| Extras |
| 21 | Northamptonshire v Glamorgan | County Ground, Northampton | 2004 |
| 21 | Hampshire v Glamorgan | The Rose Bowl, Southampton | 2010 |
| 20 | Somerset v Glamorgan | County Ground, Taunton | 2013 |
| 19 | Worcestershire v Glamorgan | County Ground, New Road, Worcester | 2005 |
| 19 | Middlesex v Glamorgan | The SWALEC Stadium, Cardiff | 2011 |
| 19 | Surrey v Glamorgan | The SWALEC Stadium, Cardiff | 2014 |
| 19 | Somerset v Glamorgan | Sophia Gardens, Cardiff | 2021 |
| 19 | Middlesex v Glamorgan | Merchant Taylors' School Ground, Northwood | 2023 |
| 17 | Warwickshire v Glamorgan | Edgbaston, Birmingham | 2003 |
| 17 | Sussex v Glamorgan | Arundel Castle Cricket Club Ground, Arundel | 2017 |
| 17 | Surrey v Glamorgan | Sophia Gardens, Cardiff | 2024 |
| 16 | Surrey v Glamorgan | The Brit Oval, Kennington | 2010 |
| 15 | Gloucestershire v Glamorgan | County Ground, Bristol | 2003 |
| 15 | Somerset v Glamorgan | County Ground, Taunton | 2006 |
| 15 | Essex v Glamorgan | The Ford County Ground, Chelmsford | 2010 |
| 15 | Northamptonshire v Glamorgan | Sophia Gardens, Cardiff | 2020 |
| 14 | Worcestershire v Glamorgan | County Ground, New Road, Worcester | 2004 |
| 14 | Gloucestershire v Glamorgan | Sophia Gardens, Cardiff | 2005 |
| 14 | Gloucestershire v Glamorgan | Sophia Gardens, Cardiff | 2006 |
| 14 | Northamptonshire v Glamorgan | The SWALEC Stadium, Cardiff | 2009 |
| 14 | Sussex v Glamorgan | The SWALEC Stadium, Cardiff | 2010 |
| 14 | Middlesex v Glamorgan | The SWALEC Stadium, Cardiff | 2010 |
| 14 | Middlesex v Glamorgan | Old Deer Park, Richmond | 2018 |
| 14 | Somerset v Glamorgan | The Cooper Associates County Ground, Taunton | 2023 |
| 14 | Surrey v Glamorgan | The Kia Oval, Kennington | 2025 |
| 13 | Somerset v Glamorgan | Sophia Gardens, Cardiff | 2003 |
| 13 | Warwickshire v Glamorgan | St Helen's, Swansea | 2005 |
| 13 | Gloucestershire v Glamorgan | The SWALEC Stadium, Cardiff | 2009 |
| 13 | Middlesex v Glamorgan | Old Deer Park, Richmond | 2010 |
| 13 | Gloucestershire v Glamorgan | County Ground, Bristol | 2014 |
| 13 | Surrey v Glamorgan | The SSE SWALEC Stadium, Cardiff | 2015 |
| 13 | Surrey v Glamorgan | Sophia Gardens, Cardiff | 2019 |
| 13 | Somerset v Glamorgan | Sophia Gardens, Cardiff | 2023 |
