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 Trans Nzoia County:
| KNEC CODE AND NAME OF THE SCHOOL | TYPE | CATEGORY | |
| 1 | 23503116 ST COLUMBAN’S SECONDARY SCHOOL | Mixed | Sub County |
| 2 | 23503118 MATISI FRIENDS HIGH SCHOOL | Mixed | Sub County |
| 3 | 23503120 ST. MICHAEL SECONDARY SCHOOL KITALE | Mixed | Sub County |
| 4 | 23503135 TRANSNZOIA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 5 | 23503137 MASINDE MULIRO MEMORIAL SECONDARY | Mixed | Sub County |
| 6 | 23503142 TUWAN GIRLS DAY SECONDARY SCHOOL | Girls | Sub County |
| 7 | 23503143 ST.PHILIP’S GRASSLAND SECONDARY SCHOOL | Mixed | Sub County |
| 8 | 23503156 RAFIKI SECONDARY SCHOOL | Mixed | Sub County |
| 9 | 23503161 SOIL CONSERVATION SECONDARY SCHOOL | Mixed | Sub County |
| 10 | 23503162 KITALE FARM SECONDARY SCHOOL | Mixed | Sub County |
| 11 | 23503303 SIKINWA SECONDARY SCHOOL | Mixed | Sub County |
| 12 | 23503304 NAKAMI FRIENDS SECONDARY SCHOOL | Mixed | Sub County |
| 13 | 23503305 ST. PARTRICK’S SCHOOL KOYKOY | Mixed | Sub County |
| 14 | 23503306 ST. THOMAS AQUINAS SECONDARY SCHOOL KAPRETWA | Mixed | Sub County |
| 15 | 23503307 FRIENDS SECONDARY SCHOOL-MUROKI | Mixed | Sub County |
| 16 | 23503308 ST. PHILIPS A.C.K TUUYO-KOONY SECONDARY SCHOOL | Mixed | Sub County |
| 17 | 23503311 ST. ATHANAS KISSAWAI SECONDARY SCHOOL | Mixed | Sub County |
| 18 | 23503312 BISHOP CROWLEY SECONDARY SCHOOL | Mixed | Sub County |
| 19 | 23503313 SENATOR WAMALWA SECONDARY SCHOOL | Mixed | Sub County |
| 20 | 23503314 ST. BENEDICT’S SECONDARY SCHOOL CHEMCHEMI | Mixed | Sub County |
| 21 | 23503315 ST. AUGUSTINE BONDENI SECONDARY SCHOOL | Mixed | Sub County |
| 22 | 23503317 LUANDA SECONDARY SCHOOL | Mixed | Sub County |
| 23 | 23503319 GITUAMBA SECONDARY SCHOOL | Mixed | Sub County |
| 24 | 23503321 SIKULU SECONDARY SCHOOL | Mixed | Sub County |
| 25 | 23503322 FRIENDS DAY SECONDARY SCHOOL-LUKHOME | Mixed | Sub County |
| 26 | 23503323 CHEPKOILEL SECONDARY SCHOOL | Mixed | Sub County |
| 27 | 23503324 ST.LUCIA GIRLS SECONDARY SCHOOL | Girls | Sub County |
| 28 | 23503325 ST.VERONICAS CHEBUKAKA SECONDARY SCHOOL | Mixed | Sub County |
| 29 | 23503326 CHEPTUMBELIO SECONDARY SCHOOL-KALAHA | Mixed | Sub County |
| 30 | 23503327 SANGO SECONDARY SCHOOL | Mixed | Sub County |
| 31 | 23503328 ST. ANTHONY SECONDARY SCHOOL KINYORO | Mixed | Sub County |
| 32 | 23503329 ST. ANDREWS SECONDARY SCHOOL SUKWO | Mixed | Sub County |
| 33 | 23503330 TELDET MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 34 | 23503331 ST. PETERS SECONDARY SCHOOL MWITHA | Mixed | Sub County |
| 35 | 23503332 LUKOSI S.A SECONDARY SCHOOL | Mixed | Sub County |
