: Gituamba Ward Githobokoni Ward Chania Ward Mang'u Ward