Kiambu is a county in Kenya designated Code 022. Like all Counties in Kenya, it was formed with the introduction of developed government systems after the 2013 general elections under the new 2010 Kenyan Constitution. In addition, Kiambu County has Postal codes that power its growing logistics networks, digital services, and governance frameworks.
As of 2025, the Postal Corporation of Kenya continues to manage all the postal codes for Kiambu County, which now has over 2.4 Million Residents. Kiambu County borders Nairobi and Kajiado counties to the south, Nakuru to the west, Muranga to the north, Machakos to the east, and Nyandarua to the northwest.
Kiambu County’s Administrative Structure
As guided by the Kenyan Constitution, Kiambu County is divided into sub-counties, divisions, locations, and sub-locations, the primary purpose of which is to bring the services of the county government closer to the county’s residents. The Kiambu County has fifteen sub-counties with thirty-three Divisions, ninety-six Locations, and two hundred and forty-five sub-locations as shown in the table below:
| 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 |
What is the postal Code for Kiambu County?
Kiambu County has several regions, each with its own Unique Postal codes. However, the Whole of the Kiambu Postal Code in General is 00900, which identifies the Kiambu General Post Office (GPO) in Kiambu Town. Kiambu County Postal codes also use the 5-digit system managed by the Postal Corporation of Kenya, where each digit has significance in ensuring the accuracy of sorting and delivery of mail.
Kiambu does not use ZIP codes, a system primarily associated with the United States. Instead, all addresses combine postal codes with PO Box numbers. The Official Postal address for Kimabu county is P.O. Box 2344-00900, Kiambu.
Kiambu Postal Codes by Sub-County
Kiambu’s Main postal code is 00900, but the county is structured into Sub-counties with wards and towns with various Postal codes. All the Postal codes from Kiambu Sub-counties are as follows:
| No. | Sub-County | Postal Code Range |
|---|---|---|
| 1 | Gatundu North | 01030–01039 |
| 2 | Gatundu South | 01028–01034 |
| 3 | Githunguri | 00216–00240 |
| 4 | Juja | 01001–01016 |
| 5 | Kabete | 00604–00614 |
| 6 | Kiambaa | 00228–00230, 00900–00904 |
| 7 | Kiambu | 00900–00907 |
| 8 | Kikuyu | 00902–00906 |
| 9 | Lari | 00220–00223 |
| 10 | Limuru | 00217–00229 |
| 11 | Ruiru | 00232–00239 |
| 12 | Thika East | 01000–01016 |
| 13 | Thika West | 01017–01025 |
Kiambu County Postal Codes FAQ
What is the PO Box for Kiambu County?
The official PO Box address for the Kiambu County headquarters is P.O. Box 2344-00900, Kiambu.
What is Thika’s postal code?
Thika uses the central postal code 01000, which applies to its main post office and surrounding areas.
What is the Ruiru postal code?
Ruiru’s primary postal code is 00232, used for its industrial zones, residential estates (e.g., Tatu City), and the main post office.
What is the postal code of Kikuyu?
Kikuyu Town’s main postal code is 00902, covering its central business district.