| 429 | Glamorgan v Surrey | The AMP Oval, Kennington | 2002 | a14362 |
| 373-7 | Glamorgan v Bedfordshire | Sophia Gardens, Cardiff | 1998 | a11253 |
| 356-7 | Glamorgan v Kent | St Helen's, Swansea | 2017 | a25576 |
| 356-3 | Glamorgan v Worcestershire | County Ground, New Road, Worcester | 2022 | a29419 |
| 348-8 | Glamorgan v Sussex | The 1st Central County Ground, Hove | 2019 | a27374 |
| 345-2 | Glamorgan v Durham | Feethams Cricket Ground, Darlington | 1991 | a7089 |
| 344-5 | Glamorgan v Lincolnshire | St Helen's, Swansea | 1994 | a8681 |
| 343-5 | Glamorgan v Northamptonshire | Sophia Gardens, Cardiff | 2023 | a30169 |
| 340-4 | Glamorgan v Lincolnshire | Lindum Sports Club Ground, Lincoln | 2004 | a15875 |
| 334-7 | Glamorgan v Hampshire | The Ageas Bowl, Southampton | 2017 | a25570 |
| 333-4 | Glamorgan v Dorset | Dean Park, Bournemouth | 2000 | a12785 |
| 331-7 | Glamorgan v Gloucestershire | County Ground, Bristol | 2019 | a27347 |
| 330-3 | Glamorgan v Sussex | The Brighton and Hove Jobs County Ground, Hove | 2014 | a23502 |
| 328-6 | Glamorgan v West Indies A | Eugene Cross Park, Ebbw Vale | 2006 | a17556 |
| 328-4 | Glamorgan v Lancashire | Penrhyn Avenue, Rhos-on-Sea, Colwyn Bay | 2011 | a21481 |
| 324-8 | Glamorgan v Essex | The Essex County Ground, Chelmsford | 2016 | a24835 |
| 323-7 | Glamorgan v Surrey | Sophia Gardens, Cardiff | 2019 | a27338 |
| 322-5 | Glamorgan v Oxfordshire | St Helen's, Swansea | 1993 | a8092 |
| 321-7 | Glamorgan v Kent | The SSE SWALEC Stadium, Cardiff | 2015 | a24166 |
| 320-5 | Glamorgan v Suffolk | The Victory Ground, Bury St Edmunds | 2005 | a16612 |
| 318-4 | Glamorgan v Staffordshire | Sophia Gardens, Cardiff | 1989 | a6109 |
| 318-3 | Glamorgan v Combined Universities | Sophia Gardens, Cardiff | 1995 | a9182 |
| 316-8 | Glamorgan v Essex | Sophia Gardens, Cardiff | 1994 | a8708 |
| 314-2 | Glamorgan v British Universities | FP Fenner's Ground, Cambridge | 1996 | a9803 |
| 312-9 | Glamorgan v Durham Cricket Board | Feethams Cricket Ground, Darlington | 2003 | a15094 |
| 308-7 | Glamorgan v Surrey | Woodbridge Road, Guildford | 2014 | a23427 |
| 308-7 | Glamorgan v Kent | Sophia Gardens, Cardiff | 2022 | a29319 |
| 307 | Glamorgan v Warwickshire | The Gnoll, Neath | 2023 | a30124 |
| 305-6 | Glamorgan v Worcestershire | Sophia Gardens, Cardiff | 2001 | a13551 |
| 304-8 | Glamorgan v Hampshire | County Ground, Southampton | 1997 | a10604 |
| 303-6 | Glamorgan v Leicestershire | St Helen's, Swansea | 2013 | a22798 |
| 302-6 | Glamorgan v Combined Universities | Sophia Gardens, Cardiff | 1988 | a5646 |
| 302-6 | Glamorgan v Sussex | The SSE SWALEC Stadium, Cardiff | 2016 | a24759 |
| 302-9 | Glamorgan v Middlesex | Sophia Gardens, Cardiff | 2018 | a26424 |
| 301-8 | Glamorgan v Essex | County Ground, Chelmsford | 1997 | a10659 |
| 301-8 | Glamorgan v Somerset | The Cooper Associates County Ground, Taunton | 2023 | a30162 |
| 300-8 | Glamorgan v Warwickshire | Edgbaston, Birmingham | 2002 | a14422 |
| 300-6 | Glamorgan v Unicorns | Garon Park, Southend-on-Sea | 2013 | a22674 |
| 299 | Glamorgan v Sussex | County Ground, Hove | 1998 | a11155 |
| 299-2 | Glamorgan v Essex | The Ford County Ground, Chelmsford | 2009 | a19769 |
| 299-3 | Glamorgan v Derbyshire | The Incora County Ground, Derby | 2023 | a30114 |
