| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated December 1992 | |
| England | Hertfordshire | Large | Terminated June 1998 | |
| England | Hertfordshire | Large | Terminated April 2005 | |
| England | Hertfordshire | Large | Terminated June 1999 | |
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated May 2011 | |
| England | Hertfordshire | Large | Terminated December 1999 | |
| England | Hertfordshire | Large | Terminated December 1994 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | Terminated June 1996 | |
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated December 2002 | |
| England | Hertfordshire | Large | Terminated January 1995 |