Sub-county schools in Kenya form the lowest cadre of secondary schools.
They come after national, extra county and county schools respectively.
Kenyan learners who attain low marks in the KCPE national exam are admitted to these schools.
Majority of sub-county schools are mixed.
Most of them are day schools though a few are day/boarding schools.
They are available across all the 47 counties.
Here is a list of sub-county secondary schools in Mandera County:
| KNEC CODE AND NAME | TYPE | CATEGORY | |
| 1 | 47810104 TAKABA DAY MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 2 | 47810107 DARWED MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 3 | 47811102 EL-HAGARSU MIXED DAY SECONDARY SCHOOL | Mixed | Sub County |
| 4 | 47811105 DARUL HIKMA DAY HIGH SCHOOL | Mixed | Sub County |
| 5 | 47811302 GOLOLBIA GIRLS SECONDARY SCHOOL | Girls | Sub County |
| 6 | 47811401 SHIMBIR FATUMA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 7 | 47812104 RHAMU DAY SECONDARY SCHOOL | Mixed | Sub County |
| 8 | 47812205 OLLA BOYS SECONDARY SCHOOL | Boys | Sub County |
| 9 | 47817102 BANISA MIXED SECONDARY | Mixed | Sub County |
| 10 | 47817105 BANISA GIRLS SECONDARY SCHOOL | Girls | Sub County |
| 11 | 47822102 BOREHOLE 11 SECONDARY SCHOOL | Mixed | Sub County |
| 12 | 47823101 KILIWEHIRI BOYS SECONDARY SCHOOL | Boys | Sub County |
