Kisii County, officially County Number 045, sits in the southwestern highlands of Kenya in what was formerly the Nyanza Province. The county is home to the Abagusii (Gusii) people and is known locally as Bosongo a name that reflects the county town of Kisii, which serves as the administrative and commercial nerve centre of the entire region.
Kisii Town lies approximately 300 kilometres west of Nairobi and stands as one of the busiest towns in the former Nyanza region, second only to Kisumu in terms of commercial activity. The town is served by the Kisii General Post Office (GPO), which carries the main postal code 40200. All post offices within Kisii County fall under postal region prefix 4, placing them in the wider western Kenya postal zone.
Kisii County — Key Facts
| Detail | Information |
|---|---|
| Official County Name | Kisii County |
| County Number | 045 |
| Local Name | Bosongo |
| Former Province | Nyanza Province |
| County Capital | Kisii Town |
| Distance from Nairobi | ~300 km west |
| Land Area | ~1,332 km² |
| Population (2019 Census) | 1,266,860 |
| Population (2023 Estimate) | ~1,344,907 |
| Constituencies | 9 |
| Sub-Counties | 11 |
| County Assembly Wards | 45 |
| Locations | 103 |
| Sub-Locations | 237 |
| Main Postal Code | 40200 (Kisii GPO) |
| Postal Region Prefix | 4 (Western Kenya Region) |
| Governor (Current) | Simba Arati |
| Neighbouring Counties | Nyamira, Narok, Homa Bay, Migori, Bomet |
Kisii County Post Offices and Postal Codes
Kisii County is served by the main Kisii General Post Office (GPO) located in Kisii Town, plus a network of branch post offices spread across the county’s towns, trading centres, and rural areas. Each post office serves the surrounding estates, wards, and villages within its catchment area.
When writing a postal address in Kisii County, the standard format is:
P.O. Box [Your Box Number]-[Postal Code], [Town Name], Kenya
For example, a letter sent to Kisii Town would be addressed as: P.O. Box 123-40200, Kisii, Kenya.
All Kisii County Post Offices — Complete Postal Codes List
| Postal Code | Post Office / Town | Sub-County / Area |
|---|---|---|
| 40200 | Kisii (GPO — General Post Office) | Kisii Central / Nyaribari Chache |
| 40201 | Gesusu | Nyaribari Chache |
| 40202 | Keroka | Masaba South / Nyaribari Masaba |
| 40203 | Nyamache | Nyamache |
| 40204 | Ogembo | South Mugirango |
| 40205 | Nyambunwa | Kitutu Chache South |
| 40206 | Nyamarambe | South Mugirango |
| 40208 | Etago | Etago / South Mugirango |
| 40209 | Igare | Bomachoge Chache |
| 40210 | Itumbe | Bomachoge Borabu |
| 40211 | Kenyenya | Kenyenya / Bomachoge Borabu |
| 40212 | Keumbu | Nyaribari Chache |
| 40213 | Kiamokama | Kitutu Chache South |
| 40214 | Marani | Marani / Kitutu Chache North |
| 40215 | Masimba | Bomachoge Chache |
| 40218 | Nyangusu | Bobasi |
| 40220 | Riosiri | Nyaribari Masaba |
| 40221 | Omogonchoro | Bobasi |
| 40229 | Tabaka | Kitutu Chache South |
| 40514 | Nyaramba | Nyaribari Masaba |
| 40515 | Kegogi | Bobasi |
| 40516 | Magena | Bobasi |
Kisii County Constituencies and Their Postal Codes
Kisii County has 9 constituencies, each covering distinct geographical areas across the Gusii highlands. When sending mail to a specific constituency area, use the postal code of the nearest post office within that constituency.
| Constituency | Main Post Office | Postal Code |
|---|---|---|
| Kitutu Chache South | Kisii GPO / Kiamokama / Nyambunwa / Tabaka | 40200 / 40213 / 40205 / 40229 |
| Kitutu Chache North | Marani | 40214 |
| Nyaribari Masaba | Keroka / Riosiri / Nyaramba | 40202 / 40220 / 40514 |
| Nyaribari Chache | Kisii GPO / Gesusu / Keumbu | 40200 / 40201 / 40212 |
| Bomachoge Borabu | Kenyenya / Itumbe | 40211 / 40210 |
| Bomachoge Chache | Masimba / Igare | 40215 / 40209 |
| Bobasi | Nyangusu / Omogonchoro / Kegogi / Magena | 40218 / 40221 / 40515 / 40516 |
| South Mugirango | Ogembo / Nyamarambe / Etago | 40204 / 40206 / 40208 |
| Bonchari | Kisii GPO (served from Kisii Town) | 40200 |
Kisii Sub-Counties and Postal Codes
The 11 sub-counties of Kisii are the primary administrative units used for government services, healthcare, education, and postal services. Below is a breakdown of each sub-county and the postal codes that serve them.
| Sub-County | Related Constituency | Postal Code(s) |
|---|---|---|
| Kisii Central (Nyaribari Chache) | Nyaribari Chache | 40200, 40201, 40212 |
| Masaba South (Nyaribari Masaba) | Nyaribari Masaba | 40202, 40220, 40514 |
| Kitutu Central (Kitutu Chache South) | Kitutu Chache South | 40200, 40205, 40213, 40229 |
| Marani (Kitutu Chache North) | Kitutu Chache North | 40214 |
| Kenyenya (Bomachoge Borabu) | Bomachoge Borabu | 40211, 40210 |
| Gucha (Bomachoge Chache) | Bomachoge Chache | 40215, 40209 |
| Kisii South (Bonchari) | Bonchari | 40200 |
| Nyamache | Bobasi | 40203 |
| Sameta | Bobasi | 40218, 40221 |
| Etago (South Mugirango) | South Mugirango | 40204, 40206, 40208 |
| Gucha South (South Mugirango) | South Mugirango | 40204, 40206 |
Key Institutions in Kisii County and Their Postal Codes
Many institutions in Kisii County have their own dedicated P.O. Box numbers under the relevant local post office. Below is a guide to the postal codes used by the major hospitals, universities, schools, and government offices across the county.
