| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Hertfordshire | Large | Terminated October 2001 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated August 2006 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated January 2016 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated May 1994 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | Terminated April 2003 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated December 2014 | |
| England | Hertfordshire | Large | Terminated December 2014 | |
| England | Hertfordshire | Large | Terminated October 2017 |