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 Isiolo County:

School  Code	School Name	Category	Type
17306301	OLDONYIRO SECONDARY SCHOOL	County	Mixed
17322301	SERICHO SECONDARY SCHOOL	County	Mixed
17356101	MERTI SECONDARY SCHOOL	County	Boys
17356102	MERTI MUSLIM GIRLS’ SECONDARY SCHOOL	County	Girls
17356203	BULESA SECONDARY SCHOOL	County	Mixed

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