County Schools in Kenya form the third tier of secondary schools; after National and Extra County schools, respectively. The schools admit students from majorly within the country. Admissions to these schools is done online by the Ministry of Education.These schools are in 3 Categories i.e category 1 (C1), Category 2 (C2) and Category 3 (C3). The Schools are either of Mixed or single sex type.

Here are the County Schools in Nyandarua County:

School  Code	School Name	Category	Type
07201103	SHAMATA GIRLS SECONDARY SCHOOL	County	Girls
07201105	NGAINDEITHIA SECONDARY SCHOOL	County	Mixed
07201106	MUKOE SECONDARY SCHOOL	County	Mixed
07201115	KAHUHO SECONDARY SCHOOL	County	Mixed
07209103	MWENDA-ANDU SECONDARY SCHOOL	County	Mixed
07209104	KIMURI SECONDARY SCHOOL	County	Mixed
07209106	MKUNGI SECONDARY SCHOOL	County	Mixed
07209107	MURUAKI SECONDARY SCHOOL	County	Boys
07213103	SALIENT HIGH SCHOOL	County	Mixed
07213104	KALOU SECONDARY SCHOOL	County	Mixed
07214130	KABATI SECONDARY SCHOOL	County	Mixed
07215201	MIHARATI SECONDARY SCHOOL	County	Boys
07215207	NDEMI SECONDARY SCHOOL	County	Mixed
07215217	MIKEU SECONDARY SCHOOL	County	Mixed
07215223	KIPIPIRI SCHOOL	County	Boys
07216102	BONGO GIRLS SECONDARY SCHOOL	County	Girls
07216110	HENI SECONDARY SCHOOL	County	Mixed

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