Sub county schools are the lowest cadre of secondary schools in Kenya. They are mostly made up of small mixed day schools, although there are well-established girls or boys only boarding sub-county schools across the country. The list below consists of names, KNEC Codes, Category and Types of sub county schools in Tana River County.
| School Code & Name | Category | Type |
| 05103104 Ndura Secondary School | Sub County | Mixed |
| 05103105 Daku Mixed Secondary School | Sub County | Mixed |
| 05103107 Majengo Secondary School | Sub County | Mixed |
| 05103109 Waldena Secondary School | Sub County | Mixed |
| 05112103 Marifano Secondary School | Sub County | Mixed |
| 05112204 Gadeni Secondary School | Sub County | Mixed |
| 05112205 Garsen High School | Sub County | Mixed |
| 05112206 Buyani Secondary School | Sub County | Mixed |
| 05112207 Mapunga High School | Sub County | Mixed |
| 05112208 Oda Secondary School | Sub County | Mixed |
| 05112209 Kitere Secondary School | Sub County | Mixed |
| 05112210 Minhaj Secondary School | Sub County | Mixed |
| 05117102 Huruma Mixed Day Secondary School | Sub County | Mixed |
| 05117103 Nanighi Tana Mixed Secondary School | Sub County | Mixed |
| 05117104 Singwaya Mixed Secondary School | Sub County | Mixed |
| 05117204 Mororo Mixed Day Secondary School | Sub County | Mixed |
| 05117205 Madogo Muslim High School | Sub County | Boys |
| 05117301 Bangale Mixed Day And Boarding Secondary School | Sub County | Mixed |
| 05117302 Kora Secondary School | Sub County | Mixed |
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