Districts in the SL area
| District | Main place | Local authority | Sectors | Postcodes |
|---|---|---|---|---|
| SL0 | Iver Heath | Buckinghamshire | 3 | 345 |
| SL1 | Slough | Slough | 10 | 1,654 |
| SL2 | Slough | Slough | 5 | 1,132 |
| SL3 | Slough | Slough | 6 | 1,077 |
| SL4 | Windsor | Windsor and Maidenhead | 7 | 1,376 |
| SL5 | North Ascot | Windsor and Maidenhead | 5 | 888 |
| SL6 | Maidenhead | Windsor and Maidenhead | 10 | 2,316 |
| SL7 | Marlow | Buckinghamshire | 4 | 695 |
| SL8 | Bourne End | Buckinghamshire | 1 | 264 |
| SL9 | Chalfont St Peter | Buckinghamshire | 5 | 872 |
| SL60 | Maidenhead | Windsor and Maidenhead | 1 | 30 |
| SL95 | Slough | Slough | 1 | 23 |
Main places in the SL area
- Slough
- Maidenhead
- Windsor
- Chalfont St Peter
- Marlow
- Gerrards Cross
- Cookham
- North Ascot
- Bourne End
- Broomhall
- Sunninghill
- Iver Heath
- Stoke Poges
- Datchet
- Old Windsor
- South Ascot
- Eton
- Farnham Common
- Sunningdale
- Iver
- Poyle
- Ascot
- Farnham Royal
- Marlow Bottom
- Colnbrook
- Richings Park
- Eton Wick
- Cores End
- Cranbourne
- Egypt