CO4 is in the county of Essex. It is 3km north-east of the city of Colchester, and contains Mile End, Greenstead, Langham, Braiswick, and Parson's Heath. CO4 is a postcode district, also known as an outcode or outbound code.
The below map shows where CO4 is, and the boundary of the CO4 postcode district:
Postal Boundaries © GEOLYTIX copyright and database right 2012
CO4 is in the county of Essex.
| Mile End | Suburb |
| Greenstead | Suburb |
| Langham | Village |
| Braiswick | Suburb |
| Parson's Heath | Suburb |
| Boxted | Village |
| Boxted | Village |
| Welshwood Park | Suburb |
| Langham Moor | Suburb |
| Boxted Cross | Village |
| Hornestreet | Hamlet |
| Workhouse Hill | Village |
| Langham Wick | Suburb |
Position of CO4 relative to nearby towns. Distance is measured from the centre of CO4 to the centre of the town.
Position of CO4 relative to nearby cities. Distance is measured from the centre of CO4 to the centre of the city.