County secondary schools in Kenya form the third tier after national and extra-county schools respectively.
Most of Kenyan learners are absorbed by these schools.
Admission to county schools is done online by the Ministry of Education.
They are either mixed or single-sex.
Here is a list of county secondary schools in Makueni County:
| NAME | KNEC CODE | TYPE | CATEGORY | |
| 1 | ST. LAWRENCE’S NZIU GIRLS | 18307104 | Girls | County |
| 2 | ST JOHNS MALIVANI SECONDARY SCHOOL | 18307106 | Mixed | County |
| 3 | UKIA GIRLS’ SECONDARY SCHOOL | 18307202 | Girls | County |
| 4 | ST. PAUL’S KYAMUTHEI SECONDARY SCHOOL | 18307204 | Boys | County |
| 5 | NZEVENI SECONDARY SCHOOL | 18323103 | Mixed | County |
| 6 | KIKIMA SECONDARY SCHOOL | 18323105 | Mixed | County |
| 7 | MBOONI A.I.C GIRLS SECONDARY SCHOOL | 18323109 | Girls | County |
| 8 | UTANGWA HIGH SCHOOL | 18323201 | Mixed | County |
| 9 | UTANGWA GIRLS’ SECONDARY SCHOOL | 18323205 | Girls | County |
| 10 | ITETANI SECONDARY SCHOOL | 18323301 | Boys | County |
| 11 | KIATINENI SECONDARY SCHOOL | 18323302 | Mixed | County |
| 12 | MULOONI SECONDARY SCHOOL | 18323304 | Mixed | County |
| 13 | IMALE SCHOOL | 18323311 | Boys | County |
| 14 | KIKUMINI SECONDARY SCHOOL | 18324101 | Mixed | County |
| 15 | GOOD SHEPHERD GIRLS SECONDARY SCHOOL | 18324103 | Girls | County |
| 16 | UTINI GIRLS SECONDARY SCHOOL | 18324113 | Girls | County |
| 17 | MULALA GIRLS’ HIGH SCHOOL | 18324201 | Girls | County |
| 18 | MUTANDA GIRLS SECONDARY SCHOOL | 18324225 | Girls | County |
| 19 | GIGIRI LIONS GIRLS’ SECONDARY SCHOOL | 18324303 | Girls | County |
| 20 | GIGIRI NZEENI LIONS BOYS SECONDARY SCHOOL | 18324304 | Boys | County |
| 21 | JOANNA CHASE SECONDARY SCHOOL | 18325101 | Boys | County |
| 22 | MUTHINGIINI HIGH SCHOOL | 18325102 | Mixed | County |
| 23 | DARAJANI SECONDARY SCHOOL | 18325103 | Mixed | County |
| 24 | KITHINGIISYO SECONDARY SCHOOL | 18325104 | Mixed | County |
| 25 | ST. MARY’S KOMBOYOO GIRLS SECONDARY SCHOOL | 18325109 | Girls | County |
| 26 | KASUE GIRLS’ SECONDARY SCHOOL | 18325117 | Girls | County |
| 27 | ST. MARY’S GIRLS HIGH SCHOOL KINYAMBU | 18325203 | Girls | County |
| 28 | KISAYANI SECONDARY SCHOOL | 18325205 | Mixed | County |
| 29 | KYANGINYWA HIGH SCHOOL | 18325206 | Mixed | County |
| 30 | KATHYAKA SECONDARY SCHOOL | 18325207 | Mixed | County |
| 31 | UTITHI SECONDARY SCHOOL | 18325301 | Mixed | County |
| 32 | SUMBI SECONDARY SCHOOL | 18325303 | Mixed | County |
| 33 | KIVUTHINI SECONDARY SCHOOL | 18325307 | Mixed | County |
| 34 | KITHYULULU SECONDARY SCHOOL | 18325309 | Mixed | County |
| 35 | KATHONZWENI GIRLS SECONDARY SCHOOL | 18335208 | Girls | County |
| 36 | AIC MAVINDINI BOYS SECONDARY SCHOOL | 18335301 | Mixed | County |
| 37 | ST. JUDE GIRLS SECONDARY SCHOOL | 18335308 | Girls | County |
| 38 | KIANGINI SECONDARY SCHOOL | 18335401 | Girls | County |
| 39 | THOMEANDU SECONDARY SCHOOL | 18336102 | Boys | County |
| 40 | KILUNGU BOYS HIGH SCHOOL | 18336103 | Boys | County |
| 41 | ST.LUCIA GIRLS’ HIGH SCHOOL- KAUTI | 18336104 | Girls | County |
| 42 | INYOKONI SECONDARY SCHOOL | 18336106 | Mixed | County |
| 43 | NDOLO SECONDARY SCHOOL | 18336202 | Mixed | County |
| 44 | KITETA BOYS SECONDARY SCHOOL | 18346103 | Boys | County |
| 45 | KITETA GIRLS SECONDARY SCHOOL | 18346104 | Girls | County |
| 46 | NDULUKU SECONDARY SCHOOL | 18346106 | Boys | County |
| 47 | KAKO SECONDARY SCHOOL | 18346123 | Mixed | County |
| 48 | KITOTO SECONDARY SCHOOL | 18346201 | Mixed | County |
| 49 | ITITU SECONDARY SCHOOL | 18346202 | Girls | County |
| 50 | KALAWA GIRLS’ SECONDARY SCHOOL | 18346212 | Girls | County |
| 51 | KASIKEU GIRLS HIGH SCHOOL | 18347402 | Girls | County |
| 52 | ENGULI ABC SECONDARY SCHOOL | 18347403 | Mixed | County |
| 53 | MBIINI SECONDARY SCHOOL | 18347410 | Boys | County |
| 54 | NDULUNI SECONDARY SCHOOL | 18347412 | Mixed | County |
| 55 | MUKAA GIRLS’ HIGH SCHOOL | 18347504 | Girls | County |
| 56 | KITAINGO BOYS’ SECONDARY SCHOOL | 18347505 | Boys | County |
| 57 | ABC MAIANI BOYS HIGH SCHOOL | 18347506 | Boys | County |
| 58 | MT. CARMEL GIRLS’ SECONDARY SCHOOL – KILOME | 18347508 | Girls | County |
| 59 | KIONGWANI GIRLS SECONDARY SCHOOL | 18347512 | Girls | County |
| 60 | KIONGWANI BOYS HIGH SCHOOL | 18347513 | Boys | County |
| 61 | SALVATION ARMY MAIANI SECONDARY SCHOOL | 18347522 | Mixed | County |
| 62 | IKUNGU SECONDARY SCHOOL | 18348102 | Girls | County |
| 63 | SHINE STAR KAI SECONDARY SCHOOL | 18348103 | Mixed | County |
| 64 | ST. ANNS KIBOKO SECONDARY SCHOOL | 18348110 | Girls | County |
| 65 | NGUUMO GIRLS SECONDARY SCHOOL | 18348120 | Girls | County |