| 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 2002 | |
| England | Hertfordshire | Large | Terminated December 1998 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | Terminated March 2017 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated September 2006 | |
| England | Hertfordshire | Large | Terminated June 2000 | |
| England | Hertfordshire | Large | Terminated May 1994 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | Terminated May 1994 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | Terminated December 2010 | |
| England | Hertfordshire | Large |