| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Small | Terminated December 1999 | |
| England | Hertfordshire | Large | Terminated November 2017 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated June 1998 | |
| England | Hertfordshire | Small | Terminated June 2019 | |
| England | Hertfordshire | Large | Terminated January 2016 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated July 2001 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated May 1994 | |
| England | Hertfordshire | Large | Terminated December 1998 | |
| England | Hertfordshire | Large | Terminated July 1995 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated July 2011 | |
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | Terminated June 2000 | |
| England | Hertfordshire | Small |