EN postcode district map, Waltham Cross
Supplier statuses last checked .
The EN postcode area covers 12 districts and 8,536 live postcodes, from EN1 to EN77. It is centred on Waltham Cross and also covers Potters Bar, Cheshunt, Hoddesdon and Waltham Abbey.
Districts here average 711 postcodes.
Where the EN districts sit
Where EN sits
It falls across Hertfordshire, Greater London and Essex.
Water supply across EN
All 12 EN districts are supplied by Affinity Water. That makes EN simple in a way many areas are not: one company, one set of rules, one status to check.
We are re-checking Affinity Water's status. It was last confirmed on 16 September 2026 as ban in force, and until it is confirmed again this page does not assert a current position for it.
The shape of the EN area
EN5 is the largest district with 1,045 postcodes around Potters Bar, and EN77 the smallest with 58. The area divides into 46 postcode sectors.
The numbering is not continuous. EN runs up to 77 but has only 12 districts, so 65 numbers are unused:.
District by district: EN1 serves Waltham Cross, EN2 serves Waltham Cross, EN3 serves Waltham Cross, EN4 serves Potters Bar, EN5 serves Potters Bar, EN6 serves Potters Bar, EN7 serves Cheshunt, EN8 serves Cheshunt, EN9 serves Waltham Abbey, EN10 serves Hoddesdon and EN11 serves Hoddesdon.
Several districts share a settlement, which is a common source of confusion when a form rejects an address: EN1, EN2 and EN3 all point at Waltham Cross, EN4, EN5 and EN6 all point at Potters Bar and EN7 and EN8 all point at Cheshunt.
EN77 is a non-geographic district: it carries no coordinates because it is used for PO boxes and large users rather than for streets. It appears in the table below but cannot be placed on the map.
What borders EN
EN sits next to N (City of London) to the south, AL (St Albans) to the north west, NW (London) to the south west, IG (Chigwell) to the south east and E (City of London) to the south.
Its neighbours run in 4 different directions, so EN is landlocked by other postcode areas on most sides.
EN districts, settlements and water supply
| District | Principal settlement | Water company | Hosepipe ban status |
|---|---|---|---|
| EN1 | Waltham Cross | Affinity Water / Thames Water | Depends on your supplier |
| EN2 | Waltham Cross | Affinity Water / Thames Water | Ban in force |
| EN3 | Waltham Cross | Affinity Water / Thames Water | Depends on your supplier |
| EN4 | Potters Bar | Affinity Water / Thames Water | Ban in force |
| EN5 | Potters Bar | Affinity Water / Thames Water | Ban in force |
| EN6 | Potters Bar | Affinity Water / Thames Water | Ban in force |
| EN7 | Cheshunt | Affinity Water / Thames Water | Ban in force |
| EN8 | Cheshunt | Affinity Water / Thames Water | Depends on your supplier |
| EN9 | Waltham Abbey | Affinity Water / Thames Water | Ban in force |
| EN10 | Hoddesdon | Affinity Water / Thames Water | Ban in force |
| EN11 | Hoddesdon | Affinity Water / Thames Water | Ban in force |
| EN77 | — | Affinity Water / Thames 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 EN
No water company covering EN 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 |
|---|---|---|---|---|
| EN1 | Not published by Affinity Water. Check with your supplier. | |||
| EN2 | Not published by Affinity Water. Check with your supplier. | |||
| EN3 | Not published by Affinity Water. Check with your supplier. | |||
| EN4 | Not published by Affinity Water. Check with your supplier. | |||
| EN5 | Not published by Affinity Water. Check with your supplier. | |||
| EN6 | Not published by Affinity Water. Check with your supplier. | |||
| EN7 | Not published by Affinity Water. Check with your supplier. | |||
| EN8 | Not published by Affinity Water. Check with your supplier. | |||
| EN9 | Not published by Affinity Water. Check with your supplier. | |||
| EN10 | Not published by Affinity Water. Check with your supplier. | |||
| EN11 | Not published by Affinity Water. Check with your supplier. | |||
| EN77 | Not published by Affinity 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 EN 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 EN area?
There are 12 EN postcode districts, running from EN1 to EN77, and they contain 8,536 live postcodes across 46 sectors.
What towns does the EN postcode area cover?
EN covers Waltham Cross, Potters Bar, Cheshunt, Hoddesdon and Waltham Abbey. The area takes its name from Waltham Cross, and each district is listed with its settlement in the table on this page.
Which water company supplies EN postcodes?
Affinity Water supplies all 12 EN 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 EN1 and EN2 both say Waltham Cross?
EN1, EN2 and EN3 all serve Waltham Cross, 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.
What is EN77 used for?
EN77 is a non-geographic postcode district. It is used for PO boxes and large users such as banks and government departments that receive enough mail to need their own code, so it has no streets and no position on a map.
Can I download a free EN postcode map?
Yes. This page offers the EN 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 EN area called Waltham Cross when it covers Potters Bar?
EN takes its letters from Waltham Cross, where the sorting office that served the area was based when the code was allocated. Potters Bar is the largest settlement in the area today, in EN5, but the area code follows the historic sorting geography rather than current population.