TN postcode district map, Royal Tunbridge Wells
Supplier statuses last checked .
The TN postcode area covers 40 districts and 23,179 live postcodes, from TN1 to TN40. It is centred on Sevenoaks and also covers Hastings, Tenterden, Royal Tunbridge Wells, Ashford and Tonbridge.
Districts here average 579 postcodes.
Where the TN districts sit
11 districts are plotted without a label where labels would overlap; every one is in the table below.
Where TN sits
It is administratively fragmented, reaching into Kent, East Sussex, Greater London and Surrey and 0 other authorities.
Water supply across TN
All 40 TN districts are supplied by South East 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 East Water has a hosepipe ban in force from 3 July 2026, covering the whole of TN.
The shape of the TN area
TN12 is the largest district with 1,262 postcodes around Paddock Wood, and TN7 the smallest with 98. The area divides into 126 postcode sectors.
No single district dominates: the largest holds only about 5 per cent of the area's postcodes.
Several districts share a settlement, which is a common source of confusion when a form rejects an address: TN17, TN18, TN27 and TN30 all point at Tenterden, TN34, TN35, TN37 and TN38 all point at Hastings and TN1, TN2 and TN3 all point at Royal Tunbridge Wells.
What borders TN
TN sits next to ME (Rochester) to the north, DA (Dartford) to the north west, BR (Swanley) to the north west, BN (Brighton and Hove) to the south west and RH (Redhill) to the west.
Its neighbours run in 4 different directions, so TN is landlocked by other postcode areas on most sides.
TN districts, settlements and water supply
| District | Principal settlement | Water company | Hosepipe ban status |
|---|---|---|---|
| TN1 | Royal Tunbridge Wells | South East Water / Southern Water | Depends on your supplier |
| TN2 | Royal Tunbridge Wells | South East Water / Southern Water | Depends on your supplier |
| TN3 | Royal Tunbridge Wells | South East Water / Southern Water | Depends on your supplier |
| TN4 | Southborough | South East Water / Southern Water | Depends on your supplier |
| TN5 | Wadhurst | South East Water / Southern Water | Depends on your supplier |
| TN6 | Crowborough | South East Water / Southern Water | Depends on your supplier |
| TN7 | Crowborough | South East Water / Southern Water | Depends on your supplier |
| TN8 | Edenbridge | South East Water / Southern Water | Depends on your supplier |
| TN9 | Tonbridge | South East Water / Southern Water | Depends on your supplier |
| TN10 | Tonbridge | South East Water / Southern Water | Depends on your supplier |
| TN11 | Tonbridge | South East Water / Southern Water | Depends on your supplier |
| TN12 | Paddock Wood | South East Water / Southern Water | Depends on your supplier |
| TN13 | Sevenoaks | South East Water / Southern Water | Depends on your supplier |
| TN14 | Sevenoaks | South East Water / Southern Water | Depends on your supplier |
| TN15 | Sevenoaks | South East Water / Southern Water | Depends on your supplier |
| TN16 | Westerham | South East Water / Southern Water | Depends on your supplier |
| TN17 | Tenterden | South East Water / Southern Water | Depends on your supplier |
| TN18 | Tenterden | South East Water / Southern Water | Depends on your supplier |
| TN19 | Wadhurst | South East Water / Southern Water | Depends on your supplier |
| TN20 | Heathfield | South East Water / Southern Water | Depends on your supplier |
| TN21 | Heathfield | South East Water / Southern Water | Depends on your supplier |
| TN22 | Uckfield | South East Water / Southern Water | Depends on your supplier |
| TN23 | Ashford | South East Water / Southern Water | Depends on your supplier |
| TN24 | Kennington | South East Water / Southern Water | Depends on your supplier |
| TN25 | Kennington | South East Water / Southern Water | Depends on your supplier |
| TN26 | Ashford | South East Water / Southern Water | Depends on your supplier |
| TN27 | Tenterden | South East Water / Southern Water | Depends on your supplier |
| TN28 | New Romney | South East Water / Southern Water | Depends on your supplier |
| TN29 | Lydd | South East Water / Southern Water | Depends on your supplier |
| TN30 | Tenterden | South East Water / Southern Water | Depends on your supplier |
| TN31 | Rye | South East Water / Southern Water | Depends on your supplier |
| TN32 | Battle | South East Water / Southern Water | Depends on your supplier |
| TN33 | Battle | South East Water / Southern Water | Depends on your supplier |
| TN34 | Hastings | South East Water / Southern Water | Depends on your supplier |
| TN35 | Hastings | South East Water / Southern Water | Depends on your supplier |
| TN36 | Rye | South East Water / Southern Water | Depends on your supplier |
| TN37 | Hastings | South East Water / Southern Water | Depends on your supplier |
