Narrowest Margin of Runs Defeat
| 1 run | by Warwickshire | Trent Bridge, Nottingham | 1984 | a4185 |
| 1 run | by Essex | Lord's Cricket Ground, St John's Wood | 1985 | a4570 |
| 1 run | by Glamorgan | Sophia Gardens, Cardiff | 1991 | a7006 |
| 1 run | by Middlesex | Trent Bridge, Nottingham | 1992 | a7558 |
| 1 run | by Surrey | Woodbridge Road, Guildford | 1995 | a9346 |
| 1 run | by Middlesex | Lord's Cricket Ground, St John's Wood | 1995 | a9366 |
| 1 run | by Middlesex | Lord's Cricket Ground, St John's Wood | 1997 | a10689 |
| 1 run | by Gloucestershire | Trent Bridge, Nottingham | 1998 | a11190 |
| 1 run | by Kent | Trent Bridge, Nottingham | 2001 | a13597 |
| 1 run | by Middlesex | Trent Bridge, Nottingham | 2003 | a15175 |
| 1 run | by Lancashire | Old Trafford, Manchester | 2005 | a16581 |
| 1 run | by Lancashire | Trent Bridge, Nottingham | 2008 | a19148 |
| 2 runs | by Derbyshire | Queen's Park, Chesterfield | 1975 | a1358 |
| 2 runs | by Northamptonshire | Town Ground, Worksop | 1980 | a2698 |
| 2 runs | by Gloucestershire | Batsford Road, Moreton-in-Marsh | 1987 | a5371 |
| 2 runs | by Durham | Trent Bridge, Nottingham | 2000 | a12664 |
| 2 runs | by Yorkshire | Trent Bridge, Nottingham | 2002 | a14240 |
| 2 runs | by Lancashire | Trent Bridge, Nottingham | 2011 | a21488 |
| 2 runs | by Glamorgan | St Helen's, Swansea | 2012 | a22069 |
| 3 runs | by Northamptonshire | Baker Perkins Sports Ground, Peterborough | 1971 | a526 |
| 4 runs | by Hampshire | County Ground, Southampton | 1991 | a6978 |
| 4 runs | by Glamorgan | Trent Bridge, Nottingham | 2005 | a16589 |
| 4 runs | by Durham | Riverside Ground, Chester-le-Street | 2009 | a19953 |
| 4 runs | by Leicestershire | Trent Bridge, Nottingham | 2010 | a20729 |
| 4 runs | by Lancashire | Old Trafford, Manchester | 2011 | a21372 |
| 5 runs | by Leicestershire | Trent Bridge, Nottingham | 1971 | a497 |
| 5 runs | by Middlesex | Trent Bridge, Nottingham | 1984 | a4136 |
| 5 runs | by Glamorgan | Trent Bridge, Nottingham | 1988 | a5698 |
| 5 runs | by Hampshire | May's Bounty, Basingstoke | 1988 | a5703 |
| 5 runs | by Essex | Edgbaston, Birmingham | 1989 | a6227 |
| 5 runs | by Northamptonshire | Wellingborough School Ground, Welingborough | 1991 | a7133 |
| 5 runs | by Middlesex | Lord's Cricket Ground, St John's Wood | 1993 | a8039 |
| 5 runs | by Warwickshire | Edgbaston, Birmingham | 1998 | a11167 |
| 6 runs | by Northamptonshire | County Ground, Northampton | 1979 | a2527 |
| 6 runs | by Lancashire | Trent Bridge, Nottingham | 1982 | a3417 |
| 6 runs | by Durham | Trent Bridge, Nottingham | 2008 | a19109 |
| 7 runs | by Glamorgan | Trent Bridge, Nottingham | 1977 | a2044 |
| 7 runs | by Surrey | Kennington Oval, Kennington | 1982 | a3410 |
| 7 runs | by Hampshire | County Ground, Southampton | 1990 | a6647 |
| 7 runs | by Northamptonshire | Campbell Park, Milton Keynes | 1997 | a10549 |
| 7 runs | by Durham | Trent Bridge, Nottingham | 2003 | a15162 |
| 8 runs | by Yorkshire | The Circle, Hull | 1972 | a741 |
| 8 runs | by Northamptonshire | Trent Bridge, Nottingham | 1976 | a1749 |
| 9 runs | by Derbyshire | Queen's Park, Chesterfield | 1971 | a501 |
| 9 runs | by Warwickshire | Edgbaston, Birmingham | 1985 | a4516 |
| 9 runs | by Glamorgan | Trent Bridge, Nottingham | 1998 | a11285 |
| 9 runs | by Worcestershire | Trent Bridge, Nottingham | 2007 | a18311 |
| 10 runs | by Leicestershire | Grace Road, Leicester | 1995 | a9280 |
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