| 36 | 23528102 SITATUNGA SECONDARY SCHOOL | Mixed | Sub County |
| 37 | 23528110 ST PETER’S NYAKINYWA MIXED DAY SECONDARY SCHOOL | Mixed | Sub County |
| 38 | 23528111 KESOGON MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 39 | 23528112 ST. TERESA’S MIXED SECONDARY-SINYERERI | Mixed | Sub County |
| 40 | 23528113 CHISARE SECONDARY SCHOOL | Mixed | Sub County |
| 41 | 23528114 ST THOMAS SECONDARY SCHOOL – KONGOLI | Girls | Sub County |
| 42 | 23528115 KIMOSON SECONDARY SCHOOL | Mixed | Sub County |
| 43 | 23528117 YUYA SECONDARY SCHOOL | Mixed | Sub County |
| 44 | 23528118 ST. AUGUSTINE SECONDARY SCHOOL – MUNYAKA | Mixed | Sub County |
| 45 | 23528119 ST.MICHAEL’S SECONDARY SCHOOL | Mixed | Sub County |
| 46 | 23528120 CHEMATICH SECONDARY SCHOOL. | Mixed | Sub County |
| 47 | 23528121 SIBANGA SECONDARY SCHOOL | Mixed | Sub County |
| 48 | 23528122 MAKUTANO SECONDARY SCHOOL | Mixed | Sub County |
| 49 | 23528123 ST. CHARLES LWANGA SECONDARY SCHOOL-BOTWA | Mixed | Sub County |
| 50 | 23528125 ST. PAUL’S KIRIITA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 51 | 23528126 AIC NGONYEK SECONDARY SCHOOL | Mixed | Sub County |
| 52 | 23528127 MATEKET SECONDARY SCHOOL | Mixed | Sub County |
| 53 | 23528128 NZOIA CENTRE SECONDARY SCHOOL | Mixed | Sub County |
| 54 | 23528129 MILIMA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 55 | 23528130 ST. PATRICK HIGH SCHOOL – KIPSAINA | Mixed | Sub County |
| 56 | 23528131 ST. LUKES SECONDARY SCHOOL TAITO | Mixed | Sub County |
| 57 | 23528132 ST.MARY’S SECONDARY SCHOOL – KIPSINGORI | Mixed | Sub County |
| 58 | 23528134 ST CHRISTOPHER’S GIRLS SECONDARY SCHOOL | Girls | Sub County |
| 59 | 23528136 MOTOSIET SECONDARY SCHOOL | Mixed | Sub County |
| 60 | 23528138 AMANI SECONDARY SCHOOL | Mixed | Sub County |
| 61 | 23528139 BISHOP CROWLEY HIGH SCHOOL-BARAKA | Mixed | Sub County |
| 62 | 23528140 IMMACULATE CONCEPTION HIGH SCHOOL-KEMELOI | Mixed | Sub County |
| 63 | 23528141 ST. PHILIPS SECONDARY SCHOOL-SURUNGAI | Mixed | Sub County |
| 64 | 23528142 OUR LADY OF AFRICA CHEPKOIYO SECONDARY SCHOOL | Mixed | Sub County |
| 65 | 23528143 KARARA SECONDARY SCHOOL | Mixed | Sub County |
| 66 | 23528144 EKEGORO SECONDARY SCHOOL | Mixed | Sub County |
| 67 | 23528145 SAIWA SECONDARY SCHOOL | Mixed | Sub County |
| 68 | 23528146 FRIENDS MICHAI SECONDARY SCHOOL | Mixed | Sub County |
| 69 | 23528148 A.I.C NYASALAND SECONDARY SCHOOL | Mixed | Sub County |
| 70 | 23528202 KAPCHEPLANGET SECONDARY SCHOOL | Mixed | Sub County |
| 71 | 23528203 GETA SECONDARY SCHOOL | Mixed | Sub County |
| 72 | 23528205 KAPKARWA SECONDARY SCHOOL | Mixed | Sub County |
