Narrowest Margin of Runs Defeat
| 3 runs | by Somerset | The Rose Bowl, Southampton | 2010 | tt1893 |
| 4 runs | by Leicestershire | Trent Bridge, Nottingham | 2006 | tt461 |
| 5 runs | by Leicestershire | Grace Road, Leicester | 2008 | tt975 |
| 8 runs | by Durham | Riverside Ground, Chester-le-Street | 2009 | tt1257 |
| 9 runs | by Derbyshire | Trent Bridge, Nottingham | 2004 | tt87 |
| 11 runs | by Lancashire | Old Trafford, Manchester | 2009 | tt1241 |
| 14 runs | by Leicestershire | Grace Road, Leicester | 2006 | tt365 |
| 18 runs | by Yorkshire | Headingley, Leeds | 2003 | tt45 |
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