CM11 1 is a postcode sector within the CM11 postcode district which is within the CM Chelmsford postcode area.
The Royal Mail delivery office for the CM11 1 postal sector is the Billericay Delivery Office.
The area of the CM11 1 postcode sector is 6.51 square miles which is 16.86 square kilometres or 4,166.79 square acres.
In the year 2017 there were 244 house sales in the CM11 1 with the average house price being £664,839.
Waterways within the CM11 1 postcode sector include the River Crouch.
The CM11 1 postcode sector is crossed by a railway.
| C | M | 1 | 1 | - | 1 | X | X |
| C | M | 1 | 1 | Space | 1 | Letter | Letter |
| The CM11 1 Sector is within these Local Authorities |
| The CM11 1 Sector is within these Counties |
|
The CM11 1 Sector is within these Water Company Areas |
|
|---|
| Town | Type |
|---|---|
| Billericay | Town |
| Brock Hill | Village |
| Downham | Village |
| Town | Type |
|---|---|
| Ramsden Bellhouse | Village |
| Ramsden Heath | Village |
| Wickford | Town |
