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 Nyeri County:
| School Code | School Name | Category | Type |
| 08202008 | MUTHUAINI SECONDARY SCHOOL | County | Girls |
| 08202011 | GACHIKA SECONDARY SCHOOL | County | Mixed |
| 08210202 | ST. MONICA MUNYAKA GIRLS SECONDARY SCHOOL | County | Girls |
| 08210301 | NDATHI SECONDARY SCHOOL | County | Boys |
| 08217102 | GATONDO SECONDARY SCHOOL | County | Girls |
| 08217103 | KIARITHA-INI HIGH SCHOOL | County | Boys |
| 08217104 | GIAKAIBII SECONDARY SCHOOL | County | Boys |
| 08217201 | KARATINA SECONDARY SCHOOL | County | Girls |
| 08217204 | MAGUTU GIRLS’ SECONDARY SCHOOL | County | Girls |
| 08217205 | MATHAITHI SECONDARY SCHOOL | County | Girls |
| 08218104 | ICUGA SECONDARY SCHOOL | County | Girls |
| 08218201 | RUTHAGATI HIGH SCHOOL | County | Boys |
| 08218203 | KABIRUINI SECONDARY SCHOOL | County | Girls |
| 08218204 | HIRIGA SECONDARY SCHOOL | County | Girls |
| 08218207 | KIAMARIGA SECONDARY SCHOOL | County | Boys |
| 08219104 | TAMBAYA SECONDARY SCHOOL | County | Mixed |
| 08219105 | ST.AUGUSTINE GIKONDI BOYS SECONDARY SCHOOL | County | Boys |
| 08219106 | GATHUNGURURU GIRLS SECONDARY SCHOOL | County | Girls |
| 08219107 | MWERU HIGH SCHOOL | County | Mixed |
| 08219108 | NDIAINI GIRLS’ HIGH SCHOOL | County | Girls |
| 08219109 | ST ANNE GITHUNGURI GIRLS | County | Girls |
| 08219126 | KARUNDU MIXED SECONDARY SCHOOL | County | Mixed |
| 08220104 | MWIYOGO SECONDARY SCHOOL | County | Mixed |
| 08220202 | WATUKA SECONDARY SCHOOL | County | Boys |
| 08220401 | MUGUNDA SECONDARY SCHOOL | County | Girls |
| 08221103 | DR. KAMUNDIA GATHUTHI GIRLS SECONDARY SCHOOL | County | Girls |
| 08221107 | WAMAGANA GIRLS SECONDARY SCHOOL | County | Girls |
| 08221205 | GATHATHI-INI SECONDARY SCHOOL | County | Girls |
| 08221206 | HUHO-INI GIRLS HIGH SCHOOL | County | Girls |
| 08221302 | AGUTHI SECONDARY SCHOOL | County | Mixed |
| 08237011 | GATUGI GIRLS SECONDARY SCHOOL | County | Girls |
| 08237016 | IRIA-INI GIRLS’ HIGH SCHOOL | County | Girls |
| 08237017 | KIHOME SECONDARY SCHOOL | County | Mixed |
| 08237018 | MUCHARAGE SECONDARY SCHOOL | County | Girls |
| 08237020 | KAGONYE SECONDARY SCHOOL | County | Mixed |
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