Quick Answer: The postal code most commonly used for the United Nations complex in Nairobi is 00100 (GPO) for P.O. Box mail, as most UN agencies register their postal boxes at the General Post Office. However, the UN complex is physically located in the Gigiri area, which falls under postal codes 00601 (Gigiri Post Office) and 00621 (Village Market Post Office).
About the United Nations in Nairobi
Nairobi holds a unique and prestigious distinction in the world of international diplomacy: it is home to the United Nations Office at Nairobi (UNON), the only UN headquarters located in Africa and in the entire Global South. This makes Nairobi one of only four cities in the world, alongside New York, Geneva, and Vienna, to host a major UN headquarters facility.
The UN complex is situated in the Gigiri neighborhood of Nairobi, along the aptly named United Nations Avenue, adjacent to the lush Karura Forest. The compound is a sprawling, high-security campus that houses over 40 UN entities and more than 70 offices, making it one of the largest and most institutionally complex UN presences anywhere in the world. Major agencies headquartered here include UNON itself, the United Nations Environment Program (UNEP), and the United Nations Human Settlements Program (UN-Habitat).
The UN Nairobi Postal Code
One of the most common points of confusion when trying to find the postal code for UN Nairobi is that there are effectively two postal codes in use, each serving a different purpose.
Most UN agencies in Nairobi maintain their official P.O. Boxes at the General Post Office (GPO) in the Central Business District. This means their registered postal code is 00100, the GPO code. When you see an address like P.O. Box 30552-00100, Nairobi for UNEP, the 00100 refers to the GPO, not Gigiri. Mail is collected from those P.O. Boxes at the GPO and transported to the Gigiri campus.
On the other hand, the physical street address of the UN campus, United Nations Avenue, Gigiri, sits within a postal zone served by either the Gigiri Post Office (00601) or the Village Market Post Office (00621), depending on the exact block or building. For courier deliveries via DHL, G4S, or Fargo, use the physical address with the nearest postal code: 00621 for the Village Market area or 00601 for the Gigiri Post Office zone.
All UN Agencies in Nairobi, Their P.O. Box Numbers & Postal Codes
The table below provides the official postal details for the major United Nations agencies and bodies based at the Gigiri complex in Nairobi.
| UN Agency / Body | P.O. Box | Postal Code | Location / Block | Phone |
|---|---|---|---|---|
| UNON – UN Office at Nairobi | P.O. Box 67578 | 00200 | UN Avenue, Gigiri | +254 20 762 0000 |
| UNEP – UN Environment Programme | P.O. Box 30552 | 00100 | UN Avenue, Gigiri | +254 20 762 1234 |
| UN-Habitat – Human Settlements Programme | P.O. Box 30030 | 00100 | UN Complex, Gigiri | +254 20 762 3120 |
| UNDP Kenya – Development Programme | P.O. Box 30218 | 00100 | Block M, Ground Floor, Gigiri | +254 20 762 5991 |
| UNICEF Kenya – Children’s Fund | P.O. Box 44145 | 00100 | UN Complex, Gigiri | +254 20 762 2500 |
| FAO Kenya – Food & Agriculture Organisation | P.O. Box 30470 | 00100 | Block P, Level 3, Gigiri | +254 20 762 5920 |
| UNESCO – Regional Office Eastern Africa | P.O. Box 30592 | 00100 | UNON, Gigiri | +254 20 762 1234 |
| OCHA – Office for Coordination of Humanitarian Affairs | P.O. Box 41609 | 00100 | Block N, Ground Floor, Gigiri | +254 20 762 4363 |
| UNOPS Kenya | P.O. Box 47074 | 00100 | Block N, Level 2, Gigiri | – |
| UNIS Nairobi – UN Information Service | P.O. Box 67578 | 00200 | UN Avenue, Gigiri | +254 20 762 3798 |
| Visitors Service / UN Tours | P.O. Box 67578 | 00200 | UN Avenue, Gigiri | +254 742 983 832 |
| WFP – World Food Programme | P.O. Box 44482 | 00100 | UN Complex, Gigiri | +254 20 762 4600 |
How to Address Mail and Courier Deliveries to UN Nairobi
Whether you are sending a job application, an official document, or a parcel to any UN agency in Nairobi, the format of your address matters. Using the wrong format can result in your mail being delayed, misrouted, or returned. Below are the three correct formats to use depending on your specific situation.
Format 1: Official P.O. Box Mail (Letters, Documents, Applications)
Use this format when sending formal mail, job application letters, or official documents through Posta Kenya or any postal service. This is the standard format recognised by all UN agencies in Nairobi:
[Recipient Name / Department] [UN Agency Name] P.O. Box [Agency Box Number]-00100 Nairobi, Kenya
Example for UNEP:
Human Resources Department United Nations Environment Programme (UNEP) P.O. Box 30552-00100 Nairobi, Kenya
Example for UNON:
Division of Conference Services United Nations Office at Nairobi (UNON) P.O. Box 67578-00200 Nairobi, Kenya
Format 2: International Mail (Sending from Outside Kenya)
When mailing from another country, always include the country name on the last line. This helps international postal systems route your item correctly to Kenya:
[Recipient Name / Department] [UN Agency Full Name] P.O. Box [Agency Box Number]-00100 Nairobi KENYA
Format 3: Courier / Physical Delivery (DHL, G4S, Fargo, Wells Fargo)
For physical deliveries such as parcels, diplomatic bags, or packages via courier services, you must use the physical street address. P.O. Box addresses cannot receive courier parcels. Always include the recipient’s phone number as couriers will call ahead for gate clearance at the UN complex:
[Recipient Name] [UN Agency] - [Block / Floor / Office] United Nations Avenue, Gigiri 00621 Nairobi Kenya Phone: +254 [recipient mobile number] Landmark: UN Complex Gigiri, opposite US Embassy
Common mistakes to avoid when addressing UN Nairobi: Do not write “ZIP: 00100” — Kenya does not use ZIP codes. Do not use just “Nairobi, Kenya” without a postal code, as this slows sorting. Never write “00000” or leave the postal code field blank when filling out online forms. Always use the specific agency’s P.O. Box number rather than a generic UN address.
