Quick Answer: Kisumu County’s main postal code is 40100 for the Kisumu GPO on Omolo Agar Road. However, the county uses multiple codes across its 7 sub-counties: 40101 for Ahero (Nyando), 40105 for Maseno (Kisumu West), 40107 for Muhoroni, 40104 for Koru, 40116 for Chemelil, 40110 for Songhor, and 40141 for Winam (Kisumu GPO Extension). Always use the specific code for your area; using 40100 for all Kisumu addresses is a very common mistake that causes mail delays.
Search Kisumu Postal Codes
Are you looking for the correct postal code in Kisumu? You are in the right place. Kisumu County is Kenya’s third-largest city and the administrative, commercial, and cultural capital of the Lake Victoria Basin. Designated as County Number 042 under the 2010 Kenyan Constitution, Kisumu sits on the northeastern shores of Lake Victoria, Africa’s largest freshwater lake, making it one of the most strategically located counties in East Africa. With a population of over 1.15 million people (2019 census), the county is a major hub for trade, fishing, education, agriculture, and regional transport.
Kisumu uses the postal region prefix 40, which identifies it as part of the Nyanza postal region managed by Posta Kenya. This is different from Nairobi’s 00 prefix, Mombasa’s 80 prefix, or Nakuru’s 20 prefix. The county is divided into 7 sub-counties (Kisumu Central, Kisumu East, Kisumu West, Muhoroni, Nyakach, Nyando, and Seme), each served by its own post offices and postal codes. Therefore, using a single code, such as 40100, for every Kisumu address is incorrect and a common mistake that leads to mail sorting errors and delivery delays.
What Are Kisumu Postal Codes?
A Kisumu postal code is a five-digit number assigned by Posta Kenya to identify specific post offices and their delivery zones within Kisumu County. The code begins with the prefix 40, which indicates that the location is part of the broader Nyanza postal region. The remaining three digits identify the specific post office or delivery area within that region.
For example, Kisumu’s main code, 40100, breaks down as follows:
- 40 = Nyanza region (Kisumu County and surrounding areas)
- 100 = Kisumu Town GPO (General Post Office)
This format follows Kenya’s standard postal code structure used across all 47 counties: the first two digits represent the broader postal region, while the final three digits pinpoint the specific post office or delivery zone.
All 7 Kisumu Sub-Counties and Their Postal Codes
Kisumu County is divided into 7 sub-counties for administrative purposes, and each sub-county is assigned its own postal codes, which are vital for accurate sorting and delivery of mail.
| Sub-County | Main Postal Code(s) | Main Town / Center | Population (Approx.) |
|---|---|---|---|
| Kisumu Central | 40100, 40103, 40141 | Kisumu City CBD | 300,000+ |
| Kisumu East | 40100 | Kajulu, Kolwa | 180,000+ |
| Kisumu West | 40100, 40105, 40102 | Maseno, Kombewa | 170,000+ |
| Muhoroni | 40107, 40104, 40106, 40110, 40116, 40119 | Muhoroni Town, Koru, Chemelil | 200,000+ |
| Nyakach | 40100 | Sondu, Wang’chieng | 160,000+ |
| Nyando | 40101, 40113 | Ahero, Awasi | 190,000+ |
| Seme | 40100, 40102 | Kombewa, Boro | 150,000+ |
Kisumu Central – (40100, 40103, 40141)
Kisumu Central is the heart of Kisumu City and the county’s administrative and commercial hub. It is home to the main Kisumu GPO (General Post Office) on Omolo Agar Road, which handles the largest volume of mail in the entire county. The sub-county covers the CBD, the lakefront, and the surrounding densely populated estates. It is also home to Kisumu International Airport, the Kisumu Museum, the Ferry terminus, and the main Fish Market. The postal codes serving Kisumu Central are as follows:
- 40100 – Kisumu Town GPO (Central Business District, Milimani, Migosi, Nyalenda, Manyatta, Obunga, Riat Hills, and most urban estates)
- 40103 – Kondele Post Office (Kondele Bypass Road area and surrounding wards)
- 40141 – Winam Post Office / Kisumu GPO Extension (Makasembo Road, opposite Kiwasco)
Kisumu East – (40100)
Kisumu East is a peri-urban sub-county located on the eastern fringe of Kisumu City. The area primarily covers the Kajulu, Kolwa Central, Kolwa East, and Manyatta ‘B’ wards. Though mostly rural-transitional in character, parts of Kisumu East are rapidly expanding as the city grows outward. The entire sub-county uses the main 40100 postal code, as residents collect mail from the Kisumu GPO or the Kondele Post Office. Key areas covered include:
