| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | Terminated April 2005 | |
| England | Hertfordshire | Large | Terminated March 2003 | |
| England | Hertfordshire | Large | Terminated December 1998 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated December 2014 | |
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | Terminated December 1982 | |
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | Terminated December 1998 | |
| England | Hertfordshire | Large | Terminated December 1998 | |
| England | Hertfordshire | Large | Terminated December 1991 | |
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | Terminated September 2004 | |
| England | Hertfordshire | Large | Terminated December 1995 | |
| England | Hertfordshire | Large | Terminated October 2003 | |
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | Terminated July 1995 | |
| England | Hertfordshire | Large | Terminated December 1983 |