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 Siaya County:
| KNEC CODE AND NAME | TYPE | CATEGORY | |
| 1 | 42705101 HONO SECONDARY SCHOOL | Mixed | Sub County |
| 2 | 42705103 BORO MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 3 | 42705105 MBAGA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 4 | 42705106 OBAMBO MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 5 | 42705107 ST.JOSEPHS NYALULA SECONDARY SCHOOL | Mixed | Sub County |
| 6 | 42705108 SEGERE SECONDARY SCHOOL | Mixed | Sub County |
| 7 | 42705109 UYOMA KOBARE SECONDARY SCHOOL | Mixed | Sub County |
| 8 | 42705110 NYADHI SECONDARY SCHOOL | Mixed | Sub County |
| 9 | 42705111 GOT OYENGA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 10 | 42705112 KOWET SECONDARY SCHOOL | Mixed | Sub County |
| 11 | 42705113 ST. CHRISTOPHER PAL PAL SECONDARY SCHOOL | Mixed | Sub County |
| 12 | 42705114 ST. WILLIAM GENDRO SECONDARY SCHOOL | Mixed | Sub County |
| 13 | 42705205 AGORO OYOMBE SECONDARY SCHOOL | Mixed | Sub County |
| 14 | 42705207 AMBROSE ADEYA ADONGO SECONDARY SCHOOL | Mixed | Sub County |
| 15 | 42705209 SIAYA TOWNSHIP SECONDARY SCHOOL | Mixed | Sub County |
| 16 | 42705210 HOLYCROSS SECONDARY SCHOOL | Mixed | Sub County |
| 17 | 42705211 SENATOR OBAMA KOGELO SECONDARY SCHOOL | Mixed | Sub County |
| 18 | 42705212 MULAHA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 19 | 42705213 ULAFU SECONDARY SCHOOL | Mixed | Sub County |
| 20 | 42705214 NDURU MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 21 | 42705215 RAMBO SECONDARY SCHOOL | Mixed | Sub County |
| 22 | 42705216 NYAJUOK SECONDARY SCHOOL | Mixed | Sub County |
| 23 | 42705218 NGIYA MIXED DAY SECONDARY SCHOOL | Mixed | Sub County |
| 24 | 42705219 BAR OLENGO SECONDARY SCHOOL | Mixed | Sub County |
| 25 | 42705220 MATERA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 26 | 42705221 USULA SECONDARY SCHOOL | Mixed | Sub County |
| 27 | 42705222 KARAPUL SECONDARY SCHOOL | Mixed | Sub County |
| 28 | 42705223 OJWANDO SECONDARY SCHOOL | Mixed | Sub County |
| 29 | 42705224 ST STEPHEN’S USINGO MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 30 | 42705225 ST PETER’S UPANDA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 31 | 42705226 SIAYA CENTRAL SECONDARY SCHOOL | Mixed | Sub County |
| 32 | 42705301 MWER SECONDARY SCHOOL | Boys | Sub County |
| 33 | 42705303 NYAMBARE SECONDARY SCHOOL | Mixed | Sub County |
| 34 | 42705304 DIRK ALLISON GSM SECONDARY SCHOOL | Mixed | Sub County |
| 35 | 42705305 DIBUORO SECONDARY SCHOOL | Mixed | Sub County |
| 36 | 42705306 SIRINDE MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 37 | 42705307 MALOMBA SECONDARY SCHOOL | Mixed | Sub County |
| 38 | 42705308 KALKADA SECONDARY SCHOOL | Mixed | Sub County |
| 39 | 42705309 KABURA SECONDARY SCHOOL | Mixed | Sub County |
| 40 | 42705310 UWASI MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 41 | 42705311 SIDOK MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 42 | 42705312 MAHERO MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 43 | 42705313 FR.GULIK URADI GIRLS SECONDARY SCHOOL | Girls | Sub County |
| 44 | 42705314 UNYOLO MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 45 | 42705315 MAHOLA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 46 | 42705316 NYASITA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 47 | 42712105 GOBEI MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 48 | 42712107 KAPIYO SECONDARY SCHOOL | Mixed | Sub County |
| 49 | 42712108 NDIRA SECONDARY SCHOOL | Mixed | Sub County |
