Ol Kalou: The Farming Heartland Driving Nyandarua's Politics

Ol Kalou Constituency serves as the main agricultural and administrative center of Nyandarua County. The fertile highlands make it ideal for dairy and potato farming, helping the local economy thrive. The area is also known for its active political rivalries, which have grown even sharper ahead of the July 2026 by-election following the passing of long-serving MP Hon. David Njuguna Kiaraho.

Ol Kalou is one of five constituencies in Nyandarua County, found on the western side of the Aberdare Range. As the county headquarters, it is a key center for horticulture, dairy, and potato farming. Ol Kalou town is the main commercial and administrative hub.

Demographics and Administrative Units

The constituency is home to 13,690 residents and covers part of Nyandarua’s fertile highlands, which are ideal for intensive farming. There are 72,997 registered voters. 

Political Leadership & Election Record

The parliamentary seat became vacant after Hon. David Njuguna Kiaraho (Jubilee Party) passed away on March 29, 2026. A by-election is set for July 16, 2026.

2022 General Election: Hon. David Njuguna Kiaraho (Jubilee) kept his seat with 24,058 votes, beating Sammy Kamau Ngotho (UDA), who received 19,380 votes. 

2017 General Election: Hon. David Kiaraho won a second term with 37,751 votes, defeating independent candidate George Wambugu, who got 19,695 votes.

2013 General Election: Hon. David Kiaraho entered parliament on a TNA ticket with 19,844 votes, narrowly beating George Wambugu, who had 16,112 votes.

2026 By-Election

The upcoming contest will be a rematch between longtime rivals Sammy Kamau Ngotho (now DCP) and Samuel Muchina Nyagah (UDA). Many people are expected to follow the race closely.

Economic Profile

Since becoming the county headquarters, Ol Kalou has grown from a quiet outpost into a busy economic hub and a key part of the national government's Affordable Housing Programme. The town is seeing major upgrades, including new rural roads, urban improvements, modern markets, better water access, and more electricity connections.

As the center of Nyandarua County’s productivity, which is one of Kenya’s main food baskets, Ol Kalou leads in growing potatoes, maize, wheat, and horticultural crops. Dairy farming is still the backbone of the area, supported by groups like the Ol Kalou Dairy Co-operative Society, which uses automated milk pasteurisation and processing.

As the administrative capital, the town has attracted big commercial banks, micro-finance institutions, supermarkets, and agricultural trading networks that serve the wider region.

Major Development Focus Areas

Improving the potato and dairy value chains remains a top priority, with efforts like building cold storage facilities and creating direct market links. Developing infrastructure such as rural roads, clean water supply, and urban upgrades is still essential. Housing projects are underway to meet growing demand and support urban growth. Empowering youth through agribusiness is also a key focus.

Political Behaviour

Ol Kalou voters focus on issues like agriculture, infrastructure, and economic opportunities. The area is known for strong personal loyalties and long-running rivalries, especially between Hon. David Kiaraho’s supporters and his frequent challenger Sammy Kamau Ngotho.

National politics can influence results, but local performance on farming, roads, water, and market access often shapes voter choices. The upcoming July 16 by-election is seen as an important test of party strength in the Mount Kenya region before the 2027 General Election.

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