County schools are the second lowest cadre of secondary schools in Kenya. They are mostly made up of schools that are categorized at the county level and they admit students majorly from their counties. The list below consists of names, KNEC Codes, Category and Types of county schools in Kitui County.
| School KNEC Code | School Name | Category | Type Location | ||
| 13302104 | Tiva Secondary School | County | Mixed | Kitui | |
| 13302109 | Ivaini Secondary School | County | Mixed | Kitui | |
| 13302111 | St Mary’s Secondary School – Miambani | County | Mixed | Kitui | |
| 13310104 | Kaela Mixed Secondary School | County | Mixed | Kitui | |
| 13310202 | Enziu Secondary School | County | Mixed | Kitui | |
| 13310203 | Karunga Secondary School | County | Mixed | Kitui | |
| 13310301 | Kiio Secondary School | County | Mixed | Kitui | |
| 13310305 | Mbondoni Mixed Day Secondary School | County | Mixed | Kitui | |
| 13317102 | Ikanga Boys Secondary School | County | Boys | Kitui | |
| 13317103 | Kyatune Girls’ Secondary School | County | Girls | Kitui | |
| 13317104 | Mutomo Mixed Secondary School | County | Mixed | Kitui | |
| 13317105 | Ikanga Girls’ Secondary School | County | Girls | Kitui | |
| 13317107 | St.Patricks Mixed Secondary School | County | Mixed | Kitui | |
| 13317112 | Kyatune Boys’ High School | County | Boys | Kitui | |
| 13317302 | Voo Secondary School | County | Mixed | Kitui | |
| 13328103 | Kalonzo Secondary School | County | Mixed | Kitui | |
| 13328104 | Kimangao Boys Secondary School | County | Boys | Kitui | |
| 13328106 | Kyuso Girls Secondary School | County | Girls | Kitui | |
| 13328301 | Mivukoni Secondary School | County | Mixed | Kitui | |
| 13331206 | Musengo Secondary School | County | Mixed | Kitui | |
| 13331207 | Ilako Mututa Secondary School | County | Mixed | Kitui | |
| 13331208 | Mutini Secondary School | County | Mixed | Kitui | |
| 13331209 | Kasue Secondary School | County | Mixed | Kitui | |
| 13331211 | Katutu Girls’ Secondary School | County | Girls | Kitui | |
| 13331230 | A.I.C Mutonguni Girls Secondary School | County | Girls | Kitui | |
| 13332201 | Endau Secondary School | County | Mixed | Kitui | |
| 13338101 | Mui Secondary School | County | Boys | Kitui | |
| 13338102 | Kalitini Secondary School | County | Mixed | Kitui | |
| 13338103 | Kyamwenze Girls Secondary School | County | Girls | Kitui | |
| 13338201 | Nguni Secondary School | County | Boys | Kitui | |
| 13338203 | Masavi Girls’ Secondary School | County | Girls | Kitui | |
| 13338301 | Nuu Secondary School | County | Boys | Kitui | |
| 13338302 | Kaai Girls’ Secondary School | County | Girls | Kitui | |
| 13339104 | Ndaluni Secondary School | County | Mixed | Kitui | |
| 13339202 | Katoteni Secondary School | County | Mixed | Kitui | |
| 13339203 | Ngongoni Secondary School | County | Mixed | Kitui | |
| 13339302 | Nzeluni Boys Secondary School | County | Boys | Kitui | |
| 13344102 | St. Bridgit Syomunyu Girls Secondary School | County | Girls | Kitui | |
| 13344103 | St. Augustine Kanyangi Secondary School | County | Boys | Kitui | |
| 13344108 | Kanyangi Girls’ Secondary School | County | Girls | Kitui | |
| 13344121 | Lower Yatta Girls Secondary School-Nthilani | County | Girls | Kitui | |
| 13350201 | Nguuku Secondary School | County | Mixed | Kitui | |
| 13350202 | Katse Secondary School | County | Mixed | Kitui | |
| 13350204 | Tyaa Kamuthale Secondary School | County | Mixed | Kitui | |
| 13351301 | Kaluva Mixed Day Secondary School | County | Mixed | Kitui | |
| 13352101 | Tseikuru Secondary School | County | Mixed | Kitui | |
| 13352201 | Usueni Girls Secondary School | County | Girls | Kitui | |
| 13353101 | Katulani Secondary School | County | Boys | Kitui | |
| 13353302 | Kavisuni Mixed Secondary School | County | Mixed | Kitui | |
| 13353303 | Kathungi Secondary School | County | Mixed | Kitui | |
| 13354204 | Katwala Secondary School | County | Mixed | Kitui | |
| 13357104 | Kasaala Secondary School | County | Mixed | Kitui | |
| 13360102 | Kyaani Girls Secondary School | County | Girls | Kitui | |
| 13360103 | Kauma Secondary School | County | Boys | Kitui | |
| 13360104 | St.Johns Kwa Mulungu Secondary School | County | Mixed | Kitui | |
| 13360105 | Kalimani Secondary School | County | Mixed | Kitui | |
| 13360108 | Mutulu Secondary School | County | Mixed | Kitui | |
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