CM21 postal code
United KingdomUpdated 2026-11-09Allen's Green, EnglandHertfordshireOutcode
Postal code details
3 placesCode
CM21
Place
Allen's Green
Region
England
County
Hertfordshire
Coordinates
51.8167, 0.15
Accuracy
3 / 6
Country
United Kingdom
Location
OpenStreetMap ↗
51.8167, 0.15© OpenStreetMap
Ad slot · 300×250
Places under this code
3| Place | Region | County | Coordinates |
|---|---|---|---|
| Allen's Green | England | Hertfordshire | 51.8167, 0.15 |
| High Wych | England | Hertfordshire | 51.816, 0.1188 |
| Sawbridgeworth | England | Hertfordshire | 51.8167, 0.15 |
Same code in other countries
0This code only appears in this country.
FAQ
Which city is CM21 in?
Allen's Green, England, United Kingdom.
What are the coordinates of CM21?
51.8167, 0.15
Is CM21 used in other countries?
No.
Updated 2026-11-09. Attribution in Data & license.