| Aldershot | 1991/92 | Last season in the league |
| Aldershot | 1992/93 | First season in the Non-league |
| Barnet | 1990/91 | Last season in the non league |
| Barnet | 1991/92 | First season in the league |
| Barnet | 2000/01 | Last season in the league |
| Barnet | 2001/02 | First season back the Non-league |
| Barrow | 1971/72 | Last season in the league |
| Barrow | 1972/73 | First season in Non league |
| Bradford Park Avenue | 1969/70 | Last season in the league |
| Bradford Park Avenue | 1970/71 | First season in the Non-league |
| Cambridge United | 1969/70 | Last season in the non league |
| Cambridge United | 1970/71 | First season in the league |
| Cambridge United Carlisle | 2003/04 | Last season in the league |
| Carlisle | 2004/05 | First season in the league |
| Cheltenham Town | 1998//99 | Last season in the non league |
| Cheltenham Town | 1999/00 | First season in the league |
| Chester City | 1999/00 | Last season in the league |
| Chester City | 2000/01 | First season in the Non-league |
| Chester City | 2003/04 | Last season in Conference |
| Chester City | 2004/05 | First season back in the league |
| Colchester United | 1989/90 | Last season in the league |
| Colchester United | 1990/91 | First season in Non league |
| Colchester United | 1991/92 | Last season in the non league |
| Colchester United | 1992/93 | First season back the league |
| Darlington | 1988/89 | Last season in the league |
| Darlington | 1989/90 | First season in Non league |
| Darlington | 1990/91 | First season back the league |
| Doncaster | 1997/98 | Last season in the league |
| Doncaster | 1998/99 | First season in the Non-league |
| Doncaster | 2002/03 | Last season in the league |
| Doncaster | 2003/04 | First season back in the league |
| Exeter | 2002/03 | Last season in the league |
| Exeter | 2003/04 | First season in the non league |
| Gateshead | 1959/90 | Last season in the league |
| Gateshead | 1960/61 | First season in the Non-league |
| Halifax | 1992/93 | Last season in the league |
| Halifax | 1993/94 | First season in the Non-league |
| Halifax | 1997/98 | Last season in the non league |
| Halifax | 1998/99 | First season back the league |
| Halifax | 2001/02 | Last season in the league |
| Halifax | 2002/03 | First season back the Non-league |
| Hereford United | 1971/72 | Last season in the non league |
| Hereford United | 1972/73 | First season in the league |
| Hereford United | 1996/97 | Last season in the league |
| Hereford United | 1997/98 | First season back in the non-league |
| Hereford United | 2003/04 | Last season in the non league |
| Hereford United | 2003/04 | First season back the league |
| Lincoln | 1986/87 | Last season in the league |
| Lincoln | 1987/88 | First season in the non league |
| Lincoln | 1988/89 | First season back in the league |
| Maidstone United | 1988/89 | Last season in the non league |
| Maidstone United | 1990/91 | First season in the league |
| Maidstone United | 1991/92 | Last season in the league |
| Maidstone United | 1992/93 | First season back in the non league |
| Newport County | 1987/88 | Last season in the league |
| Newport County | 1988/89 | First season in the non league |
| Oxford United | 1961/62 | Last season in the non league |
| Oxford United | 1962/63 | First season in the league |
| Peterborough | 1959/60 | Last season in the non league |
| Peterborough | 1960/61 | First season in the league |
| Rushden + Diamonds | 2000/01 | Last season in the non league |
| Rushden + Diamonds | 2001/02 | First season in the league |
| Scarborough | 1986/87 | Last season in the non league |
| Scarborough | 1987/88 | First season in the league |
| Scarborough | 1998/99 | Last season in the league |
| Scarborough | 1999/00 | First season back in the non league |
| Southport | 1977/78 | Last season in the league |
| Southport | 1978/79 | First season in the Non league |
| Wigan Athletic | 1977/78 | Last season in the non league |
| Wigan Athletic | 1978/79 | First season in the league |
| Wimbledon | 1976/77 | Last season in the non league |
| Wimbledon | 1977/78 | First season in the league |
| Workington | 1976/77 | Last season in the league |
| Workington | 1977/78 | First season in the non league |
| Wycombe wanderers | 1992/93 | Last season in the non league |
| Wycombe wanderers | 1993/94 | First season in the league |
| Yeovil | 2002/03 | Last season in the non league |
| Yeovil | 2003/04 | First season in the league |
| York City | 2003/04 | Last season in the league |
| York City | 2004/05 | First season in the league |