United Kingdom
CM21 post code
Post code details
3 placesCode
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
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.
The data is unofficial and has known truncation; verify with the recipient and carrier for critical shipments. See data source & license → · Updated 2026-11-09. Attribution in