| Locality | Postal Code |
|---|---|
| Stockton-on-Tees | TS16, TS17, TS18, TS19, TS20, … |
| Teesside Industrial Estate | TS17 |
| Teesside Shopping Park | TS17 7BW |
| Thornaby | TS17 |
| Thorpe Thewles | TS21 |
| Whinney Hill | TS21 |
| Whitton Village | TS21 |
| Wolviston | TS22 |
| Wynyard | TS22 |
| Wynyard Business Park | TS22 5FD, TS22 5FE, TS22 … |
| Yarm | TS15 |