| Area Code▲ | City↕ | Administrative Region↕ | City Population↕ | Country/Region | Timezone |
|---|
| 20 | Nairobi | Nairobi County | 2,750,547 | Kenya | Africa/Nairobi |
| 45 | Ongata Rongai | Nairobi County | — | Kenya | Africa/Nairobi |
| 51 | Nakuru | Nakuru County | 259,903 | Kenya | Africa/Nairobi |
| 67 | Thika | Nairobi County | 200,000 | Kenya | Africa/Nairobi |