| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | Terminated April 2005 | |
| England | Hertfordshire | Large | Terminated November 2015 | |
| England | Hertfordshire | Large | Terminated March 2003 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | Terminated July 2007 | |
| England | Hertfordshire | Large | Terminated August 2020 | |
| England | Hertfordshire | Large | Terminated August 2020 | |
| England | Hertfordshire | Large | Terminated July 2007 | |
| England | Hertfordshire | Large | Terminated January 2014 | |
| England | Hertfordshire | Large | Terminated May 2008 | |
| England | Hertfordshire | Large | Terminated May 2005 | |
| England | Hertfordshire | Large | Terminated September 2003 | |
| England | Hertfordshire | Large | Terminated January 2002 | |
| England | Hertfordshire | Large | Terminated October 2001 | |
| England | Hertfordshire | Large | Terminated February 2004 | |
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | Terminated January 2004 | |
| England | Hertfordshire | Large | Terminated February 2019 |