| Postal Code | Town | County |
|---|---|---|
| 90113 | Sengani | Machakos |
| 50308 | Serem | Vihiga |
| 30407 | Seretunin | Baringo |
| 20150 | Shabaab | Nakuru |
| 50106 | Shianda | Kakamega |
| 50129 | Shiatsala | Kakamega |
| 50130 | Shibuli | Kakamega |
| 50131 | Shimanyiro | Kakamega |
| 80407 | Shimba Hills | Kwale |
| 50107 | Shinyalu | Kakamega |