| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| England | Hertfordshire | Large | ||
| England | Hertfordshire | Large | Terminated June 1996 | |
| England | Hertfordshire | Large | Terminated December 1981 | |
| England | Hertfordshire | Large | Terminated May 1994 | |
| England | Hertfordshire | Large | Terminated December 1991 | |
| England | Hertfordshire | Large | Terminated January 1995 | |
| England | Hertfordshire | Large | Terminated July 1997 | |
| England | Hertfordshire | Large | Terminated May 1994 | |
| England | Hertfordshire | Large | Terminated May 1994 | |
| England | Hertfordshire | Large | Terminated April 2006 | |
| England | Hertfordshire | Large | Terminated December 1990 | |
| England | Hertfordshire | Large | Terminated December 1983 | |
| England | Hertfordshire | Large | Terminated March 2010 | |
| England | Hertfordshire | Large | Terminated November 2007 | |
| England | Hertfordshire | Small | ||
| England | Hertfordshire | Large | Terminated September 2005 | |
| England | Hertfordshire | Large | Terminated August 2004 | |
| England | Hertfordshire | Large | Terminated July 2007 | |
| England | Hertfordshire | Large | Terminated July 2007 | |
| England | Hertfordshire | Large | Terminated May 2007 |