Sectors in SL9
| Sector | Main place | Postcodes |
|---|---|---|
| SL9 0 | Chalfont St Peter | 215 |
| SL9 1 | Gerrards Cross | 16 |
| SL9 7 | Gerrards Cross | 179 |
| SL9 8 | Gerrards Cross | 235 |
| SL9 9 | Chalfont St Peter | 227 |
Places covered by SL9
- Chalfont St Peter Buckinghamshire · 517
- Gerrards Cross Buckinghamshire · 293
- Tatling End Buckinghamshire · 16
- Horn Hill Buckinghamshire · 7