| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated January 2006 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated February 2008 | |
| England | Hertfordshire | Large | Terminated April 2009 | |
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | Terminated February 2018 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | Terminated August 2015 | |
| England | Hertfordshire | Large | Terminated June 2003 | |
| England | Hertfordshire | Large | Terminated May 2008 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small |