- Kajulu Ward – Got Nyabondo, Kadero, Konya, Okok, Wathorego
- Kolwa Central – Kasule, Nyalunya
- Kolwa East – Buoye, Chiga, Mayenya
- Manyatta ‘B’ – Upper and Lower Manyatta areas
Kisumu West – (40100, 40105, 40102)
Kisumu West is strategically located between the city and the Siaya County border, bordering Lake Victoria to the west and north. It is most well-known for being home to Maseno University, one of Kenya’s leading public universities, and the historical Maseno Mission. The sub-county also borders the Kisumu-Bondo and Kisumu-Busia highways, making it a key transit zone. The postal codes serving Kisumu West are:
- 40100 – Shared with the main GPO, covers West Kisumu, North West Kisumu, South West Kisumu, and Central Kisumu wards
- 40105 – Maseno Post Office (Maseno Town and Maseno University campus)
- 40102 – Kombewa Post Office (Kombewa Town and surrounding market area)
Muhoroni – (40107, 40104, 40106, 40110, 40116, 40119)
Muhoroni is the most postal-code-rich sub-county in Kisumu County. It covers the famous sugar belt of western Kenya, an area dominated by sugarcane farming, large-scale sugar milling companies, and industrial agriculture. Muhoroni is home to the Chemelil Sugar Factory, the Muhoroni Sugar Company, and the Koru-Soin sugar zone. Given the size and spread of the sub-county, it has no fewer than six post offices, each with its own unique postal code:
- 40107 – Muhoroni Post Office (Muhoroni Town center — the sub-county’s main post office)
- 40104 – Koru Post Office (Koru Town — serves Fort Tenan and surrounding areas)
- 40106 – Miwani Post Office (Miwani Town — serves Miwani Sugar Company area)
- 40110 – Songhor Post Office (Songhor Town and surrounding agricultural areas)
- 40116 – Chemelil Post Office (Chemelil Town and the Chemelil Sugar Factory estate)
- 40119 – Kibigori Post Office (Kibigori Town and surrounding areas)
Nyakach – (40100)
Nyakach is a largely rural sub-county located on the southern shores of Lake Victoria, bordering Homa Bay and Kericho counties. It is known for its fishing communities, small-scale subsistence farming, and the important Sondu-Miriu Hydropower Project on the Sondu River. Despite having a distinct geographic identity, Nyakach lacks its own dedicated GPO and shares the 40100 code with the main Kisumu GPO. Residents in Nyakach typically collect mail from the Kisumu GPO or designated rural collection points. Key areas in Nyakach include:
- Sondu Town Center
- Wang’chieng Market
- God Jope (Nyakach South Ward)
- East Kano, West Kano farming settlements
- Lake Victoria lakeside fishing villages (Kowuor, Kadimo, Kabuoch)
Nyando – (40101, 40113)
Nyando is a low-lying sub-county located southeast of Kisumu City, along the flood plains of the Nyando River and Lake Victoria’s eastern shores. It is famous for the Ahero National Rice Irrigation Scheme, one of Kenya’s oldest and largest irrigation projects. Nyando is also known for large-scale sugarcane farming and is part of Kisumu’s agricultural hinterland. The sub-county is served by two postal codes:
- 40101 – Ahero Post Office (Ahero Town, the main commercial center of Nyando sub-county)
- 40113 – Pembe Tatu Post Office (Pembe Tatu Center and surrounding Nyando wards)
Seme – (40100, 40102)
Seme sub-county occupies the northwestern shoreline of Lake Victoria, stretching from the Kisumu City limits toward Siaya County. It is predominantly a fishing and small-scale farming community, with a rugged shoreline that is home to numerous traditional fishing villages. The sub-county shares two postal codes with neighboring areas:
- • 40100 – Shared with Kisumu GPO (covers North Seme, South Seme, and Central Seme wards)
- • 40102 – Kombewa Post Office (covers Kombewa ward and the East Seme border areas)
Key areas in Seme include Kombewa Market, Boro Trading Center, Karateng’, Ojolla, Kanyawegi, and the numerous Lake Victoria shoreline villages such as Dunga Beach and Hippo Point-adjacent communities.
Complete List of Kisumu Post Offices
Posta Kenya operates multiple post offices throughout Kisumu County, each serving specific geographic areas and communities. The table below is the most comprehensive and up-to-date list of all active post offices in Kisumu County, including their postal codes, sub-county locations, physical locations, and available services.
