GU postcode district map, Guildford
Supplier statuses last checked .
The GU postcode area covers 38 districts and 22,616 live postcodes, from GU1 to GU52. It is centred on Guildford and also covers Woking, Godalming, Farnham, Aldershot and Camberley.
Districts here average 595 postcodes.
Where the GU districts sit
13 districts are plotted without a label where labels would overlap; every one is in the table below.
Where GU sits
It is administratively fragmented, reaching into Surrey, Hampshire, West Sussex and Bracknell Forest and 0 other authorities.
Water supply across GU
All 38 GU districts are supplied by Thames 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.
Thames Water has a hosepipe ban in force from 23 July 2026, covering the whole of GU.
The shape of the GU area
GU14 is the largest district with 1,351 postcodes around Farnborough, and GU18 the smallest with 145. The area divides into 133 postcode sectors.
No single district dominates: the largest holds only about 6 per cent of the area's postcodes.
The numbering is not continuous. GU runs up to 52 but has only 38 districts, so 14 numbers are unused:.
Several districts share a settlement, which is a common source of confusion when a form rejects an address: GU1, GU2, GU3, GU4 and GU5 all point at Guildford, GU15, GU18, GU19 and GU20 all point at Camberley and GU21, GU22, GU23 and GU24 all point at Woking.
What borders GU
GU sits next to KT (Esher) to the north east, RG (Reading) to the north west, SL (Slough) to the north, TW (Sunbury-on-Thames) to the north east and RH (Redhill) to the east.
Its neighbours run in 4 different directions, so GU is landlocked by other postcode areas on most sides.
GU districts, settlements and water supply
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 GU
No water company covering GU 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 |
|---|---|---|---|---|
| GU1 | Not published by Thames Water. Check with your supplier. | |||
| GU2 | Not published by Thames Water. Check with your supplier. | |||
| GU3 | Not published by Thames Water. Check with your supplier. | |||
| GU4 | Not published by Thames Water. Check with your supplier. | |||
| GU5 | Not published by Thames Water. Check with your supplier. | |||
| GU6 | Not published by Thames Water. Check with your supplier. | |||
| GU7 | Not published by Thames Water. Check with your supplier. | |||
| GU8 | Not published by Thames Water. Check with your supplier. | |||
| GU9 | Not published by Thames Water. Check with your supplier. | |||
| GU10 | Not published by Thames Water. Check with your supplier. | |||
| GU11 | Not published by Thames Water. Check with your supplier. | |||
| GU12 | Not published by Thames Water. Check with your supplier. | |||
| GU14 | Not published by Thames Water. Check with your supplier. | |||
| GU15 | Not published by Thames Water. Check with your supplier. | |||
| GU16 | Not published by Thames Water. Check with your supplier. | |||
| GU17 | Not published by Thames Water. Check with your supplier. | |||
| GU18 | Not published by Thames Water. Check with your supplier. | |||
| GU19 | Not published by Thames Water. Check with your supplier. | |||
| GU20 | Not published by Thames Water. Check with your supplier. | |||
| GU21 | Not published by Thames Water. Check with your supplier. | |||
| GU22 | Not published by Thames Water. Check with your supplier. | |||
| GU23 | Not published by Thames Water. Check with your supplier. | |||
| GU24 | Not published by Thames Water. Check with your supplier. | |||
| GU25 | Not published by Thames Water. Check with your supplier. | |||
| GU26 | Not published by Thames Water. Check with your supplier. | |||
| GU27 | Not published by Thames Water. Check with your supplier. | |||
| GU28 | Not published by Thames Water. Check with your supplier. | |||
| GU29 | Not published by Thames Water. Check with your supplier. | |||
| GU30 | Not published by Thames Water. Check with your supplier. | |||
| GU31 | Not published by Thames Water. Check with your supplier. | |||
| GU32 | Not published by Thames Water. Check with your supplier. | |||
| GU33 | Not published by Thames Water. Check with your supplier. | |||
| GU34 | Not published by Thames Water. Check with your supplier. | |||
| GU35 | Not published by Thames Water. Check with your supplier. | |||
| GU46 | Not published by Thames Water. Check with your supplier. | |||
| GU47 | Not published by Thames Water. Check with your supplier. | |||
| GU51 | Not published by Thames Water. Check with your supplier. | |||
| GU52 | 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 GU 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 GU area?
There are 38 GU postcode districts, running from GU1 to GU52, and they contain 22,616 live postcodes across 133 sectors.
What towns does the GU postcode area cover?
GU covers Guildford, Woking, Godalming, Farnham, Aldershot and Camberley. The area takes its name from Guildford, and each district is listed with its settlement in the table on this page.
Which water company supplies GU postcodes?
Thames Water supplies all 38 GU 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 GU1 and GU2 both say Guildford?
GU1, GU2, GU3, GU4 and GU5 all serve Guildford, 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 GU postcode map?
Yes. This page offers the GU 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 GU area called Guildford when it covers Farnborough?
GU takes its letters from Guildford, where the sorting office that served the area was based when the code was allocated. Farnborough is the largest settlement in the area today, in GU14, but the area code follows the historic sorting geography rather than current population.
Which councils cover the GU postcode area?
GU reaches into Surrey, Hampshire, West Sussex and Bracknell Forest. 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.