| TN38 | Hastings | South East Water / Southern Water | Depends on your supplier |
| TN39 | Bexhill-on-Sea | South East Water / Southern Water | Depends on your supplier |
| TN40 | Bexhill-on-Sea | South East Water / Southern Water | Depends on your supplier |
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 TN
No water company covering TN 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 |
|---|---|---|---|---|
| TN1 | Not published by South East Water. Check with your supplier. | |||
| TN2 | Not published by South East Water. Check with your supplier. | |||
| TN3 | Not published by South East Water. Check with your supplier. | |||
| TN4 | Not published by South East Water. Check with your supplier. | |||
| TN5 | Not published by South East Water. Check with your supplier. | |||
| TN6 | Not published by South East Water. Check with your supplier. | |||
| TN7 | Not published by South East Water. Check with your supplier. | |||
| TN8 | Not published by South East Water. Check with your supplier. | |||
| TN9 | Not published by South East Water. Check with your supplier. | |||
| TN10 | Not published by South East Water. Check with your supplier. | |||
| TN11 | Not published by South East Water. Check with your supplier. | |||
| TN12 | Not published by South East Water. Check with your supplier. | |||
| TN13 | Not published by South East Water. Check with your supplier. | |||
| TN14 | Not published by South East Water. Check with your supplier. | |||
| TN15 | Not published by South East Water. Check with your supplier. | |||
| TN16 | Not published by South East Water. Check with your supplier. | |||
| TN17 | Not published by South East Water. Check with your supplier. | |||
| TN18 | Not published by South East Water. Check with your supplier. | |||
| TN19 | Not published by South East Water. Check with your supplier. | |||
| TN20 | Not published by South East Water. Check with your supplier. | |||
| TN21 | Not published by South East Water. Check with your supplier. | |||
| TN22 | Not published by South East Water. Check with your supplier. | |||
| TN23 | Not published by South East Water. Check with your supplier. | |||
| TN24 | Not published by South East Water. Check with your supplier. | |||
| TN25 | Not published by South East Water. Check with your supplier. | |||
| TN26 | Not published by South East Water. Check with your supplier. | |||
| TN27 | Not published by South East Water. Check with your supplier. | |||
| TN28 | Not published by South East Water. Check with your supplier. | |||
| TN29 | Not published by South East Water. Check with your supplier. | |||
| TN30 | Not published by South East Water. Check with your supplier. | |||
| TN31 | Not published by South East Water. Check with your supplier. | |||
| TN32 | Not published by South East Water. Check with your supplier. | |||
| TN33 | Not published by South East Water. Check with your supplier. | |||
| TN34 | Not published by South East Water. Check with your supplier. | |||
| TN35 | Not published by South East Water. Check with your supplier. | |||
| TN36 | Not published by South East Water. Check with your supplier. | |||
| TN37 | Not published by South East Water. Check with your supplier. | |||
| TN38 | Not published by South East Water. Check with your supplier. | |||
| TN39 | Not published by South East Water. Check with your supplier. | |||
| TN40 | Not published by South East 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 TN 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 TN area?
There are 40 TN postcode districts, running from TN1 to TN40, and they contain 23,179 live postcodes across 126 sectors.
What towns does the TN postcode area cover?
TN covers Sevenoaks, Hastings, Tenterden, Royal Tunbridge Wells, Ashford and Tonbridge. The area takes its name from Sevenoaks, and each district is listed with its settlement in the table on this page.
Which water company supplies TN postcodes?
South East Water supplies all 40 TN 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 TN17 and TN18 both say Tenterden?
TN17, TN18, TN27 and TN30 all serve Tenterden, 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 TN postcode map?
Yes. This page offers the TN 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 TN area called Royal Tunbridge Wells when it covers Paddock Wood?
TN takes its letters from Royal Tunbridge Wells, where the sorting office that served the area was based when the code was allocated. Paddock Wood is the largest settlement in the area today, in TN12, but the area code follows the historic sorting geography rather than current population.
Which councils cover the TN postcode area?
TN reaches into Kent, East Sussex, Greater London and Surrey. 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.