In Kenya, extra county schools fall in the second tier after national schools. In recent years, cases have emerged where extra county schools perform better than national school. Maranda High and Ngiya Girls are the national schools in Siaya county. Extra county secondary schools in Siaya county are grouped into three clusters; cluster one(C1), cluster two(C2) and cluster three (C3). Sawagongo High School, Nyamira Girls Secondary School, Sega Girls Secondary School among other schools form cluster one schools in Siaya county.
Here is a list of best performing Extra County schools in Siaya County
| S/N | SCHOOL CODE | SCHOOL NAME | TYPE | CLUSTER |
| 1. | 42705102 | Bishop Okoth Girls’- Mbaga Secondary School | Girls | C1 |
| 2. | 42705202 | Barding Secondary School | Boys | C1 |
| 3. | 42712102 | Nyamira Girls Secondary School | Girls | C1 |
| 4. | 42712301 | Usenge High School | Boys | C1 |
| 5. | 42721101 | Chianda High School | Boys | C1 |
| 6. | 42721201 | St. Mary’s Lwak Girls’ School | Girls | C1 |
| 7. | 42721202 | Ramba Secondary School | Boys | C1 |
| 8. | 42726101 | St. Mary’s School, Yala | Boys | C1 |
| 9. | 42726107 | Sawagongo High School | Boys | C1 |
| 10. | 42738101 | St. Francis Ranga’la Girls Secondary School | Girls | C1 |
| 11. | 42738102 | Ambira High School | Boys | C1 |
| 12. | 42725102 | Sega Girls Secondary School | Girls | C2 |
| 13. | 42726202 | Aluor Girls Secondary School | Girls | C2 |
| 14. | 42712304 | Nyamonye Girls’ Secondary School | Girls | C3 |
| 15. | 42725101 | Ukwala Secondary School | Boys | C3 |
| 16. | 42726104 | Nyawara Girls’ Secondary School | Girls | C3 |
| 17. | 42738103 | Rang’ala Boys Secondary School | Boys | C3 |
Related posts;
List of best performing Extra County schools in Siaya County
List of best performing Extra County Secondary schools in Homa Bay County
List of best performing Extra County Secondary schools in Kisii County
List of best performing Extra County Secondary schools in Kisumu County
List of best performing Extra County schools in Kericho County
List of best performing Extra County schools in Nakuru County
List of best performing Extra County schools in Uasin Gishu County
List of best performing Extra County schools in Trans Nzoia County
List of best performing Extra County schools in Nairobi County
List of best performing Extra County Secondary Schools in Nyeri County
List of best performing Extra County Schools in Murang’a County and their Codes