Postcode CM21
Allen's Green +2 · Hertfordshire, England
CM21 is the postcode of Allen's Green, High Wych, Sawbridgeworth in Hertfordshire, England, United Kingdom. This list covers outward codes — the first half of a UK postcode, such as M9 or BN91 — not full postcodes.
- Postcode
- CM21
- County
- Hertfordshire
- Country
- England
- Country
- United Kingdom
3 places with postcode CM21
| Place | County | Location |
|---|---|---|
| Allen's Green | Hertfordshire | 51.817, 0.150 |
| High Wych | Hertfordshire | 51.816, 0.119 |
| Sawbridgeworth | Hertfordshire | 51.817, 0.150 |
Near London
The nearest major city is London, about 39 km away.
Nearby postcodes
Frequently asked questions
Which places use postcode CM21?
Allen's Green, High Wych, Sawbridgeworth.
Which county and country is CM21 in?
Hertfordshire, England, United Kingdom.
What is the nearest major city to CM21?
London, about 39 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.