| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated December 1990 | |
| England | Hertfordshire | Large | Terminated January 1995 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated December 1996 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated December 1999 | |
| England | Hertfordshire | Large | Terminated May 1994 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | Terminated December 1991 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | Terminated May 1994 | |
| England | Hertfordshire | Large | Terminated May 2005 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated December 1990 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | Terminated April 2006 | |
| England | Hertfordshire | Small |