| Inns | HS |
| 216-5 | 45 | Glamorgan v Hampshire | Sophia Gardens, Cardiff | 2019 |
| 193-7 | 49* | Glamorgan v Somerset | Sophia Gardens, Cardiff | 2003 |
| 186-5 | 46* | Glamorgan v Sussex | County Ground, Hove | 2010 |
| 184-9 | 49 | Glamorgan v Middlesex | Sophia Gardens, Cardiff | 2025 |
| 183-8 | 39 | Glamorgan v Surrey | Sophia Gardens, Cardiff | 2018 |
| 182-8 | 44 | Glamorgan v Gloucestershire | County Ground, Bristol | 2021 |
| 182-8 | 47 | Glamorgan v Essex | Sophia Gardens, Cardiff | 2024 |
| 181-9 | 35 | Glamorgan v Somerset | The Cooper Associates County Ground, Taunton | 2018 |
| 175 | 48 | Glamorgan v Essex | Sophia Gardens, Cardiff | 2023 |
| 175-6 | 43 | Glamorgan v Essex | The Cloud County Ground, Chelmsford | 2023 |
| 173-7 | 37 | Glamorgan v Somerset | The Cooper Associates County Ground, Taunton | 2022 |
| 172 | 40 | Glamorgan v Sussex | Sophia Gardens, Cardiff | 2025 |
| 170-7 | 45 | Glamorgan v Warwickshire | Edgbaston, Birmingham | 2007 |
| 170-5 | 43 | Glamorgan v Somerset | The SWALEC Stadium, Cardiff | 2008 |
| 168-6 | 38* | Glamorgan v Hampshire | The Ageas Bowl, Southampton | 2018 |
| 168 | 38 | Glamorgan v Middlesex | Brunton Memorial Ground, Radlett | 2022 |
| 167-9 | 38 | Glamorgan v Gloucestershire | College Ground, Cheltenham | 2018 |
| 166-5 | 43* | Glamorgan v Northamptonshire | County Ground, Northampton | 2004 |
| 166-8 | 47 | Glamorgan v Somerset | County Ground, Taunton | 2011 |
| 165-9 | 41 | Glamorgan v Warwickshire | Edgbaston, Birmingham | 2005 |
| 164-6 | 38 | Glamorgan v Hampshire | The SWALEC Stadium, Cardiff | 2014 |
| 162-7 | 43 | Glamorgan v Gloucestershire | Sophia Gardens, Cardiff | 2004 |
| 162-5 | 42 | Glamorgan v Gloucestershire | County Ground, Bristol | 2006 |
| 162-8 | 47 | Glamorgan v Gloucestershire | Seat Unique Stadium, Bristol | 2023 |
| 161-7 | 34 | Glamorgan v Hampshire | The Ageas Bowl, Southampton | 2014 |
| 160-6 | 40 | Glamorgan v Northamptonshire | County Ground, Northampton | 2006 |
| 160-9 | 44 | Glamorgan v Somerset | Sophia Gardens, Cardiff | 2018 |
| 157-8 | 49 | Glamorgan v Surrey | The Kia Oval, Kennington | 2023 |
| 155-9 | 40 | Glamorgan v Northamptonshire | County Ground, Northampton | 2009 |
| 154-6 | 46 | Glamorgan v Northamptonshire | The SWALEC Stadium, Cardiff | 2008 |
| 153-7 | 38 | Glamorgan v Gloucestershire | County Ground, Bristol | 2010 |
| 153-7 | 47 | Glamorgan v Northamptonshire | County Ground, Northampton | 2013 |
| 153-6 | 41* | Glamorgan v Surrey | Sophia Gardens, Cardiff | 2021 |
| 153 | 42 | Glamorgan v Somerset | The Cooper Associates County Ground, Taunton | 2023 |
| 152-6 | 41 | Glamorgan v Surrey | Sophia Gardens, Cardiff | 2019 |
| 151-7 | 46 | Glamorgan v Surrey | The SWALEC Stadium, Cardiff | 2011 |
