IG postcode district map, Chigwell
Supplier statuses last checked .
The IG postcode area covers 11 districts and 6,106 live postcodes, from IG1 to IG11. It is centred on Chigwell and also covers Loughton.
Districts here average 555 postcodes.
Where the IG districts sit
Where IG sits
It falls across Greater London and Essex.
Water supply across IG
All 11 IG districts are supplied by Thames Water. That makes IG 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 IG.
The shape of the IG area
IG11 is the largest district with 1,023 postcodes around Chigwell, and IG4 the smallest with 138. The area divides into 35 postcode sectors.
District by district: IG1 serves Chigwell, IG2 serves Chigwell, IG3 serves Chigwell, IG4 serves Chigwell, IG5 serves Chigwell, IG6 serves Chigwell, IG7 serves Chigwell, IG8 serves Chigwell, IG9 serves Chigwell, IG10 serves Loughton and IG11 serves Chigwell.
Several districts share a settlement, which is a common source of confusion when a form rejects an address: IG1, IG2, IG3, IG4, IG5, IG6, IG7, IG8, IG9 and IG11 all point at Chigwell.
What borders IG
IG sits next to E (City of London) to the south west, RM (Chigwell) to the east, N (City of London) to the west, EC (City of London) to the south west and WC (London) to the south west.
IG districts, settlements and water supply
| District | Principal settlement | Water company | Hosepipe ban status |
|---|---|---|---|
| IG1 | Chigwell | Thames Water | Ban in force |
| IG2 | Chigwell | Thames Water | Ban in force |
| IG3 | Chigwell | Thames Water | Ban in force |
| IG4 | Chigwell | Thames Water | Ban in force |
| IG5 | Chigwell | Thames Water | Ban in force |
| IG6 | Chigwell | Thames Water | Ban in force |
| IG7 | Chigwell | Thames Water | Ban in force |
| IG8 | Chigwell | Thames Water | Ban in force |
| IG9 | Chigwell | Thames Water | Ban in force |
| IG10 | Loughton | Thames Water | Ban in force |
| IG11 | Chigwell | Thames 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 IG
No water company covering IG 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 |
|---|---|---|---|---|
| IG1 | Not published by Thames Water. Check with your supplier. | |||
| IG2 | Not published by Thames Water. Check with your supplier. | |||
| IG3 | Not published by Thames Water. Check with your supplier. | |||
| IG4 | Not published by Thames Water. Check with your supplier. | |||
| IG5 | Not published by Thames Water. Check with your supplier. | |||
| IG6 | Not published by Thames Water. Check with your supplier. | |||
| IG7 | Not published by Thames Water. Check with your supplier. | |||
| IG8 | Not published by Thames Water. Check with your supplier. | |||
| IG9 | Not published by Thames Water. Check with your supplier. | |||
| IG10 | Not published by Thames Water. Check with your supplier. | |||
| IG11 | 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 IG 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 IG area?
There are 11 IG postcode districts, running from IG1 to IG11, and they contain 6,106 live postcodes across 35 sectors.
What towns does the IG postcode area cover?
IG covers Chigwell and Loughton. The area takes its name from Chigwell, and each district is listed with its settlement in the table on this page.
Which water company supplies IG postcodes?
Thames Water supplies all 11 IG 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 IG1 and IG2 both say Chigwell?
IG1, IG2, IG3, IG4, IG5, IG6, IG7, IG8, IG9 and IG11 all serve Chigwell, 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 IG postcode map?
Yes. This page offers the IG 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 IG postcode area?
IG reaches into Greater London and Essex. 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 IG?
IG contains 35 postcode sectors across its 11 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.