| 296-9 | Glamorgan v Durham | Trent Bridge, Nottingham | 2021 | a28530 |
| 295-4 | Glamorgan v Dorset | St Helen's, Swansea | 1990 | a6609 |
| 295-6 | Glamorgan v Northamptonshire | County Ground, Northampton | 2021 | a28466 |
| 294-4 | Glamorgan v Surrey | Ynysangharad Park, Pontypridd | 1999 | a12045 |
| 294-7 | Glamorgan v Kent | Spitfire Ground, St Lawrence, Canterbury | 2016 | a24773 |
| 293-5 | Glamorgan v Essex | Sophia Gardens, Cardiff | 2021 | a28528 |
| 292-6 | Glamorgan v Leicestershire | Penrhyn Avenue, Rhos-on-Sea, Colwyn Bay | 2008 | a19099 |
| 292-9 | Glamorgan v Hampshire | The Ageas Bowl, Southampton | 2019 | a27279 |
| 291-9 | Glamorgan v Kent | Sophia Gardens, Cardiff | 2006 | a17477 |
| 290-2 | Glamorgan v Hampshire | County Ground, Southampton | 1989 | a6022 |
| 289-6 | Glamorgan v Essex | Sophia Gardens, Cardiff | 2001 | a13653 |
| 289-6 | Glamorgan v Somerset | County Ground, Taunton | 2014 | a23482 |
| 289 | Glamorgan v Gloucestershire | The SSE SWALEC Stadium, Cardiff | 2016 | a24750 |
| 289 | Glamorgan v Somerset | The Cooper Associates County Ground, Taunton | 2018 | a26415 |
| 288-6 | Glamorgan v Essex | The SSE SWALEC Stadium, Cardiff | 2015 | a24179 |
| 287-8 | Glamorgan v Middlesex | Sophia Gardens, Cardiff | 1993 | a8113 |
| 286-8 | Glamorgan v Somerset | County Ground, Taunton | 2007 | a18192 |
| 285 | Glamorgan v Essex | Southchurch Park, Southend-on-Sea | 2000 | a12923 |
| 285-7 | Glamorgan v Yorkshire | Penrhyn Avenue, Rhos-on-Sea, Colwyn Bay | 2013 | a22601 |
| 285 | Glamorgan v Middlesex | Lord's Cricket Ground, St John's Wood | 2019 | a27363 |
| 283-3 | Glamorgan v Warwickshire | Edgbaston, Birmingham | 1976 | a1722 |
| 283-5 | Glamorgan v Sussex | Sophia Gardens, Cardiff | 1990 | a6638 |
| 281-6 | Glamorgan v Gloucestershire | The SWALEC Stadium, Cardiff | 2013 | a22629 |
| 281-7 | Glamorgan v Essex | The SSE SWALEC Stadium, Cardiff | 2017 | a25544 |
| 281-4 | Glamorgan v Sussex | Sophia Gardens, Cardiff | 2018 | a26461 |
| 280-8 | Glamorgan v Worcestershire | Sophia Gardens, Cardiff | 2002 | a14525 |
| 280-3 | Glamorgan v Middlesex | Lord's Cricket Ground, St John's Wood | 2013 | a22607 |
| 279-9 | Glamorgan v Worcestershire | St Helen's, Swansea | 1993 | a8154 |
| 279 | Glamorgan v Somerset | The Cooper Associates County Ground, Taunton | 2016 | a24832 |
| 278-6 | Glamorgan v Sussex | The 1st Central County Ground, Hove | 2023 | a30138 |
| 277-6 | Glamorgan v Derbyshire | Eugene Cross Park, Ebbw Vale | 1984 | a4148 |
| 277-5 | Glamorgan v Combined Universities | Sophia Gardens, Cardiff | 1992 | a7542 |
| 277-7 | Glamorgan v Essex | County Ground, Chelmsford | 1995 | a9173 |
| 277-9 | Glamorgan v Gloucestershire | Penrhyn Avenue, Rhos-on-Sea, Colwyn Bay | 2007 | a18261 |
| 277-7 | Glamorgan v Gloucestershire | Brightside Ground, Bristol | 2017 | a25481 |
| 277-8 | Glamorgan v Leicestershire | Uptonsteel County Ground, Leicester | 2021 | a28500 |
| 274-5 | Glamorgan v Worcestershire | County Ground, New Road, Worcester | 2005 | a16751 |
| 274 | Glamorgan v Kent | Spitfire Ground, St Lawrence, Canterbury | 2018 | a26435 |
| 272-4 | Glamorgan v Middlesex | Sophia Gardens, Cardiff | 2001 | a13722 |
| 271 | Glamorgan v Kent | Sophia Gardens, Cardiff | 1987 | a5242 |
| 271-6 | Glamorgan v Durham | Penrhyn Avenue, Rhos-on-Sea, Colwyn Bay | 1993 | a8081 |
