| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated May 2007 | |
| England | Hertfordshire | Large | Terminated December 1998 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated February 2004 | |
| England | Hertfordshire | Large | Terminated May 2008 | |
| England | Hertfordshire | Large | Terminated December 2021 | |
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | Terminated January 2008 | |
| England | Hertfordshire | Large | Terminated February 2004 | |
| England | Hertfordshire | Large | Terminated October 2005 | |
| England | Hertfordshire | Large | Terminated November 2006 |