| Extras |
| 39 | Harrow Wanderers v Old Cheltonians | Harrow School Cricket Ground, Harrow-on-the-Hill | 2012 |
| 38 | Harrow Wanderers v Old Whitgiftians | Whitgift School, Croydon | 2003 |
| 38 | Harrow Wanderers v Old Westminsters | Vincent Square, Westminster | 2008 |
| 36 | Harrow Wanderers v Felsted Robins | Harrow School Cricket Ground, Harrow-on-the-Hill | 2005 |
| 35 | Harrow Wanderers v Old Brightonians | Harrow School Cricket Ground, Harrow-on-the-Hill | 2003 |
| 34 | Harrow Wanderers v Old Brightonians | Harrow School Cricket Ground, Harrow-on-the-Hill | 2015 |
| 33 | Harrow Wanderers v Felsted Robins | Felsted School Ground, Dunmow | 1998 |
| 30 | Harrow Wanderers v Marlborough Blues | Harrow School Cricket Ground, Harrow-on-the-Hill | 1994 |
| 30 | Harrow Wanderers v Sherborne Pilgrims | Harrow School Cricket Ground, Harrow-on-the-Hill | 2002 |
| 29 | Harrow Wanderers v Charterhouse Friars | Harrow School Cricket Ground, Harrow-on-the-Hill | 1996 |
| 29 | Harrow Wanderers v Shrewsbury Saracens | Harrow School Cricket Ground, Harrow-on-the-Hill | 1997 |
| 28 | Harrow Wanderers v Shrewsbury Saracens | Shrewsbury School, Shrewsbury | 1996 |
| 27 | Harrow Wanderers v Haileybury Hermits | Haileybury College Ground, Hertford | 1991 |
| 27 | Harrow Wanderers v Bradfield Waifs | Bradfield College, Reading | 1996 |
| 27 | Harrow Wanderers v Haileybury Hermits | Harrow School Cricket Ground, Harrow-on-the-Hill | 1998 |
| 27 | Harrow Wanderers v Oundle Rovers | Oundle School Ground, Oundle | 1999 |
| 27 | Harrow Wanderers v Repton Pilgrims | Harrow School Cricket Ground, Harrow-on-the-Hill | 2004 |
| 25 | Harrow Wanderers v Old Malvernians | Harrow School Cricket Ground, Harrow-on-the-Hill | 1996 |
| 25 | Harrow Wanderers v Old Cheltonians | College Ground, Cheltenham | 2014 |
| 24 | Harrow Wanderers v Old Malvernians | Malvern College Ground, Malvern | 1982 |
| 24 | Harrow Wanderers v Sherborne Pilgrims | Sherborne School, Sherborne | 1985 |
| 24 | Harrow Wanderers v Old Cholmeleians | Harrow School Cricket Ground, Harrow-on-the-Hill | 1992 |
| 24 | Harrow Wanderers v Old Wellingtonians | Harrow School Cricket Ground, Harrow-on-the-Hill | 2001 |
| 24 | Harrow Wanderers v Repton Pilgrims | Repton School Ground, Repton | 2003 |
| 24 | Harrow Wanderers v Old Brightonians | Brighton College Ground, Brighton | 2006 |
| 24 | Harrow Wanderers v Old Malvernians | North End Lane, Malvern | 2021 |
| 23 | Harrow Wanderers v Radley Rangers | Radley College Bigside Ground, Abingdon | 1968 |
| 23 | Harrow Wanderers v Downside Wanderers | Harrow School Cricket Ground, Harrow-on-the-Hill | 1990 |
| 23 | Harrow Wanderers v Repton Pilgrims | Repton School Ground, Repton | 2001 |
| 23 | Harrow Wanderers v Shrewsbury Saracens | Harrow School Cricket Ground, Harrow-on-the-Hill | 2001 |
| 23 | Harrow Wanderers v Old Cranleighans | Jubilee, Cranleigh School | 2007 |
| 23 | Harrow Wanderers v Old Wykehamists | Ridding Field, Winchester | 2012 |
| 23 | Harrow Wanderers v Old Alleynians | Dulwich College Ground, Dulwich | 2022 |
| 23 | Harrow Wanderers v Stowe Templars | Stowe School Ground, Stowe | 2025 |
