Kenya's Richest Counties By Contribution to GDP [2026]

Nairobi City had the largest economy among Kenya’s 47 counties, with a Gross County Product (GCP) of Ksh4.1 trillion, according to figures in the 2025 Gross County Product report by the Kenya National Bureau of Statistics (KNBS). 

Kiambu County ranked second, with an economy valued at Ksh819.83 billion, followed by Nakuru at Ksh771.78 billion and Mombasa at Ksh711.09 billion. Meru completed the top five, with a GCP of Ksh525.78 billion.

The figures, which measure the value of economic activity taking place within each county, show the differences in the size of county economies across the country. 

“Nairobi City County’s economy was estimated at Ksh4.1 trillion, followed by Kiambu County at Ksh819.8 billion and Nakuru at Ksh771.8 billion. Isiolo and Samburu counties registered the lowest GCP levels at Ksh46.2 and Ksh44.8 billion, respectively,” read the report in part.

“The five largest county economies had GCP exceeding Ksh500 billion, namely Nairobi, Kiambu, Nakuru, Mombasa and Meru. On the other hand, ten counties recorded GCP lower than Ksh100 billion.”

Also Read: Kenya's Richest Counties By Contribution to GDP

Machakos ranked sixth, with a GCP of Ksh476.36 billion, followed by Uasin Gishu at Ksh382.74 billion and Kisumu at Ksh370.85 billion. Kilifi and Kakamega rounded out the top 10, with economies valued at Ksh321.35 billion and Ksh316.39 billion, respectively.

Bungoma, Murang’a, Kisii and Nyeri were also among the counties with economies valued at more than Ksh280 billion. Their GCP figures stood at Ksh305.31 billion, Ksh295.89 billion, Ksh287.47 billion and Ksh286.88 billion, respectively.

At the lower end of the ranking, Samburu recorded the smallest economy, with a GCP of Ksh44.85 billion. Isiolo followed at Ksh46.22 billion, while Lamu and Tana River had economies valued at Ksh50.22 billion and Ksh51.15 billion, respectively.

Also Read: New Survey Ranks Top 15 Best Counties to Run a Small Business in Kenya

Here is the Full List of the 47 Counties Ranked by GCP

The following is the ranking of all 47 counties, from the largest to the smallest economy, based on the GCP figures in the report:

1. Nairobi City – Ksh4.11 trillion
2. Kiambu – Ksh819.83 billion
3. Nakuru – Ksh771.78 billion
4. Mombasa – Ksh711.09 billion
5. Meru – Ksh525.78 billion
6. Machakos – Ksh476.36 billion
7. Uasin Gishu – Ksh382.74 billion
8. Kisumu – Ksh370.85 billion
9. Kilifi – Ksh321.35 billion
10. Kakamega – Ksh316.39 billion
11. Bungoma – Ksh305.31 billion
12. Murang’a – Ksh295.89 billion
13. Kisii – Ksh287.47 billion
14. Nyeri – Ksh286.88 billion
15. Narok – Ksh255.96 billion
16. Kericho – Ksh251.27 billion
17. Trans Nzoia – Ksh247.91 billion
18. Kajiado – Ksh243.37 billion
19. Nandi – Ksh235.50 billion
20. Bomet – Ksh221.43 billion
21. Embu – Ksh218.89 billion
22. Nyandarua – Ksh218.17 billion
23. Homa Bay – Ksh200.56 billion
24. Kitui – Ksh196.33 billion
25. Kirinyaga – Ksh185.98 billion
26. Migori – Ksh183.34 billion
27. Turkana – Ksh178.44 billion
28. Kwale – Ksh169.38 billion
29. Nyamira – Ksh169.15 billion
30. Siaya – Ksh163.87 billion
31. Makueni – Ksh159.22 billion
32. Elgeyo-Marakwet – Ksh150.32 billion
33. Laikipia – Ksh134.91 billion
34. Busia – Ksh132.20 billion
35. Baringo – Ksh119.13 billion
36. Vihiga – Ksh116.11 billion
37. West Pokot – Ksh111.13 billion
38. Taita Taveta – Ksh97.88 billion
39. Tharaka-Nithi – Ksh95.07 billion
40. Garissa – Ksh89.17 billion
41. Marsabit – Ksh88.85 billion
42. Mandera – Ksh88.40 billion
43. Wajir – Ksh76.43 billion
44. Tana River – Ksh51.15 billion
45. Lamu – Ksh50.22 billion
46. Isiolo – Ksh46.22 billion
47. Samburu – Ksh44.85 billion