| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | Terminated January 2001 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated February 2006 | |
| England | Hertfordshire | Large | Terminated April 2013 | |
| England | Hertfordshire | Large | Terminated March 2017 | |
| England | Hertfordshire | Large | Terminated August 2004 | |
| England | Hertfordshire | Small | Terminated October 2000 | |
| England | Hertfordshire | Small | Terminated October 2000 | |
| England | Hertfordshire | Large | Terminated March 2002 |