Hospitals and Health Facilities
Kisii County has 168 health facilities in total, including 25 hospitals, 28 health centres, and 91 dispensaries. The county referral hospital is Kisii Teaching and Referral Hospital, which uses the main Kisii GPO postal code.
| Health Facility | Location | Postal Code |
|---|---|---|
| Kisii Teaching and Referral Hospital | Kisii Town | 40200 |
| Kisii County Referral Hospital | Kisii Town | 40200 |
| Keroka Sub-County Hospital | Keroka | 40202 |
| Ogembo Sub-County Hospital | Ogembo | 40204 |
| Kenyenya Sub-County Hospital | Kenyenya | 40211 |
| Marani Sub-County Hospital | Marani | 40214 |
| Nyamache Sub-County Hospital | Nyamache | 40203 |
| Itumbe Sub-County Hospital | Itumbe | 40210 |
| AIC Litein Mission Hospital | Litein (near Kericho border) | 40200 |
Universities and Colleges
| Institution | Location | Postal Code |
|---|---|---|
| Kisii University (Main Campus) | Bosango, Kisii Town | 40200 |
| Kisii University — Ogembo Campus | Ogembo | 40204 |
| Mount Kenya University — Kisii Centre | Kisii Town | 40200 |
| Kenya Medical Training College — Kisii | Kisii Town | 40200 |
| Kisii Teachers Training College | Kisii Town | 40200 |
Secondary Schools
| School Name | Location | Postal Code |
|---|---|---|
| Kisii School | Kisii Town | 40200 |
| Nyabururu Girls High School | Kisii Town | 40200 |
| Kereri Girls High School | Kisii Town | 40200 |
| Manga High School | Nyaribari Masaba | 40200 |
| Keroka Boys High School | Keroka | 40202 |
| Marani High School | Marani | 40214 |
| Kenyenya High School | Kenyenya | 40211 |
| Masimba High School | Masimba | 40215 |
Government Offices and Key Facilities
| Office / Facility | Location | Postal Code |
|---|---|---|
| Kisii County Government Headquarters | Kisii Town | 40200 |
| Kisii National Government Office | Kisii Town | 40200 |
| Kisii Law Courts | Kisii Town | 40200 |
| KRA Kisii Tax Office | Kisii Town | 40200 |
| NHIF Kisii Branch | Kisii Town | 40200 |
| NSSF Kisii Branch | Kisii Town | 40200 |
| Gusii Stadium | Kisii Town | 40200 |
| Tabaka Soapstone Carvings Centre | Tabaka | 40229 |
Frequently Asked Questions
What is the postal code for Kisii Town?
The postal code for Kisii Town is 40200. This is the code for the Kisii General Post Office (GPO), which is the main post office serving Kisii Town and the surrounding Kisii Central area. When addressing mail to Kisii Town, write: P.O. Box [Number]-40200, Kisii, Kenya.
What is the ZIP code for Kisii, Kenya?
Kenya does not use ZIP codes that system belongs to the United States Postal Service (USPS). In Kenya, the equivalent is called a postal code. The postal code for Kisii Town is 40200. When filling in online forms that ask for a ZIP code for a Kisii address, enter 40200 in that field.
What is the postal code for Keroka?
The postal code for Keroka is 40202. Keroka is a major town in the Nyaribari Masaba area of Kisii County and has its own post office. Mail addressed to Keroka should use: P.O. Box [Number]-40202, Keroka, Kenya.
What is the postal code for Ogembo?
The postal code for Ogembo is 40204. Ogembo is the headquarters of the South Mugirango area. Its post office also serves the surrounding communities including Nyamarambe.
What is the postal code for Kenyenya?
The postal code for Kenyenya is 40211. Kenyenya is the main town in the Bomachoge Borabu area and has its own dedicated post office.
What is the postal code for Marani?
The postal code for Marani is 40214. Marani serves as the headquarters for the Kitutu Chache North constituency and has a post office that covers the surrounding areas including parts of Marani Sub-County.
What is the postal code for Tabaka?
The postal code for Tabaka is 40229. Tabaka is world-famous for its soapstone carvings and is located in the Kitutu Chache South area of Kisii County.
Does Kisii have home mail delivery?
No. Kisii County does not have home or door-to-door mail delivery. Like most of Kenya outside Nairobi, all mail must be collected from the post office where you have rented a P.O. Box. If you want to receive mail in Kisii, you need to rent a P.O. Box at the nearest post office. Contact Kisii GPO on 058 30131 to enquire about P.O. Box rental.
How many post offices are there in Kisii County?
Kisii County has 22 post offices, headed by the main Kisii GPO (40200) in Kisii Town. The other 21 branch post offices are spread across the county’s major towns and trading centres, from Keroka in the east to Kenyenya in the south.
What county number is Kisii?
Kisii is County Number 045 in Kenya’s 47-county devolved government structure. Its neighbouring counties are Nyamira (046) to the north-east, Narok to the south, Homa Bay and Migori to the west, and Bomet to the south-east.
What is the postal code for Kisii University?
Kisii University’s main campus is located in Bosango, Kisii Town, and uses the postal code 40200. Mail for Kisii University is addressed as: P.O. Box 408-40200, Kisii, Kenya.
Kisii Post Office Contact Information
For all postal services in Kisii County including P.O. Box rental, parcel collection, money orders, and registered mail contact the Kisii General Post Office directly using the details below.