| 73 | 23528207 ST.ANDREWS OSORONGAI SECONDARY SCHOOL | Boys | Sub County |
| 74 | 23528209 A.I.C KIPTENDEN SECONDARY SCHOOL | Mixed | Sub County |
| 75 | 23528210 AIC BIRIBIRIET SECONDARY SCHOOL | Mixed | Sub County |
| 76 | 23528211 ST. JOSEPH’S CHEPTIL SECONDARY SCHOOL | Mixed | Sub County |
| 77 | 23528212 AIC SEUM MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 78 | 23528213 FRIENDS SECONDARY SCHOOL – BONDE | Mixed | Sub County |
| 79 | 23528215 ST.PAULS KIPTOROR SECONDARY SCHOOL | Mixed | Sub County |
| 80 | 23528217 A.I.C TUIGOINS SECONDARY SCHOOL | Mixed | Sub County |
| 81 | 23528218 BENON SECONDARY SCHOOL | Mixed | Sub County |
| 82 | 23528219 NOIGAM SECONDARY SCHOOL | Mixed | Sub County |
| 83 | 23528220 KAPSIROWA SECONDARY SCHOOL | Mixed | Sub County |
| 84 | 23528221 A.I.C CHEPSIRO SECONDARY SCHOOL | Mixed | Sub County |
| 85 | 23528222 ST PAUL’S KAPCHEPSIR SECONDARY SCHOOL | Mixed | Sub County |
| 86 | 23528223 AIC TOP SUWERWA MIXED DAY SECONDARY SCHOOL | Mixed | Sub County |
| 87 | 23528224 UPEC OSORONGAI GIRLS HIGH SCHOOL | Girls | Sub County |
| 88 | 23528226 ST MARYS MIXED CHEPTOBOT SECONDARY SCHOOL | Mixed | Sub County |
| 89 | 23528227 SDA MOIGE HIGH SCHOOL | Mixed | Sub County |
| 90 | 23529107 ST. PETER`S HIGH SCHOOL-KAPOMBOI | Mixed | Sub County |
| 91 | 23529109 ST.PAUL’S-BWAYI MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 92 | 23529111 LUUYA SECONDARY SCHOOL | Mixed | Sub County |
| 93 | 23529112 ST.THOMAS AMUKA SECONDARY SCHOOL | Mixed | Sub County |
| 94 | 23529115 MILIMANI SECONDARY SCHOOL – KWANZA | Mixed | Sub County |
| 95 | 23529116 A I C KAPSITWET SECONDARY SCHOOL | Mixed | Sub County |
| 96 | 23529117 MARIDADI SECONDARY SCHOOL | Mixed | Sub County |
| 97 | 23529119 KEESE SECONDARY SCHOOL | Mixed | Sub County |
| 98 | 23529121 BIKETI FRIENDS SECONDARY SCHOOL | Mixed | Sub County |
| 99 | 23529123 ST CECILIA SECONDARY SCHOOL MARINDA | Mixed | Sub County |
| 100 | 23529124 KOROSIOT HIGH SCHOOL | Mixed | Sub County |
| 101 | 23529125 ST. JOHN’S MIXED SECONDARY SCHOOL – SARURA | Mixed | Sub County |
| 102 | 23529127 NASIANDA FRIENDS SECONDARY SCHOOL | Mixed | Sub County |
| 103 | 23529128 SOYMINING SECONDARY SCHOOL | Mixed | Sub County |
| 104 | 23529129 MUTUA SECONDARY SCHOOL | Mixed | Sub County |
| 105 | 23529133 A.I.C LESSOS SECONDARY SCHOOL | Mixed | Sub County |
| 106 | 23529136 A.I.C KIPTUMET SECONDARY SCHOOL | Mixed | Sub County |
| 107 | 23529137 KARAUS SECONDARY SCHOOL | Mixed | Sub County |
| 108 | 23529139 MISANGA S.A HIGH SCHOOL | Mixed | Sub County |
| 109 | 23529140 ST.ANNE UMOJA GIRLS SECONDARY SCHOOL | Girls | Sub County |
| 110 | 23529142 ST. MARTINS SECONDARY SCHOOL – MAKHONGE | Mixed | Sub County |
