Full List of Kiambu Postal Codes: Everything You Need to Know

Updated 25 October 2026

Kiambu County, which borders Nairobi to the north, has dozens of post offices, and each one has its own five-digit postal code. Thika is 01000, Kiambu Town is 00900, Ruiru is 00232, Kikuyu is 00902 and Limuru is 00217. This guide lists the codes for the county’s main towns and smaller post offices, grouped by area, and explains how to write an address correctly.

What a Kenyan postal code is

The Postal Corporation of Kenya (Posta) describes a postcode as a way of identifying an individual post office by a distinct code. The country is split into postal regions, and offices within each region share a prefix followed by digits that show their place in that region. Posta says the codes reduce the risk of mail being mis-sorted where town names look alike, make room for more private letter boxes and allow automated sorting.

A Kenyan postal address has three parts: the box number, the postal code of the post office where the box is, and the town. For example, P.O. Box 123-00900, Kiambu means box 123 at the Kiambu post office. The code belongs to the post office, not to your house, so use the code of the office where you rent your box even if you live elsewhere.

Main towns in Kiambu and their postal codes

Town	Postal code
Thika	01000
Kiambu Town	00900
Ruiru	00232
Kikuyu	00902
Limuru	00217
Githunguri	00216
Gatundu	01030
Juja (Kalimoni post office)	01001
Karuri	00219
Kijabe	00220

Postal codes by area

Kiambu Town and Kiambaa

Post office	Postal code
Kiambu	00900
Ngewa	00901
Ikinu	00904
Kinari	00227
Ngecha	00218
Karuri	00219
Ndenderu	00230
Kamiti	00607

Thika, Juja and Ruiru

Thika, the county’s biggest industrial town, has several post offices. Juja, home of Jomo Kenyatta University of Agriculture and Technology (JKUAT), is served by the Kalimoni post office. Ruiru has one main office; our separate guide to the Ruiru postal code 00232 covers it in more detail.

Post office	Postal code
Thika	01000
Madaraka (Thika)	01002
Ndithini	01016
Kalimoni (Juja)	01001
Ruiru	00232

Kikuyu, Kabete and Limuru

Post office	Postal code
Kikuyu	00902
Kerwa	00906
Muguga	00228
Wangige	00614
Limuru	00217
Nderu	00229

Lari

Lari lies along the Nairobi to Nakuru highway on the western edge of the county.

Post office	Postal code
Kijabe	00220
Matathia	00221
Kagwe	00223

Githunguri

Post office	Postal code
Githunguri	00216
Gathiru-ini	00239
Gathugu	00240

Gatundu

Post office	Postal code
Gatundu	01030
Gatukuyu	01028
Gituamba	01003
Kanjuku	01004
Kanyoni	01011

These codes come from public postcode directories and have been cross-checked against more than one list. Posta occasionally opens, merges or closes offices, so if a code matters for a legal document, a bank form or an exam registration, confirm it at the counter or with Posta’s customer care before you submit.

When you will need a Kiambu postal code

Postal codes still appear on many forms even though fewer people send letters. You are likely to be asked for one when you:

• open a bank or SACCO account, or apply for a loan;
• register a business name or apply for a KRA PIN;
• fill in job applications and CVs that ask for a postal address;
• receive parcels from abroad through Posta, which handles postal items cleared by customs;
• register for exams or school admissions that ask for a guardian’s address.

If you are importing goods by post, our guide to KRA duty and postal or courier charges on items bought abroad explains what you may pay before collection. Online shoppers can also use Jumia pick-up stations in Kiambu instead of a post box.

How to get a post office box in Kiambu

Boxes are rented at the post office itself, and you choose the office whose code you want on your address. Visit the counter with your national ID (and your business registration papers if the box is for a business), fill in the application, and pay the yearly rental. Posta also offers e-services, and payments made through eCitizen attract a KSh 50 convenience fee according to Posta’s own services page. Rental charges differ for individuals and companies, so ask for the current rate at the counter.

Once your box is active, share the full address with the box number, the code and the town. A letter addressed to “P.O. Box 45, Thika” without the code may still arrive, but adding 01000 cuts the chance of it being sent to the wrong office.

Other county postal codes

If you deal with neighbouring areas, see our list of Nakuru postal codes. Kiambu’s schools are listed in our guide to the best schools in Kiambu County, and the county’s spending plans are covered in our report on the Kiambu County budget. Jobseekers in the county can find current openings on Job in Kenya.

Frequently asked questions

What is the postal code for Kiambu Town?

Kiambu Town’s postal code is 00900. An address there is written as P.O. Box number-00900, Kiambu.

What is the postal code for Thika?

The main Thika post office uses 01000. Madaraka in Thika uses 01002 and Ndithini uses 01016.

What is Juja’s postal code?

Juja is served by the Kalimoni post office, which uses 01001.

What are the postal codes for Ruiru, Kikuyu and Limuru?

Ruiru is 00232, Kikuyu is 00902 and Limuru is 00217.

Does my postal code depend on where I live?

No. The code belongs to the post office where your box is, so use the code of that office even if you live in another town.