Kenya's County Profiles: Understanding the 47 Counties Created by the 2010 Constitution

Kenya's 47 counties, established by the Constitution of Kenya 2010, represent the most ambitious governance decentralization in Africa. Devolution transferred significant powers, functions, and resources from the national government to county governments, fundamentally reshaping how public services are delivered, how development priorities are set, and how citizens participate in governance. With county governments collectively managing over KES 495.7 billion in the 2025/2026 fiscal year, understanding the economic profiles, governance structures, and development trajectories of Kenya's counties is essential for investors, policymakers, and citizens alike.

The Devolution Framework

Under the Fourth Schedule of the Constitution, county governments exercise authority over agriculture, county health services, pre-primary education, county transport, trade development and regulation, county planning and development, and county public works, among other functions. Each county is governed by an elected Governor as the chief executive, a Deputy Governor, an appointed County Executive Committee, and a County Assembly comprising elected and nominated Members of County Assembly (MCAs).

The Commission on Revenue Allocation (CRA) determines the equitable share formula for distributing national revenue among counties. The Fourth Basis for revenue allocation, covering 2025/26 to 2029/30, distributes funds based on five parameters: population size, basic equal share, land area, headcount poverty rate, and income distance measured by each county's Gross County Product. For 2025/2026, the equitable share allocation is projected at KES 405.1 billion, a 1.25 percent increase from KES 400.1 billion in 2024/25.

Economic Powerhouses: Kenya's Largest County Economies

Nairobi County dominates Kenya's economic landscape, accounting for 27.4 percent of national Gross Value Added (GVA) in 2024. As the capital city and East Africa's commercial hub, Nairobi hosts the headquarters of major corporations, international organizations, and financial institutions. The county receives the largest equitable share allocation at KES 21.12 billion for 2025/26, though its locally generated revenue far exceeds transfers from the national government. Key sectors include financial services, technology, real estate, manufacturing, and hospitality.

Kiambu County ranks second in economic output at 5.5 percent of national GVA, driven by its proximity to Nairobi, thriving manufacturing sector, commercial agriculture including coffee and horticulture, and rapidly growing satellite towns like Thika, Ruiru, and Juja. Nakuru County contributes 5.2 percent of GVA, anchored by agriculture, tourism centred on Lake Nakuru National Park, and the growing Nakuru City economy. Mombasa County at 4.8 percent of GVA benefits from the Port of Mombasa — East Africa's largest seaport — tourism along the Indian Ocean coast, and an expanding manufacturing sector. Together, these four counties contribute approximately 42.9 percent of Kenya's national GVA.

Fastest-Growing County Economies

Between 2020 and 2024, the national average GVA growth was 4.5 percent, but 21 counties recorded growth above this benchmark. Tana River County led at 8.4 percent growth, driven by agricultural expansion and infrastructure investment. Isiolo County at 7.9 percent has benefited from the LAPSSET corridor development and growing tourism. Mandera County at 6.6 percent and Kajiado County at 6.2 percent have seen rapid growth from trade, urban expansion, and livestock commercialization respectively.

These growth patterns demonstrate that devolution is gradually redistributing economic opportunity beyond the traditional Nairobi-Mombasa corridor, though significant disparities remain between counties in absolute economic output, per capita income, and human development indicators.

County Revenue and Budget Performance

Total available funds to county governments reached KES 533.11 billion in 2024/2025, comprising equitable share allocations, conditional grants, loans, and own-source revenue. Counties with the highest development budget allocations as a proportion of total spending in 2024/25 include Kilifi at 53.4 percent, Kwale at 46.7 percent, and Siaya at 44.5 percent. The national average allocation to development was 36.4 percent, indicating that many counties still spend the majority of their budgets on recurrent expenditure rather than capital projects.

Budget absorption — the ability to actually spend allocated development funds — varies dramatically. In the first quarter of 2025/2026, Isiolo County achieved the highest overall budget absorption at 21 percent, followed by Kitui at 18 percent, and Machakos, Nyeri, and Uasin Gishu each at 14 percent. Low absorption rates in many counties indicate capacity challenges in project planning, procurement, and implementation that continue to hinder development outcomes.

Regional Profiles by Economic Zone

Central Kenya Counties (Kiambu, Murang'a, Kirinyaga, Nyeri, Nyandarua) form Kenya's agricultural heartland, producing tea, coffee, dairy products, and horticulture crops. The region benefits from high literacy rates, proximity to Nairobi markets, and well-developed infrastructure. Nyeri and Kirinyaga have earned recognition for efficient county governance and development project delivery.

Rift Valley Counties (Nakuru, Uasin Gishu, Nandi, Kericho, Bomet, Baringo, among others) are Kenya's breadbasket, producing the bulk of the country's wheat, maize, and tea. Uasin Gishu, centred on Eldoret town, has emerged as a significant economic hub with strong agriculture, aviation, and athletics training industries. Kericho and Bomet lead in tea production, with their highlands producing some of Kenya's finest quality teas.

Coastal Counties (Mombasa, Kilifi, Kwale, Taita Taveta, Lamu, Tana River) anchor Kenya's tourism and blue economy sectors. Beyond the Port of Mombasa, the coastal region is seeing investment in extractive industries, particularly Kwale's titanium mining operations by Base Titanium, and Lamu's positioning as a future transport and logistics hub through the LAPSSET corridor. Kilifi has emerged as a digital nomad destination and tech hub.

Western Kenya Counties (Kakamega, Bungoma, Busia, Vihiga) are densely populated agricultural regions producing sugarcane, maize, and beans. Kakamega hosts the Kakamega Forest, the only tropical rainforest in Kenya, and the region is investing in gold mining modernization and value-added agriculture. Lake Region Counties (Kisumu, Siaya, Homa Bay, Migori, Kisii, Nyamira) revolve around Lake Victoria's fishing industry and sugarcane agriculture, with Kisumu emerging as a Special Economic Zone host.

Northern and Eastern Counties (Turkana, Marsabit, Wajir, Garissa, Mandera, Isiolo, Samburu) cover the largest land area but have the lowest population density and development indicators. However, these counties hold significant economic potential through livestock production, renewable energy (Turkana's Lake Turkana Wind Power project generates 310 MW), extractive resources, and the LAPSSET corridor. The discovery of significant aquifer systems in Turkana has transformed the region's water security outlook.

Challenges Facing County Governments

Despite devolution's achievements, county governments face persistent challenges including over-reliance on national government transfers (own-source revenue averages less than 15 percent of total budgets), bloated wage bills consuming 50 to 70 percent of budgets in some counties, procurement irregularities flagged by the Auditor General, and inadequate technical capacity in planning and project management. Inter-governmental coordination between county and national functions remains a work in progress, particularly in health and agriculture where responsibilities overlap.

The CRA and World Bank are rolling out the second phase of County Revenue Enhancement Plans to help counties increase own-source revenue, reduce dependency on transfers, and improve fiscal sustainability. These initiatives, combined with growing citizen engagement through public participation mechanisms, are gradually strengthening county governance and accountability across Kenya's 47 devolved units.