| Kindani Mixed Secondary School | Day | Mixed |
| King’O Mixed Day Secondary School | Day | Mixed |
| Kinjo Mixed Day Secondary School | Day | Mixed |
| Kinoro Mixed Day Secondary School | Day | Mixed |
| Kinoru Day Mixed Secondary School | Day | Mixed |
| Kionyo Secondary School | Day | Mixed |
| Kiorimba Mixed Day Secondary School | Day | Mixed |
| Kiria Mixed Day Secondary School | Day | Mixed |
| Kirigara Day Mixed Secondary School | Day | Mixed |
| Kirige Day Secondary School | Day | Mixed |
| Kirima Mixed Day Sec | Day | Mixed |
| Kirindara Mixed Day Secondary School | Day | Mixed |
| Kirindine Secondary School | Day | Mixed |
| Kirirwa Mixed Day Secondary School | Day | Mixed |
| Kirukire Day Mixed Secondary School | Day | Mixed |
| Kithakanaro Mixed Day Secondary School | Day | Mixed |
| Kithare Day Secondary School | Day | Mixed |
| Kithetu Kirimene Mixed Day Secondary School | Day | Mixed |
| Kithetu Secondary School | Day | Mixed |
| Kithiiri Mixed Day Secondary School | Day | Mixed |
| Kithirune Mixed Day Secondary School | Day | Mixed |
| Kithithina Mixed Secondary School | Day | Mixed |
| Kithunguri Secondary School | Day | Mixed |
| Kiune Mixed Day Secondary School | Day | Mixed |
| Kk Tharaine Day Secondary | Day | Mixed |
| Kongo Kamau Mixed Day Secondary School | Day | Mixed |
| Kothine Mixed Day Secondary School | Day | Mixed |
| Kunene Mixed Day Secondary School | Day | Mixed |
| Laciathuriu Secondary School | Day | Mixed |
| Laibocha Sec | Day | Mixed |
| Lailuba Day Sec Sch | Day | Mixed |
| Lairang’I Mixed Day Secondary School | Day | Mixed |
| Leeta Day Secondary School | Day | Mixed |
| Linjoka Day Secondary School | Day | Mixed |
| Lower Chure Day Secondary School | Day | Mixed |
| Lubuathirua | Day | Mixed |
| Lubunu Secondary School | Day | Mixed |
| Lukununu Mixed Secondary School | Day | Mixed |
| Luluma Mixed Day Secondary School | Day | Mixed |
| Mabuurua Mixed Day Sec | Day | Mixed |
| Machaku Day Secondary School | Day | Mixed |
| Machegene Mixed Secondary School | Day | Mixed |
| Machungulu Secondary School | Day | Mixed |
| Makandi Mixed Day Secondary School | Day | Mixed |
| Marega Mixed Day Secondary School | Day | Mixed |
| Mariene Mixed Day School | Day | Mixed |
| Marinya-A-Ruibi Secondary School | Day | Mixed |
| Mariri Secondary School | Day | Mixed |
| Maritati Day Secondary School | Day | Mixed |
| Matiandui Secondary School | Day | Mixed |
| Matirine Mixed Day Secondary School | Day | Mixed |
| Maua Mixed Day Secondary School | Day | Mixed |
| Mbaine Mixed Day Secondary School | Day | Mixed |
| Mbayo Day Secondary School | Day | Mixed |
| Mbirikene Mixed Secondary School | Day | Mixed |
| Mboone Day Secondary School | Day | Mixed |
| Mburanjiru Mixed Day Secondary School | Day | Mixed |
| Mburugiti Mixed Day Secondary School | Day | Mixed |
| Mbwinjeru Day Secondary School | Day | Mixed |
| Mck Kaathi Bukwang Day Mixed Secondary School | Day | Mixed |
| Mck Kamboo Mixed Day Secondary School | Day | Mixed |
| Mck Luuma | Day | Mixed |
| Mck Nthamiri Mixed Day Secondary School | Day | Mixed |
| Mck Ntiba Mixed Day Secondary School | Day | Mixed |
| Menwe Mixed Day Secondary School | Day | Mixed |
| Meru Muslim Secondary School | Day | Mixed |
| Mfariji Girls Secondary School | Day | Girls |
| Miathene Mixed Secondary School | Day | Mixed |
| Michogomone Secondary School | Day | Mixed |
| Miori Mixed Day Secondary School | Day | Mixed |
| Miriki Mixed Day Secondary School | Day | Mixed |
| Mitoone Mixed Day Secondary School | Day | Mixed |
| Mituntu Mixed Day Secondary School | Day | Mixed |
| Miuine Mixed Day Secondary School | Day | Mixed |
| Miurine Mixed Day Secondary School | Day | Mixed |
| Mpuri Mixed Day Secondary School | Day | Mixed |
| Muciimukuru Mixed Day Secondary School | Day | Mixed |
| Mucuune Mixed Day Secondary School | Day | Mixed |
| Mugae Hill Mixed Day Secondary School | Day | Mixed |
| Mugambone Secondary School | Day | Mixed |
| Mukaragatine Secondary School | Day | Mixed |
| Mukono Mixed Day Secondary School | Day | Mixed |
| Mukululu Day Secondary School | Day | Mixed |
| Mukuune Mixed Day Secondary School | Day | Mixed |
| Mulathankari Day Secondary School | Day | Mixed |
| Munithu Secondary School | Day | Girls |
| Murathi Secondary School | Day | Mixed |
| Murembu Day & Boarding Secondary School | Day | Mixed |
| Murera Secondary School | Day | Mixed |
| Muri Mixed Day Secondary School | Day | Mixed |
| Muringene Day Secondary School | Day | Mixed |
| Murinya Day Secondary School | Day | Mixed |
| Muromutua Mixed Secondry School | Day | Mixed |
| Muruugi Mixed Day Secondary School | Day | Mixed |
| Mutewa Day Secondary School | Day | Mixed |
| Muthangene Day Secondary School | Day | Mixed |
| Muthara Day Secondary | Day | Mixed |
| Muthionjuri Day Secondary School | Day | Mixed |
| Mutunguru Secondary School | Day | Mixed |
| Mutuuma Day Secondary School | Day | Mixed |