| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated September 2005 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated December 1994 | |
| England | Hertfordshire | Large | Terminated February 2019 | |
| England | Hertfordshire | Large | Terminated December 1996 | |
| England | Hertfordshire | Large | Terminated October 2002 | |
| England | Hertfordshire | Large | Terminated August 2001 | |
| England | Hertfordshire | Large | Terminated June 1997 | |
| England | Hertfordshire | Large | Terminated August 2001 | |
| England | Hertfordshire | Large | Terminated February 2003 | |
| England | Hertfordshire | Large | Terminated June 1998 | |
| England | Hertfordshire | Large | Terminated November 2013 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated February 2019 |