| 50 | 42712109 JARAMOGI OGINGA ODINGA SECONDARY SCHOOL | Mixed | Sub County |
| 51 | 42712110 BONDO TOWNSHIP SECONDARY SCHOOL | Mixed | Sub County |
| 52 | 42712111 AGWARA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 53 | 42712112 NYAWITA SECONDARY SCHOOL | Mixed | Sub County |
| 54 | 42712114 USIRE SECONDARY SCHOOL | Mixed | Sub County |
| 55 | 42712115 KAMNARA SECONDARY SCHOOL | Mixed | Sub County |
| 56 | 42712116 NYABENGE MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 57 | 42712202 AKOKO SECONDARY SCHOOL | Mixed | Sub County |
| 58 | 42712203 UYAWI SECONDARY SCHOOL | Mixed | Sub County |
| 59 | 42712205 GOT ABIERO SECONDARY SCHOOL | Mixed | Sub County |
| 60 | 42712206 ST. PAUL’S MITIRO MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 61 | 42712207 NYAGUDA SECONDARY SCHOOL | Mixed | Sub County |
| 62 | 42712209 ST. MARYS SECONDARY SCHOOL MARANYONA | Mixed | Sub County |
| 63 | 42712210 MBEKA GIRLS DAY SECONDARY SCHOOL | Girls | Sub County |
| 64 | 42712211 SERAWONGO MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 65 | 42712212 KIPASI SECONDARY SCHOOL | Mixed | Sub County |
| 66 | 42712213 ORENGO SECONDARY SCHOOL | Mixed | Sub County |
| 67 | 42712214 ST. LUKES WAMBARRA SECONDARY SCHOOLS | Mixed | Sub County |
| 68 | 42712305 MAJENGO MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 69 | 42712307 JUSA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 70 | 42712308 JOAKIM OWANG’ MAGETA SECONDARY SCHOOL | Mixed | Sub County |
| 71 | 42712309 GOT MATAR SECONDARY SCHOOL | Mixed | Sub County |
| 72 | 42712311 ST. MONICA MAGO MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 73 | 42712312 KANYIBOK MIXED DAY SECONDARY SCHOOL | Mixed | Sub County |
| 74 | 42712313 ULOWA GIRLS DAY SECONDARY SCHOOL | Girls | Sub County |
| 75 | 42721106 GAGRA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 76 | 42721107 NYAMASORE MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 77 | 42721108 OKELA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 78 | 42721109 NAYA SECONDARY SCHOOL | Mixed | Sub County |
| 79 | 42721110 RAMOGI ACHIENG’ ONEKO SECONDARY SCHOOL | Mixed | Sub County |
| 80 | 42721111 MIRANDO ONGALO SECONDARY SCHOOL | Mixed | Sub County |
| 81 | 42721112 MIGOWA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 82 | 42721113 MASALA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 83 | 42721114 RACHAR SECONDARY SCHOOL | Mixed | Sub County |
| 84 | 42721115 NYABERA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 85 | 42721116 TANGA SECONDARY SCHOOL | Mixed | Sub County |
| 86 | 42721117 LIETA SECONDARY SCHOOL | Mixed | Sub County |
| 87 | 42721118 ST.JOHANESS KAWUONDI SECONDARY SCHOOL | Mixed | Sub County |
| 88 | 42721119 ST. MARK’S WAYAGA SECONDARY SCHOOL | Mixed | Sub County |
| 89 | 42721120 ST.MATHEWS OCHIENG ‘A SECONDARY SCHOOL | Mixed | Sub County |
| 90 | 42721121 TUJU MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 91 | 42721122 RUMA SECONDARY SCHOOL | Mixed | Sub County |
| 92 | 42721123 AGOK MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 93 | 42721204 ST. MATHEWS KANDARIA SECONDARY SCHOOL | Mixed | Sub County |
| 94 | 42721206 MAJANGO SECONDARY SCHOOL | Mixed | Sub County |
| 95 | 42721207 SIGER SECONDARY SCHOOL | Mixed | Sub County |
| 96 | 42721208 KITAMBO MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 97 | 42721209 MAHAYA MIXED DAY SECONDARY SCHOOL | Mixed | Sub County |