| 111 | 23529143 ST. AUGUSTINE MAZIWA SECONDARY SCHOOL | Mixed | Sub County |
| 112 | 23529144 ACK ST.PHILIP KIPSOEN SECONDARY SCHOOL | Mixed | Sub County |
| 113 | 23529145 KAPKOI CENTRAL GIRLS HIGH SCHOOL | Girls | Sub County |
| 114 | 23529146 METEITEI SECONDARY SCHOOL | Mixed | Sub County |
| 115 | 23529147 MUKUYUNI SECONDARY SCHOOL | Mixed | Sub County |
| 116 | 23529148 NGENY SECONDARY SCHOOL | Mixed | Sub County |
| 117 | 23529149 ST. EMMANUEL SECONDARY SCHOOL | Mixed | Sub County |
| 118 | 23529151 GIDEA BOYS SECONDARY SCHOOL | Boys | Sub County |
| 119 | 23529152 AIC KAPKAI SECONDARY SCHOOL | Mixed | Sub County |
| 120 | 23529153 AIC MWANGAZA SECONDARY SCHOOL | Mixed | Sub County |
| 121 | 23572103 MUBERE SECONDARY SCHOOL | Mixed | Sub County |
| 122 | 23572104 ST MATHEWS SECONDARY SCHOOL (CHEPTANTAN) | Mixed | Sub County |
| 123 | 23572105 MATUMBEI SECONDARY SCHOOL | Mixed | Sub County |
| 124 | 23572106 BWALA SECONDARY SCHOOL | Mixed | Sub County |
| 125 | 23572107 ST.VERONICA’S GIRLS HIGH SCHOOL – KOKWO | Girls | Sub County |
| 126 | 23572108 ST. BARNABAS BOYS SECONDARY SCHOOL – SABWANI | Boys | Sub County |
| 127 | 23572201 ST.MARY’S NAI BOYS SECONDARY SCHOOL | Mixed | Sub County |
| 128 | 23572202 KIMWONDO SECONDARY SCHOOL | Mixed | Sub County |
| 129 | 23572203 JAPATA HIGH SCHOOL | Mixed | Sub County |
| 130 | 23572204 NJORO SECONDARY SCHOOL | Mixed | Sub County |
| 131 | 23572205 ANDERSEN HIGH SCHOOL | Mixed | Sub County |
| 132 | 23572206 ST. MARY’S NAI GIRLS SECONDARY SCHOOL | Girls | Sub County |
| 133 | 23572207 ST. FRANCIS OF ASIS KORONGA SECONDARY SCHOOL | Mixed | Sub County |
| 134 | 23572209 NALULINGO SECONDARY SCHOOL | Mixed | Sub County |
| 135 | 23574102 THE MICHAEL KIJANA MEMORIAL SECONDARY SCHOOL | Mixed | Sub County |
| 136 | 23574103 MILIMANI SECONDARY SCHOOL | Mixed | Sub County |
| 137 | 23574107 KIBOMET SECONDARY SCHOOL | Mixed | Sub County |
| 138 | 23574108 SANEC APBET EDUCATION CENTRE | Mixed | Sub County |
| 139 | 23574109 ST.TERESA’S SECONDARY SCHOOL BIKEKE | Mixed | Sub County |
| 140 | 23574110 FRIEND’S SECONDARY SCHOOL – SIRENDE | Mixed | Sub County |
| 141 | 23574111 ST. JOHN’S GIRLS HIGH SCHOOL – SIRENDE | Girls | Sub County |
| 142 | 23574112 MACHUNGWA HIGH SCHOOL | Mixed | Sub County |
| 143 | 23574114 FRIENDS SECONDARY SCHOOL – BIKEKE | Mixed | Sub County |
| 144 | 23574115 MAINEK TORO SECONDARY SCHOOL | Mixed | Sub County |
| 145 | 23574117 ST. JAMES AMAGORO SECONDARY SCHOOL | Mixed | Sub County |
| 146 | 23574118 AIC KAPTIEN SECONDARY SCHOOL | Mixed | Sub County |
| 147 | 23574119 A.I.C KAPKOI SISAL SECONDARY SCHOOL | Mixed | Sub County |