| 271-4 | Glamorgan v Lancashire | Old Trafford, Manchester | 2010 | a20553 |
| 269-8 | Glamorgan v Sussex | Stradey Park, Llanelli | 1993 | a8131 |
| 269-6 | Glamorgan v Somerset | County Ground, Taunton | 2001 | a13597 |
| 269-2 | Glamorgan v Essex | Sophia Gardens, Cardiff | 2003 | a15206 |
| 266-6 | Glamorgan v Northamptonshire | Wellingborough School Ground, Wellingborough | 1975 | a1515 |
| 266 | Glamorgan v Lancashire | Penrhyn Avenue, Rhos-on-Sea, Colwyn Bay | 2001 | a13635 |
| 266 | Glamorgan v Middlesex | The SSE SWALEC Stadium, Cardiff | 2016 | a24779 |
| 266-8 | Glamorgan v Surrey | The Kia Oval, Kennington | 2018 | a26480 |
| 265-4 | Glamorgan v Middlesex | Lord's Cricket Ground, St John's Wood | 1996 | a9835 |
| 265-8 | Glamorgan v Leicestershire | Grace Road, Leicester | 2013 | a22696 |
| 264-3 | Glamorgan v Leicestershire | St Helen's, Swansea | 1992 | a7578 |
| 264 | Glamorgan v Gloucestershire | Sophia Gardens, Cardiff | 2018 | a26407 |
| 263-3 | Glamorgan v Northamptonshire | Wardown Park, Luton | 1992 | a7631 |
| 263-5 | Glamorgan v Hampshire | County Ground, Southampton | 2000 | a12895 |
| 262 | Glamorgan v Leicestershire | St Helen's, Swansea | 1984 | a4093 |
| 262-6 | Glamorgan v Gloucestershire | County Ground, Bristol | 2005 | a16860 |
| 262-8 | Glamorgan v Northamptonshire | Penrhyn Avenue, Rhos-on-Sea, Colwyn Bay | 2009 | a19880 |
| 260 | Glamorgan v Somerset | Sophia Gardens, Cardiff | 1978 | a2237 |
| 260-8 | Glamorgan v Nottinghamshire | St Helen's, Swansea | 2011 | a21442 |
| 259-7 | Glamorgan v Worcestershire | County Ground, New Road, Worcester | 1993 | a8153 |
| 259-5 | Glamorgan v Worcestershire | The SWALEC Stadium, Cardiff | 2010 | a20568 |
| 259 | Glamorgan v Somerset | Sophia Gardens, Cardiff | 2019 | a27295 |
| 256-8 | Glamorgan v Middlesex | Lord's Cricket Ground, St John's Wood | 2004 | a15911 |
| 256-9 | Glamorgan v Middlesex | Lord's Cricket Ground, St John's Wood | 2007 | a18202 |
| 255-7 | Glamorgan v Worcestershire | County Ground, New Road, Worcester | 1990 | a6528 |
| 255-5 | Glamorgan v Essex | County Ground, Chelmsford | 1996 | a9950 |
| 254-4 | Glamorgan v Essex | Southchurch Park, Southend-on-Sea | 1983 | a3756 |
| 254-5 | Glamorgan v Essex | Sophia Gardens, Cardiff | 1998 | a11126 |
| 254-5 | Glamorgan v Warwickshire | Sophia Gardens, Cardiff | 1999 | a12024 |
| 254-2 | Glamorgan v Essex | County Ground, Chelmsford | 2001 | a13523 |
| 254-6 | Glamorgan v Worcestershire | County Ground, New Road, Worcester | 2001 | a13694 |
| 253-4 | Glamorgan v Lancashire | St Helen's, Swansea | 1983 | a3662 |
| 252-7 | Glamorgan v Middlesex | Sophia Gardens, Cardiff | 1997 | a10467 |
| 251 | Glamorgan v Surrey | Sophia Gardens, Cardiff | 2000 | a12746 |
| 251-8 | Glamorgan v Essex | The Ford County Ground, Chelmsford | 2011 | a21424 |
| 251-9 | Glamorgan v Middlesex | Lord's Cricket Ground, St John's Wood | 2015 | a24221 |
| 250-9 | Glamorgan v Durham | Sophia Gardens, Cardiff | 2001 | a13665 |
| 250 | Glamorgan v Gloucestershire | St Helen's, Swansea | 2004 | a15925 |
| 250 | Glamorgan v Northamptonshire | County Ground, Northampton | 2004 | a15986 |
| 250-6 | Glamorgan v Kent | St Lawrence Ground, Canterbury | 2004 | a16037 |
| 250-9 | Glamorgan v Ireland | Sophia Gardens, Cardiff | 2006 | a17409 |
| 250-9 | Glamorgan v Somerset | County Ground, Taunton | 2012 | a22066 |