Frequently Asked Questions (FAQ)
What is the postal code for UN Nairobi?
The most widely used postal code for UN Nairobi is 00100, which is the General Post Office (GPO) code used by most UN agencies for their official P.O. Box mail. These include UNEP, UN-Habitat, UNDP, UNICEF, FAO, UNESCO, and OCHA. However, UNON and several of its departments officially use 00200 (City Square). For physical courier deliveries to the Gigiri campus, use 00621 (Village Market Post Office) or 00601 (Gigiri Post Office).
What is UNEP’s official postal address in Nairobi?
UNEP’s official postal address is: P.O. Box 30552-00100, United Nations Avenue, Gigiri, Nairobi, Kenya. For general enquiries you can email unepinfo@unep.org or call +254 20 762 1234. For courier deliveries, address to the physical campus: United Nations Avenue, Gigiri, 00621 Nairobi, Kenya.
What is UNON’s postal code?
UNON — the United Nations Office at Nairobi — officially uses postal code 00200. Its full mailing address is: P.O. Box 67578-00200, UN Avenue, Gigiri, Nairobi, Kenya. You can reach the main switchboard on +254 20 762 0000. Note that this is different from the 00100 code used by other UN agencies based at the same Gigiri complex.
What is the difference between postal codes 00100 and 00601 for UN Nairobi?
00100 is the code for the General Post Office (GPO) located in the CBD on Haile Selassie Avenue. Most UN agencies hold their registered P.O. Boxes here, so their mailing addresses carry the 00100 code even though they are physically located in Gigiri. 00601 is the code for the Gigiri Post Office on Limuru Road, which is the post office that serves the physical Gigiri neighbourhood. For letter mail, use 00100 (or 00200 for UNON). For street-level and courier deliveries, use 00601 or 00621.
What is the physical street address of the UN complex in Gigiri?
The physical address of the UN Gigiri complex is: United Nations Avenue, Gigiri, Nairobi, Kenya. The recommended postal code for courier deliveries to this address is 00621 (Village Market Post Office). A reliable landmark to include for couriers and visitors is: UN Complex Gigiri, directly opposite the US Embassy on UN Avenue.
What postal code should I use when sending mail to UN-Habitat?
Use postal code 00100 and address your mail to: P.O. Box 30030-00100, Nairobi, Kenya. UN-Habitat’s P.O. Box is registered at the GPO in the CBD, even though the organisation is physically located in Gigiri. For courier deliveries to UN-Habitat, use the physical UN campus address with postal code 00621.
What is the nearest post office to the UN Gigiri complex?
The nearest post office to the UN campus is the Gigiri Post Office on Limuru Road, postal code 00601. The Village Market Post Office (postal code 00621) is also extremely close — it is situated at Village Market shopping mall, which is directly adjacent to the UN complex. Both post offices serve the Gigiri area, but most UN agencies route their official mail through the GPO (00100) in the CBD.
Does the UN Nairobi complex use P.O. Box or physical address for courier deliveries?
For official letters and documents, UN agencies use P.O. Box addresses registered at the GPO (postal code 00100) or City Square (postal code 00200). For courier parcels and physical deliveries via DHL, G4S, Fargo, or similar services, you must use the physical street address: United Nations Avenue, Gigiri, Nairobi, with postal code 00621. Always include the recipient’s phone number so the courier can coordinate gate clearance with UN security.
Is Gigiri in Westlands constituency or North Nairobi?
Gigiri falls within the Westlands constituency administratively, but it is geographically part of the North Nairobi postal region as recognised on this site. It is located along Limuru Road and United Nations Avenue, north of Muthaiga and adjacent to Karura Forest. The area is also close to Runda Estate and the Rosslyn diplomatic zone. See our North Nairobi Postal Codes page for a full breakdown of the area.
Posta Kenya Contacts
For any queries about P.O. Box delivery, postal codes, or mail services for the Gigiri and North Nairobi area, you can reach Posta Kenya through the following channels:
| Contact Method | Details |
|---|---|
| Headquarters | Haile Selassie Avenue, Nairobi |
| Phone | 020 3243000 |
| Mobile (Toll-free) | 0800 724 900 |
| customercare@posta.co.ke | |
| Website | www.posta.co.ke |
| Post Office Finder | posta.co.ke/post-offices |
| MPost Registration | Dial *891# |
| Twitter / X | @PostaKenya |
| Postal Corporation of Kenya |
This Nairobi Postal Code directory is updated regularly. Last updated: May 2026. For the most current postal codes, always verify with Posta Kenya at posta.co.ke or the official UN Kenya contact directory at kenya.un.org.
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