Nyandarua County is a County in the former Central Province of Kenya. Its capital and largest town is Ol Kalou. Formerly the capital was Nyahururu, which is now part of the Laikipia County. Nyandarua County has a population of 596,268  and an area of 3,304 km². The county is located on the northwestern part of the old Central Province and contains the Aberdare Ranges.
The county was split into two in 2007: Nyandarua North District and Nyandarua South District. However, with the promulgation in 2010 of the new constitution, these have been re-organised as sub-counties of Nyandarua County. Daniel Waithaka was elected the first governor of the County 2013 General Election and Francis Kimemia seconds him in August 2017 elections.
Ol Joro Orok
Ol Kalou Constituency
Ol Jorok Constituency
Nyandarua County is serviced by several government hospitals; Nyahururu, Ngano. Ol Kalou district hospital. Mission hospital funded by church and NGO, Dispensary i.e.Milangine Health Centre and numbers of private hospitals.County hospitals receive patients from all over the county and in case of referral refer them to Nakuru or Nyeri provincial hospital and then to Kenyatta National Hospital
The main economic activity in Nyandarua is farming (crop cultivation and dairy farming). In late 1990s Nyandarua was a leading producer of pyrethrum, however Kenya Pyrethrum Board the parastatal that was given the role of purchasing, processing and marketing the crop collapsed because of poor management and corruption, severely undermining the livelihood of many farmers. Nyandarua county is well known as a giant in potato farming. However, there has been a number of challenges that are associated with farming such as fluctuation of the market, poor roads, and crop diseases. Aberdare forest which covers a larger area of the country, attract local and international tourist who make a positive income to the local society.
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