DA postcode district map, Dartford
Supplier statuses last checked .
The DA postcode area covers 18 districts and 9,221 live postcodes, from DA1 to DA18. It is centred on Dartford and also covers Swanley, Northfleet, Gravesend and Swanscombe.
Districts here average 512 postcodes.
Where the DA districts sit
Where DA sits
It falls across Kent and Greater London.
Water supply across DA
All 18 DA districts are supplied by Thames Water. That makes DA simple in a way many areas are not: one company, one set of rules, one status to check.
Thames Water has a hosepipe ban in force from 23 July 2026, covering the whole of DA.
The shape of the DA area
DA1 is the largest district with 1,266 postcodes around Dartford, and DA18 the smallest with 68. The area divides into 58 postcode sectors.
Several districts share a settlement, which is a common source of confusion when a form rejects an address: DA1, DA2, DA7, DA8, DA17 and DA18 all point at Dartford, DA4, DA5, DA6, DA14, DA15 and DA16 all point at Swanley and DA3, DA11 and DA13 all point at Northfleet.
What borders DA
DA sits next to BR (Swanley) to the south west, RM (Chigwell) to the north, SE (City of London) to the west, IG (Chigwell) to the north west and E (City of London) to the north west.
Its neighbours run in 4 different directions, so DA is landlocked by other postcode areas on most sides.
DA districts, settlements and water supply
| District | Principal settlement | Water company | Hosepipe ban status |
|---|---|---|---|
| DA1 | Dartford | Thames Water / SES Water | Depends on your supplier |
| DA2 | Dartford | Thames Water / SES Water | Depends on your supplier |
| DA3 | Northfleet | Thames Water / SES Water | Depends on your supplier |
| DA4 | Swanley | Thames Water / SES Water | Depends on your supplier |
| DA5 | Swanley | Thames Water / SES Water | Depends on your supplier |
| DA6 | Swanley | Thames Water / SES Water | Depends on your supplier |
| DA7 | Dartford | Thames Water / SES Water | Depends on your supplier |
| DA8 | Dartford | Thames Water / SES Water | Depends on your supplier |
| DA9 | Swanscombe | Thames Water / SES Water | Depends on your supplier |
| DA10 | Swanscombe | Thames Water / SES Water | Depends on your supplier |
| DA11 | Northfleet | Thames Water / SES Water | Depends on your supplier |
| DA12 | Gravesend | Thames Water / SES Water | Depends on your supplier |
| DA13 | Northfleet | Thames Water / SES Water | Depends on your supplier |
| DA14 | Swanley | Thames Water / SES Water | Depends on your supplier |
| DA15 | Swanley | Thames Water / SES Water | Depends on your supplier |
| DA16 | Swanley | Thames Water / SES Water | Depends on your supplier |
| DA17 | Dartford | Thames Water / SES Water | Depends on your supplier |
| DA18 | Dartford | Thames Water / SES 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 DA
No water company covering DA 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 |
|---|---|---|---|---|
| DA1 | Not published by Thames Water. Check with your supplier. | |||
| DA2 | Not published by Thames Water. Check with your supplier. | |||
| DA3 | Not published by Thames Water. Check with your supplier. | |||
| DA4 | Not published by Thames Water. Check with your supplier. | |||
| DA5 | Not published by Thames Water. Check with your supplier. | |||
| DA6 | Not published by Thames Water. Check with your supplier. | |||
| DA7 | Not published by Thames Water. Check with your supplier. | |||
| DA8 | Not published by Thames Water. Check with your supplier. | |||
| DA9 | Not published by Thames Water. Check with your supplier. | |||
| DA10 | Not published by Thames Water. Check with your supplier. | |||
| DA11 | Not published by Thames Water. Check with your supplier. | |||
| DA12 | Not published by Thames Water. Check with your supplier. | |||
| DA13 | Not published by Thames Water. Check with your supplier. | |||
| DA14 | Not published by Thames Water. Check with your supplier. | |||
| DA15 | Not published by Thames Water. Check with your supplier. | |||
| DA16 | Not published by Thames Water. Check with your supplier. | |||
| DA17 | Not published by Thames Water. Check with your supplier. | |||
| DA18 | Not published by Thames 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 DA 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 DA area?
There are 18 DA postcode districts, running from DA1 to DA18, and they contain 9,221 live postcodes across 58 sectors.
What towns does the DA postcode area cover?
DA covers Dartford, Swanley, Northfleet, Gravesend and Swanscombe. The area takes its name from Dartford, and each district is listed with its settlement in the table on this page.
Which water company supplies DA postcodes?
Thames Water supplies all 18 DA 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 DA1 and DA2 both say Dartford?
DA1, DA2, DA7, DA8, DA17 and DA18 all serve Dartford, 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 DA postcode map?
Yes. This page offers the DA 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.
Which councils cover the DA postcode area?
DA reaches into Kent and Greater London. 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.
How many postcode sectors are in DA?
DA contains 58 postcode sectors across its 18 districts. A sector is the district plus the first digit of the second half of the postcode, and it is the level a delivery round is actually planned around.