| 98 | 42721210 RARIEDA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 99 | 42721211 ST.JOHN’S OBOCH MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 100 | 42721212 ST PHILIPS WERA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 101 | 42721213 ST MATHEWS SARADIDI MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 102 | 42721214 KOKISE MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 103 | 42721215 WANG’AROT MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 104 | 42721216 NYAMOR SECONDARY SCHOOL | Mixed | Sub County |
| 105 | 42721217 MEMBA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 106 | 42721218 ST MARY’S POWO MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 107 | 42721219 RAMBUGU MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 108 | 42721220 ENG. GUMBO RAMBIRA GIRLS’ SECONDARY SCHOOL | Girls | Sub County |
| 109 | 42721221 ST. LUKE’S LUORO SECONDARY SCHOOL | Mixed | Sub County |
| 120 | 42721222 ST. NICHOLAS BOI MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 121 | 42725103 YENGA SECONDARY SCHOOL | Mixed | Sub County |
| 122 | 42725104 NDENGA SECONDARY SCHOOL | Mixed | Sub County |
| 123 | 42725105 KAGONYA SECONDARY SCHOOL | Mixed | Sub County |
| 124 | 42725106 MIYARE SECONDARY SCHOOL | Mixed | Sub County |
| 125 | 42725107 SEGA TOWNSHIP MIXED DAY SECONDARY SCHOOL | Mixed | Sub County |
| 126 | 42725108 ST.STEPHEN’S SIGINGA SECONDARY SCHOOL | Mixed | Sub County |
| 127 | 42725109 ST. CHARLES HUMWEND SECONDARY SCHOOL | Mixed | Sub County |
| 128 | 42725110 SIRANGA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 129 | 42725111 LIFUNGA GIRLS SECONDARY SCHOOL | Girls | Sub County |
| 130 | 42725112 ST. NICHOLAS HAFUMBRE SECONDARY SCHOOL | Mixed | Sub County |
| 131 | 42725113 SIFUYO SECONDARY SCHOOL | Mixed | Sub County |
| 132 | 42725114 GOT ODIMA SECONDARY SCHOOL | Mixed | Sub County |
| 133 | 42725115 ST.JOSEPH UYUNDO SECONDARY SCHOOL | Mixed | Sub County |
| 134 | 42725117 SIWAR SECONDARY SCHOOL | Mixed | Sub County |
| 135 | 42725118 KOGERE SECONDARY SCHOOL | Mixed | Sub County |
| 136 | 42725201 JERA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 137 | 42725202 ANYIKO SECONDARY SCHOOL | Mixed | Sub County |
| 138 | 42725203 INUNGO SECONDARY SCHOOL | Mixed | Sub County |
| 139 | 42725204 SIHAY SECONDARY SCHOOL | Mixed | Sub County |
| 140 | 42725205 RAMUNDE MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 141 | 42725206 ST. BENEDICTS KONYA SECONDARY SCHOOL | Mixed | Sub County |
| 142 | 42725207 LUANDA KATHIENO MIXED DAY SECONDARY SCHOOL | Mixed | Sub County |
| 143 | 42725208 RALAK GIRLS SECONDARY SCHOOL | Girls | Sub County |
| 144 | 42725209 GOT NANGA SECONDARY SCHOOL | Mixed | Sub County |
| 145 | 42725211 UDIRA SECONDARY SCHOOL | Mixed | Sub County |
| 146 | 42725212 ST.JACOB’S MIXED SECONDARY SCHOOL – USINDA | Mixed | Sub County |
| 147 | 42725213 ST. EDWARDS SECONDARY SCHOOL-MASAMRA | Mixed | Sub County |
| 148 | 42726109 SAGAM SECONDARY SCHOOL | Mixed | Sub County |
| 149 | 42726110 URANGA SECONDARY SCHOOL | Mixed | Sub County |
| 150 | 42726111 MUTUMBU GIRLS SECONDARY SCHOOL | Girls | Sub County |
| 151 | 42726112 NYANGULU SECONDARY SCHOOL | Mixed | Sub County |
| 152 | 42726113 NDERE MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 153 | 42726114 ST. BARNABAS ANYIKO MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 154 | 42726115 NYABEDA SECONDARY SCHOOL | Mixed | Sub County |
| 155 | 42726116 GONGO WAROM MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 156 | 42726117 LUNDHA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 157 | 42726118 B.A OHANGA MEMORIAL SECONDARY SCHOOL | Mixed | Sub County |
