| 317-6 | Middlesex Second XI v Essex Second XI | The Ford County Ground, Chelmsford | set1961 |
| 300-9 | Essex Second XI v Middlesex Second XI | The Ford County Ground, Chelmsford | set1961 |
| 295-3 | Sussex Second XI v Surrey Second XI | Cricket Field Road, Horsham | set1988 |
| 290-8 | Unicorns A v Yorkshire Second XI | Centre Vale, Todmorden | set1985 |
| 285-6 | Gloucestershire Second XI v Hampshire Second XI | College Ground, Cheltenham | set2026 |
| 278-6 | Somerset Second XI v Marylebone Cricket Club Young Cricketers | Willis Lane, North Perrott | set1958 |
| 277-6 | Marylebone Cricket Club Young Cricketers v Somerset Second XI | Willis Lane, North Perrott | set1958 |
| 269-8 | Unicorns A v Leicestershire Second XI | Grace Road, Leicester | set2009 |
| 263-7 | Nottinghamshire Second XI v Northamptonshire Second XI | Wellingborough School Ground, Wellingborough | set1994 |
| 262-7 | Warwickshire Second XI v Northamptonshire Second XI | Stowe School Ground, Stowe | set1982 |
| 261-4 | Northamptonshire Second XI v Warwickshire Second XI | Stowe School Ground, Stowe | set1982 |
| 260-7 | Essex Second XI v Marylebone Cricket Club Young Cricketers | Brunton Memorial Ground, Radlett | set1969 |
| 258-7 | Worcestershire Second XI v Northamptonshire Second XI | County Ground, Northampton | set2024 |
| 256-6 | Warwickshire Second XI v Leicestershire Second XI | Kings Heath Cricket Club Ground, Kings Heath | set1959 |
| 255-7 | Durham Second XI v Unicorns A | Brandon Lane, Brandon | set1984 |
| 254-7 | Lancashire Second XI v Worcestershire Second XI | Smithy Lane, Northop Hall | set1962 |
| 254-7 | Unicorns A v Durham Second XI | Brandon Lane, Brandon | set1984 |
| 252-6 | Kent Second XI v Sussex Second XI | Tonbridge School Ground, Tonbridge | set1992 |
