TR postcode district map, Truro
Supplier statuses last checked .
The TR postcode area covers 27 districts and 12,559 live postcodes, from TR1 to TR27. It is centred on Truro and also covers Redruth, Newquay, Helston, Falmouth and Penryn.
Districts here average 465 postcodes.
Where the TR districts sit
12 districts are plotted without a label where labels would overlap; every one is in the table below.
Where TR sits
It falls across Cornwall and Isles of Scilly.
Water supply across TR
All 27 TR districts are supplied by South West Water, which is notable at this size: an area with this many districts usually crosses at least one supply boundary, and this one does not.
South West Water has a hosepipe ban in force from 8 August 2026, covering the whole of TR.
The shape of the TR area
The districts are wildly uneven: TR11 holds 1,038 postcodes around Falmouth and TR23 holds 1, a ratio of about 1038 to one. They divide into 67 sectors.
Several districts share a settlement, which is a common source of confusion when a form rejects an address: TR21, TR22, TR23, TR24 and TR25 all point at Hugh Town, TR1, TR2 and TR4 all point at Truro and TR5, TR15 and TR16 all point at Redruth.
What borders TR
TR sits next to PL (Plymouth) to the east, TQ (Torquay) to the east, EX (Exeter) to the north east, TA (Taunton) to the north east and SA (Abertawe) to the north east.
TR districts, settlements and water supply
| District | Principal settlement | Water company | Hosepipe ban status |
|---|---|---|---|
| TR1 | Truro | South West Water | Ban in force |
| TR2 | Truro | South West Water | Ban in force |
| TR3 | Penryn | South West Water | Ban in force |
| TR4 | Truro | South West Water | Ban in force |
| TR5 | Redruth | South West Water | Ban in force |
| TR6 | Newquay | South West Water | Ban in force |
| TR7 | Newquay | South West Water | Ban in force |
| TR8 | Newquay | South West Water | Ban in force |
| TR9 | St Columb Major | South West Water | Ban in force |
| TR10 | Penryn | South West Water | Ban in force |
| TR11 | Falmouth | South West Water | Ban in force |
| TR12 | Helston | South West Water | Ban in force |
| TR13 | Helston | South West Water | Ban in force |
| TR14 | Camborne | South West Water | Ban in force |
| TR15 | Redruth | South West Water | Ban in force |
| TR16 | Redruth | South West Water | Ban in force |
| TR17 | Marazion | South West Water | Ban in force |
| TR18 | Penzance | South West Water | Ban in force |
| TR19 | St Just | South West Water | Ban in force |
| TR20 | Marazion | South West Water | Ban in force |
| TR21 | Hugh Town | South West Water | Ban in force |
| TR22 | Hugh Town | South West Water | Ban in force |
| TR23 | Hugh Town | South West Water | Ban in force |
| TR24 | Hugh Town | South West Water | Ban in force |
| TR25 | Hugh Town | South West Water | Ban in force |
| TR26 | St Ives | South West Water | Ban in force |
| TR27 | Hayle | South West Water | Ban in force |
Principal settlement is the town or city each district sits in or nearest to, derived from OS Open Names. It is not the Royal Mail post town, which is licensed data and not published openly. Status is resolved live from each company’s own notice.
Water hardness in TR
No water company covering TR publishes hardness figures as open data. The gap is named per district below so you know who to ask.
| District | Hardness | As published | Supply zone | Published by |
|---|---|---|---|---|
| TR1 | Not published by South West Water. Check with your supplier. | |||
| TR2 | Not published by South West Water. Check with your supplier. | |||
| TR3 | Not published by South West Water. Check with your supplier. | |||
| TR4 | Not published by South West Water. Check with your supplier. | |||
| TR5 | Not published by South West Water. Check with your supplier. | |||
| TR6 | Not published by South West Water. Check with your supplier. | |||
| TR7 | Not published by South West Water. Check with your supplier. | |||
| TR8 | Not published by South West Water. Check with your supplier. | |||
| TR9 | Not published by South West Water. Check with your supplier. | |||
| TR10 | Not published by South West Water. Check with your supplier. | |||
| TR11 | Not published by South West Water. Check with your supplier. | |||
| TR12 | Not published by South West Water. Check with your supplier. | |||
| TR13 | Not published by South West Water. Check with your supplier. | |||
| TR14 | Not published by South West Water. Check with your supplier. | |||
| TR15 | Not published by South West Water. Check with your supplier. | |||
| TR16 | Not published by South West Water. Check with your supplier. | |||
| TR17 | Not published by South West Water. Check with your supplier. | |||
| TR18 | Not published by South West Water. Check with your supplier. | |||
| TR19 | Not published by South West Water. Check with your supplier. | |||
| TR20 | Not published by South West Water. Check with your supplier. | |||
| TR21 | Not published by South West Water. Check with your supplier. | |||
| TR22 | Not published by South West Water. Check with your supplier. | |||
| TR23 | Not published by South West Water. Check with your supplier. | |||
| TR24 | Not published by South West Water. Check with your supplier. | |||
| TR25 | Not published by South West Water. Check with your supplier. | |||
| TR26 | Not published by South West Water. Check with your supplier. | |||
| TR27 | Not published by South West Water. Check with your supplier. | |||
Hardness is published per census area, not per postcode, so these figures characterise a district rather than measuring one address. They are a scale and taste matter, not a safety one. Hardness data version wessex-water@2022-2025+yorkshire-water@2026.
Download the TR data
No signup, no email wall. GeoJSON carries the district points, the supplier and the live status, so it can be dropped straight into a map.
District positions are averaged postcode centroids from OS Code-Point Open. They show roughly where a district sits, not where its boundary runs, and are not legal boundaries.
Frequently asked questions
How many postcode districts are in the TR area?
There are 27 TR postcode districts, running from TR1 to TR27, and they contain 12,559 live postcodes across 67 sectors.
What towns does the TR postcode area cover?
TR covers Truro, Redruth, Newquay, Helston, Falmouth and Penryn. The area takes its name from Truro, and each district is listed with its settlement in the table on this page.
Which water company supplies TR postcodes?
South West Water supplies all 27 TR districts. Supply boundaries follow the pipe network rather than postcode geography, so confirm against your water bill if you are near the edge of the area.
Why do TR21 and TR22 both say Hugh Town?
TR21, TR22, TR23, TR24 and TR25 all serve Hugh Town, covering different parts of it. A single town routinely needs more than one postcode district once it passes a few thousand delivery points, so this is normal rather than an error in an address.
Can I download a free TR postcode map?
Yes. This page offers the TR districts as GeoJSON, CSV and SVG, free and with no signup or email address required. The GeoJSON carries each district's position, its water company and its current restriction status, so it can be dropped straight into a mapping tool.
Why is the TR area called Truro when it covers Falmouth?
TR takes its letters from Truro, where the sorting office that served the area was based when the code was allocated. Falmouth is the largest settlement in the area today, in TR11, but the area code follows the historic sorting geography rather than current population.
Which councils cover the TR postcode area?
TR reaches into Cornwall and Isles of Scilly. A postcode area is not a council area: they were drawn for different purposes and a single district can sit across a council boundary, so your postcode does not tell you which authority you pay.