Postcode GU21
Horsell +2 · Surrey, England
GU21 is the postcode of Horsell, Knaphill, St John's in Surrey, England, United Kingdom. This list covers outward codes — the first half of a UK postcode, such as M9 or BN91 — not full postcodes.
- Postcode
- GU21
- County
- Surrey
- Country
- England
- Country
- United Kingdom
3 places with postcode GU21
| Place | County | Location |
|---|---|---|
| Horsell | Surrey | 51.326, -0.569 |
| Knaphill | Surrey | 51.319, -0.615 |
| St John's | Surrey | 51.322, -0.592 |
Near London
The nearest major city is London, about 38 km away.
Nearby postcodes
Frequently asked questions
Which places use postcode GU21?
Horsell, Knaphill, St John's.
Which county and country is GU21 in?
Surrey, England, United Kingdom.
What is the nearest major city to GU21?
London, about 38 km away.
Source: GeoNames postal codes (CC BY 4.0), geonames.org, retrieved 2026-10-22. Place coordinates are approximate. Check with the national postal service before sending anything valuable.