| 148 | 23574120 EMMANUEL ACK WEHOYA SECONDARY SCHOOL | Mixed | Sub County |
| 149 | 23574121 MITONI MITATU SECONDARY SCHOOL | Mixed | Sub County |
| 150 | 23574122 ST. JAMES MABONDE SECONDARY SCHOOL | Mixed | Sub County |
| 151 | 23574124 ST. RAPHAEL BIG TREE SECONDARY SCHOOL | Mixed | Sub County |
| 152 | 23574125 ST. JOSEPH’S ACK KIBAGENGE SECONDARY SCHOOL | Mixed | Sub County |
| 153 | 23574126 A.I.C MOKOIYWET SECONDARY SCHOOL | Mixed | Sub County |
| 154 | 23574127 A.I.C LOLKERINGET SECONDARY SCHOOL | Mixed | Sub County |
| 155 | 23574128 ST. PATRICK’S BOYS HIGH SCHOOL WAITALUK | Boys | Sub County |
| 156 | 23574130 MASABA SECONDARY SCHOOL | Mixed | Sub County |
| 157 | 23574131 ST.VINCENT SECONDARY SCHOOL KIMININI | Mixed | Sub County |
| 158 | 23574132 ST. JOHN’S NYAMIRA SECONDARY SCHOOL | Mixed | Sub County |
| 159 | 23574133 MITOTO S.A SECONDARY SCHOOL | Mixed | Sub County |
| 160 | 23574134 ST. JOSEPH’S SECONDARY SCHOOL NYASI | Mixed | Sub County |
| 161 | 23574135 AIC KONOIN SECONDARY SCHOOL | Mixed | Sub County |
| 162 | 23574136 MUCHARAGE SECONDARY SCHOOL | Mixed | Sub County |
| 163 | 23574137 MUUNGANO HIGH SCHOOL | Mixed | Sub County |
| 164 | 23574138 ST. MICHAEL KIKWAMETI SECONDARY SCHOOL | Mixed | Sub County |
| 165 | 23574139 FRIENDS MUFUTU SECONDARY SCHOOL | Mixed | Sub County |
| 166 | 23574141 ST.THERESA`S SECONDARY SCHOOL-SIKHENDU | Mixed | Sub County |
| 167 | 23574142 NABUNGA S.A. SECONDARY SCHOOL | Mixed | Sub County |
| 168 | 23574144 KIUNGANI SECONDARY SCHOOL | Mixed | Sub County |
| 169 | 23574145 HILARIO SECONDARY SCHOOL – WEKHONYE | Mixed | Sub County |
| 170 | 23574146 ST.ANDREWS GIRLS BARATON SECONDARY | Girls | Sub County |
| 171 | 23574149 BIRUNDA HIGH SCHOOL | Mixed | Sub County |
| 172 | 23574151 IMANI FRIENDS SECONDARY SCHOOL | Mixed | Sub County |
| 173 | 23574152 FRIENDS SECONDARY SCHOOL -CHALICHA | Mixed | Sub County |
| 174 | 23574153 MESO SECONDARY SCHOOL | Mixed | Sub County |
| 175 | 23574154 NABISWA SECONDARY SCHOOL | Mixed | Sub County |
| 176 | 23574155 ST. THOMAS AQUINAS SECONDARY SCHOOL-NAMGOI | Mixed | Sub County |
| 177 | 23574156 A.I.C NAISAMBU GIRLS SECONDARY SCHOOL | Girls | Sub County |
| 178 | 23574157 WAMUINI SECONDARY SCHOOL | Mixed | Sub County |
| 179 | 23574158 HILL SCHOOL SECONDARY KITALE | Mixed | Sub County |
| 180 | 23574159 MISEMWA SECONDARY SCHOOL | Mixed | Sub County |
| 181 | 23574160 MILELE SECONDARY SCHOOL | Mixed | Sub County |
| 182 | 23574161 SABATA SECONDARY SCHOOL | Mixed | Sub County |
| 183 | 23574162 ACK ST. STEPHENS NAMANDA SECONDARY SCHOOL | Mixed | Sub County |
| 184 | 23574163 KA – AHUHO SECONDARY SCHOOL | Mixed | Sub County |