| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated December 2013 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated March 2002 | |
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated December 1991 | |
| England | Hertfordshire | Large | Terminated November 2002 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated December 1982 | |
| England | Hertfordshire | Large | Terminated December 1990 | |
| England | Hertfordshire | Large | Terminated December 1990 | |
| England | Hertfordshire | Large | Terminated December 1990 | |
| England | Hertfordshire | Large | Terminated February 2004 | |
| England | Hertfordshire | Small |