Administrative Units
From the National Government perspective, the County is divided into Sub Counties, Divisions, Locations and Sub Locations. The County is headed by the County Commissioner while Sub Counties, Divisions, Locations and Sub Locations are headed by the Deputy County Commissioners, Assistant County Commissioners, Chiefs and Assistant Chiefs respectively.
Figure 2 shows the boundaries of the administrative and political units in Kiambu County.
Table 1: Area (KM2) by Sub County
| Sub County | No of Divisions | No of Locations | No. of Sub-location | Area (Km2) |
| Gatundu North | 2 | 8 | 28 | 285.9 |
| Gatundu South | 3 | 11 | 38 | 193.6 |
| Githunguri | 3 | 6 | 20 | 174.4 |
| Juja | 2 | 10 | 19 | 342.0 |
| Kabete | 2 | 7 | 14 | 60.7 |
| Kiambaa | 2 | 7 | 26 | 91.1 |
| Kiambu | 2 | 9 | 17 | 98.3 |
| Kikuyu | 3 | 8 | 16 | 172.9 |
| Lari | 3 | 4 | 8 | 432.3 |
| Limuru | 2 | 9 | 23 | 158.1 |
| Ndeiya | 1 | 2 | 6 | 127.0 |
| Ruiru | 1 | 1 | 3 | 49.7 |
| Githurai | 1 | 3 | 7 | 151.4 |
| Thika West | 2 | 7 | 14 | 91.4 |
| Thika East | 2 | 4 | 6 | 109.9 |
| Total | 33 | 96 | 245 | 2,538.7 |
| Source: KNBS, 2019 and County Commissioner’s office Kiambu, 2022 | ||||
Kiambu County is subdivided into fifteen (15) Sub Counties with thirty-three (33) Divisions, ninety Six (96) Locations and two hundred and forty five (245) Sub Locations as shown in table 1. The largest Sub County in terms of size is Lari with an area of 432.3 Km2, while the smallest Sub County is Kabete with an area of 60.7 Km2. A large area of land in Lari Sub County is under forest cover.
1.4.2 County Government Administrative Wards by Constituencies
Table 2 shows the County Government Sub Counties, the total area in square kilometer and the number of wards per every sub county.
Table 2: County Government Administrative Wards
| Sub County | Area sq.km | No. of wards |
| Gatundu North | 285.9 | 4 |
| Gatundu South | 193.6 | 4 |
| Githunguri | 174.4 | 5 |
| Juja | 342.0 | 5 |
| Kabete | 60.7 | 5 |
| Kiambaa | 91.1 | 5 |
| Kiambu | 98.3 | 4 |
| Kikuyu | 172.9 | 5 |
| Lari | 432.3 | 5 |
| Limuru | 285.1 | 5 |
| Ruiru | 201.1 | 8 |
| Thika | 201.3 | 5 |
| Total | 2538.7 | 60 |
Source: County Government of Kiambu, 2022
From the County Government Perspective, the County is subdivided into twelve (12) Sub Counties and sixty (60) wards. The wards range from 4 wards to 8 wards per Sub County with Ruiru Sub County having the largest number of wards. Administratively, every Sub County is headed by the Sub County Administrator while every ward is headed by the Ward Administrator.
1.4.3 Political units (Constituencies and Wards)
Kiambu County has twelve constituencies and sixty wards. Table 3 shows the constituencies and electoral wards in the County.
Table 3: County’s Electoral Wards by Constituency
| Constituency | No. of wards | Electoral Wards |
| Gatundu North | 4 | Gituamba, Githobokoni, Chania, Mang’u |
| Gatundu South | 4 | Kiamwangi, Kiganjo, Ndarugo, Ngenda |
| Githunguri | 5 | Githunguri, Githiga, Ikinu, Ngewa, Komothai |
| Juja | 5 | Murera, Theta, Juja, Witeithie, Kalimoni |
| Kabete | 5 | Gitaru, Muguga, Nyathuna, Kabete, Uthiru |
| Kiambaa | 5 | Cianda, Karuri, Ndenderu, Muchatha, Kihara |
| Kiambu | 4 | Ting’ang’a, Ndumberi, Riabai, Township |
| Kikuyu | 5 | Karai, Nachu, Sigona, Kikuyu, Kinoo |
| Lari | 5 | Kinale, Kijabe, Nyanduma, Kamburu, Lari/Kirenga |
| Limuru | 5 | Bibirioni, Limuru Central, Ndeiya, Limuru East, Ngecha/Tigoni |
| Ruiru | 8 | Gitothua, Biashara, Gatongora, Kahawa/Sukari, Kahawa Wendani, Kiuu, Mwiki, Mwihoko |
| Thika Town | 5 | Township, Kamenu, Hospital, Gatuanyaga, Ngoliba |
| Total | 60 |
Source: IEBC
Kiambu County has 12 constituencies with wards ranges from four to eight wards per constituency. Every Constituency has an elected Member of Parliament (MP) who represents the residents in the National Assembly while every ward has an elected Member of County Assembly (MCA) who represents the residents in the County Assembly. The County therefore has 12 elected Members of Assembly and 60 elected Members of County Assembly.
Ruiru Constituency has the highest number of wards (8) while Gatundu North, Gatundu South and Kiambu constituencies have the least with each having 4 wards. Ruiru Constituency is also densely populated thus exerting pressure on the available resources. The County should therefore plan to implement programmes aimed at upgrading the existing infrastructure such as road, housing, water among others in the densely populated areas in order to accommodate the rising population.
