Districts in the TR area
| District | Main place | Local authority | Sectors | Postcodes |
|---|---|---|---|---|
| TR1 | Truro | Cornwall | 4 | 924 |
| TR2 | Probus | Cornwall | 2 | 535 |
| TR3 | Threemilestone | Cornwall | 2 | 489 |
| TR4 | Chacewater | Cornwall | 2 | 524 |
| TR5 | St Agnes | Cornwall | 1 | 183 |
| TR6 | Perranporth | Cornwall | 1 | 154 |
| TR7 | Newquay | Cornwall | 4 | 682 |
| TR8 | Newquay | Cornwall | 2 | 601 |
| TR9 | St Columb Major | Cornwall | 1 | 286 |
| TR10 | Penryn | Cornwall | 2 | 384 |
| TR11 | Falmouth | Cornwall | 5 | 1,038 |
| TR12 | Mullion | Cornwall | 2 | 435 |
| TR13 | Helston | Cornwall | 4 | 783 |
| TR14 | Camborne | Cornwall | 5 | 857 |
| TR15 | Redruth | Cornwall | 4 | 725 |
| TR16 | Lanner | Cornwall | 3 | 668 |
| TR17 | Marazion | Cornwall | 1 | 93 |
| TR18 | Penzance | Cornwall | 5 | 862 |
| TR19 | St Just | Cornwall | 2 | 517 |
| TR20 | Goldsithney | Cornwall | 2 | 517 |
| TR21 | Hugh Town | Isles of Scilly | 1 | 73 |
| TR22 | — | Isles of Scilly | 1 | 1 |
| TR23 | The Town | Isles of Scilly | 1 | 1 |
| TR24 | New Grimsby | Isles of Scilly | 1 | 17 |
| TR25 | Higher Town | Isles of Scilly | 1 | 3 |
| TR26 | St Ives | Cornwall | 4 | 651 |
| TR27 | Hayle | Cornwall | 4 | 556 |