| Post Office Name | Postal Code | Sub-County | Physical Location | Key Services |
|---|---|---|---|---|
| Kisumu Town GPO | 40100 | Kisumu Central | Omolo Agar Road, CBD | Full service, P.O. Boxes, EMS domestic & international, money orders, registered mail, parcel dispatch, stamp sales |
| Winam (Kisumu GPO Extension) | 40141 | Kisumu Central | Makasembo Road, opposite Kiwasco | P.O. Boxes, mail delivery, counter services, MPost registration |
| Kondele Post Office | 40103 | Kisumu Central | Kondele Bypass Road, Kondele | P.O. Boxes, local mail delivery, parcel collection |
| Mega City Posta | 40100 | Kisumu Central | Mega City Mall, CBD | Counter services, bill payments, parcel drop-off, stamps |
| Ahero Post Office | 40101 | Nyando | Ahero Town Centre, Nyando | P.O. Boxes, mail delivery, parcel collection, counter services |
| Kombewa Post Office | 40102 | Kisumu West / Seme | Kombewa Town, off Kisumu-Busia Road | Local mail, P.O. Boxes, small parcels |
| Maseno Post Office | 40105 | Kisumu West | Maseno Town, near Maseno University Gate | P.O. Boxes (academic & personal), mail delivery, counter services |
| Miwani Post Office | 40106 | Muhoroni | Miwani Town, Miwani Sugar area | Local mail, P.O. Boxes, industrial/sugar estate mail |
| Muhoroni Post Office | 40107 | Muhoroni | Muhoroni Town Centre, Muhoroni | Full service, P.O. Boxes, EMS, parcel dispatch, money orders |
| Songhor Post Office | 40110 | Muhoroni | Songhor Town, Muhoroni Sub-County | Local mail, P.O. Boxes, agricultural zone delivery |
| Pembe Tatu Post Office | 40113 | Nyando | Pembe Tatu Centre, Nyando | Local mail, P.O. Boxes, counter services |
| Chemelil Post Office | 40116 | Muhoroni | Chemelil Town, near Chemelil Sugar Factory | P.O. Boxes, sugar factory estate mail, local mail, counter services |
| Kibigori Post Office | 40119 | Muhoroni | Kibigori Town, Muhoroni Sub-County | Local mail, P.O. Boxes, parcel collection |
| Koru Post Office | 40104 | Muhoroni | Koru Town Centre, off Kisumu-Kericho Road | Local mail, P.O. Boxes, Fort Tenan & surrounding area delivery |
| Dago Post Office | 40112 | Kisumu West / Seme | Dago Area, Kisumu North Ward | Local mail delivery, P.O. Boxes |
How to Use Kisumu Postal Codes Correctly
Knowing the correct postal code for your area in Kisumu is only half the job; knowing how to format your address properly is equally important. Posta Kenya uses a standard address format across all counties in Kenya, and Kisumu is no exception. Using the correct format ensures your mail is sorted quickly and delivered to the right post office without unnecessary delays or re-routing.
Standard P.O. Box Address Format
Correct format:
[Recipient Full Name]
P.O. Box [Number]-[Postal Code] [Town/Area]
[KENYA]
Example 1 – Kisumu CBD Address:
Jane Achieng
P.O. Box 1567-40100 Kisumu
KENYA
Example 2 – Muhoroni (Sugar Belt) Address:
Chemelil Sugar Factory Ltd
P.O. Box 234-40116 Chemelil
KENYA
Example 3 – Maseno University Address:
Dr. Peter Otieno
P.O. Box 333-40105 Maseno
KENYA
FAQs About Kisumu Postal Codes
What is the main postal code for Kisumu?
The main postal code for Kisumu is 40100. This is the code assigned to the Kisumu Town General Post Office (GPO) on Omolo Agar Road, and it covers most of the Kisumu CBD, Milimani, Migosi, Nyalenda, Kondele, Obunga, and many other urban estates within Kisumu Central sub-county.
Can I use 40100 for all addresses in Kisumu County?
No. While 40100 is the most recognized Kisumu code, it covers only the urban areas of Kisumu City. Each sub-county and major town has its own specific code. For example, Muhoroni uses 40107, Maseno uses 40105, Ahero uses 40101, Chemelil uses 40116, and Koru uses 40104. Using 40100 for these areas will cause your mail to be misrouted or delayed, as it will be delivered to the Kisumu GPO instead of the correct local post office.
What is the postal code for Maseno University?
Maseno University uses postal code 40105, which is the code for the Maseno Post Office near the main gate. Students, staff, and institutional mail should always use P.O. Box [number]-40105 Maseno, Kenya.
How many sub-counties does Kisumu County have?
Kisumu County has 7 sub-counties: Kisumu Central, Kisumu East, Kisumu West, Muhoroni, Nyakach, Nyando, and Seme. Each sub-county has its own distinct geography, population, and in most cases, its own postal codes.
Where is the Kisumu GPO located?
The Kisumu General Post Office (GPO) is located on Omolo Agar Road in the Kisumu Central Business District (CBD). It is the main post office for the entire county and can be reached at +254 734 662626, +254 057 2020488, or +254 057 2025517. Operating hours are Monday to Friday 8:00 AM – 5:00 PM, and Saturday 9:00 AM – 12:00 PM.
What is the postal code for Ahero town?
Ahero Town in Nyando sub-county uses postal code 40101.
Posta Kenya Contact Information for Kisumu
For all postal enquiries, P.O. Box applications, parcel tracking, or EMS services in Kisumu County, you can contact Posta Kenya through the following channels:
| Contact Type | Details |
|---|---|
| Kisumu GPO Phone | +254 734 662626 / +254 057 2020488 / +254 057 2025517 |
| Posta Kenya Headquarters | Posta House, Kenyatta Avenue, Nairobi |
| National Support Line | 0730642000 / 0719072000 / 0203242000 |
| Customer Care | 0719072600 / 0730642600 / 0203242600 |
| info@posta.co.ke / customercare@posta.co.ke | |
| Kisumu GPO Address | P.O. Box 470 – 40100 Kisumu, Kenya |
| Online Portal (P.O. Box Applications) | https://apps.posta.co.ke/boxupdate/ |