Gross county product (GCP) is the total value of everything produced within a county’s borders. When economists talk about the “size” of county economy, they are referring to GCP. A county’s GCP is calculated by taking into account the monetary worth of a county’s goods and services within one year. GCP provides an economic snapshot of a county, used to estimate the size of an economy and growth rate. It’s a measure of economic activity for a given county.
Here are the top 10 largest county contributors to Kenya’s GDP.
| Rank | County | % contribution to Kenya’s GDP |
| 1. | Nairobi | 27.5% |
| 2. | Kiambu | 5.9% |
| 3. | Mombasa | 5.2% |
| 4. | Nakuru | 4.9% |
| 5. | Machakos | 3.5% |
| 6. | Meru | 3.2% |
| 7. | Kisumu | 2.6% |
| 8. | Uasin Gishu | 2.4% |
| 9. | Kilifi | 2.2% |
| 10. | Kajiado | 2.2% |
| Kakamega | 2.2% |