| 158 | 42726119 ST MARKS KAGILO SECONDARY SCHOOL | Mixed | Sub County |
| 159 | 42726120 LIHANDA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 160 | 42726121 RAMULA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 161 | 42726122 ST.PAUL’S JINA SECONDARY SCHOOL | Mixed | Sub County |
| 162 | 42726123 YALA TOWNSHIP SECONDARY SCHOOL | Mixed | Sub County |
| 163 | 42726124 LURI MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 164 | 42726125 ONDING MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 165 | 42726126 ST. PAUL SIRIWO MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 166 | 42726127 BAR SAURI MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 167 | 42726203 KAMBARE SECONDARY SCHOOL | Mixed | Sub County |
| 168 | 42726204 HORACE ONGILI SECONDARY SCHOOL | Mixed | Sub County |
| 169 | 42726205 KAUDHA SECONDARY SCHOOL | Mixed | Sub County |
| 170 | 42726207 APUOYO MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 171 | 42726208 NDORI MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 172 | 42726209 DIENYA SECONDARY SCHOOL | Mixed | Sub County |
| 173 | 42726210 WAGWER MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 174 | 42726211 MALELE MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 175 | 42726212 DHENE MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 176 | 42726213 MALUNGA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 177 | 42726214 OJOLA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 178 | 42726215 NDEGWE SECONDARY SCHOOL | Mixed | Sub County |
| 179 | 42726216 ST.STEPHEN’S ALUOR MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 180 | 42726217 NYASIDHI SECONDARY SCHOOL | Mixed | Sub County |
| 181 | 42726219 NYALUNYA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 182 | 42726220 ST. PETER’S WAGAI MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 183 | 42726221 NYAPIEDHO MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 184 | 42738104 SIGOMRE SECONDARY SCHOOL | Mixed | Sub County |
| 185 | 42738105 MOI SECONDARY SCHOOL ULOMA | Mixed | Sub County |
| 186 | 42738107 SIMENYA SECONDARY SCHOOL | Mixed | Sub County |
| 187 | 42738108 SIDINDI SECONDARY SCHOOL | Mixed | Sub County |
| 188 | 42738109 UMINA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 189 | 42738110 MADUNGU SECONDARY SCHOOL | Mixed | Sub County |
| 190 | 42738111 ST. PETER’S RAMBULA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 191 | 42738112 MUDHIERO MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 192 | 42738113 NYASANDA COMMUNITY HIGH SCHOOL | Mixed | Sub County |
| 193 | 42738114 TINGARE MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 194 | 42738116 ST. ANTONY ULUTHE SECONDARY SCHOOL | Mixed | Sub County |
| 195 | 42738117 ST. AUGUSTINE’S OGEDA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 196 | 42738118 HOLY TRINITY MAYINGO SECONDARY SCHOOL | Mixed | Sub County |
| 197 | 42738119 NGUNYA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 198 | 42738120 ST PETERS BAR ATHENG MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 199 | 42738121 KONJRA MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 200 | 42738122 ST.ALLOICE MBOSIE MIXED SECONDARY SCHOOL | Mixed | Sub County |
| 201 | 42738123 ULWANI SECONDARY SCHOOL | Mixed | Sub County |
| 202 | 42738124 ST. PETER’S UKALAMA SECONDARY SCHOOL | Mixed | Sub County |
| 203 | 42738125 SIMERRO MIXED SECONDARY SCHOOL | Mixed | Sub County |