| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated July 1997 | |
| England | Hertfordshire | Large | Terminated December 1995 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated January 2009 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated May 2008 | |
| England | Hertfordshire | Large | Terminated July 1995 | |
| England | Hertfordshire | Large | Terminated September 2020 | |
| England | Hertfordshire | Large | Terminated December 1992 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated July 1995 | |
| England | Hertfordshire | Large | Terminated October 2002 | |
| England | Hertfordshire | Large | Terminated January 2006 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated June 2017 |