Map
General Information
| Postal Area | Chelmsford |
| Postcode | CM1 1YB |
| User Type | Large (more than 25 items of mail per day) |
| Region | East of England |
| Country | England |
| Local authority | Chelmsford |
| Introduction Date | 1997-06-01 |
| Termination Date | 1998-12-01 |
Geographic Information
| Latitude | 51.7393590 |
| Longitude | 0.4697490 |
| Easting | 570622 |
| Northing | 207403 |
| Quality | Postcode sector mean, (mainly PO Boxes) |