| Postcode | Country | County | Type | Status |
|---|---|---|---|---|
| Wales | (pseudo) Wales | Large | Terminated December 1991 | |
| Wales | (pseudo) Wales | Large | Terminated December 1990 | |
| Wales | (pseudo) Wales | Small | ||
| Wales | (pseudo) Wales | Large | Terminated June 1997 | |
| Wales | (pseudo) Wales | Large | Terminated May 1994 | |
| Wales | (pseudo) Wales | Small | ||
| Wales | (pseudo) Wales | Large | Terminated January 2004 | |
| Wales | (pseudo) Wales | Large | Terminated May 2004 | |
| Wales | (pseudo) Wales | Large | Terminated December 2005 | |
| Wales | (pseudo) Wales | Large | Terminated December 2018 | |
| Wales | (pseudo) Wales | Large | Terminated February 2006 | |
| Wales | (pseudo) Wales | Large | Terminated December 1992 | |
| Wales | (pseudo) Wales | Large | Terminated June 1998 | |
| Wales | (pseudo) Wales | Large | Terminated February 2012 | |
| Wales | (pseudo) Wales | Large | Terminated June 1997 | |
| Wales | (pseudo) Wales | Large | Terminated December 1999 | |
| Wales | (pseudo) Wales | Large | Terminated June 1997 | |
| Wales | (pseudo) Wales | Large | Terminated July 2005 | |
| Wales | (pseudo) Wales | Large | Terminated March 2002 | |
| Wales | (pseudo) Wales | Large | Terminated December 2018 |