| Locality | Postal Code |
|---|---|
| Belasis Hall Technology Park | TS23 4EF, TS23 4HN |
| Billingham | TS22, TS23 |
| Carlton | TS21 |
| Castlelevington | TS15 |
| Cowpen Bewley | TS23 |
| Cowpen Lane Industrial Estate | TS23 4BU, TS23 4BY |
| Durham Lane Industrial Park | TS16 |
| Eaglescliffe | TS16 |
| Egglescliffe | TS16 |
| Elton | TS21 |
| Fairfield | TS19 7EW |
| High Leven | TS15 |
| Hilton | TS15 |
| Ingleby Barwick | TS17 |
| Kirklevington | TS15 |
| Long Newton | TS21 |
| Lowfields | TS17 0RR |
| Maltby | TS8 |
| North Tees Industrial Estate | TS18 2RJ, TS18 2RN |
| Norton | TS20 |
| Port Clarence | TS2 1SB, TS2 1SE |
| Portrack Interchange Business Park | TS18 2AD, TS18 2SG |
| Preston Farm Business Park | TS18 3TA, TS18 3TB |
| Preston Farm Industrial Estate | TS18 |
| Redmarshall | TS21 |
| Stillington | TS21 |