| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | Terminated December 1992 | |
| England | Hertfordshire | Large | Terminated December 1992 | |
| England | Hertfordshire | Large | Terminated May 1994 | |
| England | Hertfordshire | Large | Terminated December 1995 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated June 1998 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated January 2006 | |
| England | Hertfordshire | Large | Terminated January 1995 | |
| England | Hertfordshire | Large | Terminated September 2003 | |
| England | Hertfordshire | Large | Terminated June 2008 | |
| England | Hertfordshire | Large | Terminated February 2003 |