For Glamorgan

410* – SA Northeast v Leicestershire at Leicester (GRace Road), 2022

313* – DL Lloyd v Derbyshire at Sophia Gardens, Cardiff, 2022

309* – SP James v Sussex at Colwyn Bay, 2000
299 – MJ Powell v Gloucestershire at Cheltenham College, 2006
287* – DE Davies v Gloucestershire at Rodney Parade, Newport, 1939
280* – RG Duckfield v Surrey at The Oval, 1936
259* – SP James v Nottinghamshire at Colwyn Bay, 1999

Against Glamorgan

322* – MB Loye for Northamptonshire at Northampton, 1998
313* – SJ Cook for Somerset at Sophia Gardens, Cardiff, 1990
309* – HD Ackerman for Leicestershire at Sophia Gardens, Cardiff, 2006
302* – WR Hammond for Gloucestershire at Bristol (County), 1934
302 – WR Hammond for Gloucestershire at Rodney Parade, Newport, 1939
286 – AN Petersen for Lancashire at Colwyn Bay, 2015
277* – RG Twose for Warwickshire at Edgbaston, 1994
274 – OJD Pope for Surrey at The Oval, 2021
270* – RWT Key for Kent at Sophia Gardens, Cardiff, 2009
268* – MA Atherton for Lancashire at Blackpool, 1999
268 – CDJ Dent for Gloucestershire at Bristol, 2015
266 – DJ Vilas for Lancashire at Colwyn Bay, 2019
262* – M van Jaarsveld for Kent at Sophia Gardens, Cardiff, 2005
261 – AG Prince for Lancashire at Colwyn Bay, 2015
257 – AH Bakewell for Northamptonshire at Swansea, 1933
254* – A Symonds for Gloucestershire at Abergavenny, 1995
252* – AG Dipper for Gloucestershire at Cheltenham (Victoria), 1923
252* – GA Hick for Worcestershire at Abergavenny, 1990
252 – W Larkins for Northamptonshire at Sophia Gardens, Cardiff, 1983
250* – John Langridge for Sussex at Hove, 1933
250 – MM Ali for Worcestershire at Worcester, 2013