| 1 | 246 | K Newell & MTG Elliott | v Dorset | Dean Park, Bournemouth | 2000 | a12785 |
| 2 | 204 | SP James & A Dale | v Lincolnshire | St Helen's, Swansea | 1994 | a8681 |
| 3 | 259* | H Morris & MP Maynard | v Durham | Feethams Cricket Ground, Darlington | 1991 | a7089 |
| 4 | 245* | SA Northeast & WT Root | v Worcestershire | County Ground, New Road, Worcester | 2022 | a29419 |
| 5 | 135 | JWM Dalrymple & BJ Wright | v Derbyshire | The SWALEC Stadium, Cardiff | 2009 | a19822 |
| 6 | 186 | CA Ingram & TN Cullen | v Kent | Sophia Gardens, Cardiff | 2022 | a29319 |
| 7 | 117 | Javed Miandad & EW Jones | v Combined Universities | FP Fenner's Ground, Cambridge | 1983 | a3627 |
| 8 | 113 | MP Maynard & AG Wharf | v Northamptonshire | County Ground, Northampton | 2004 | a15986 |
| 8 | 113* | WT Root & M de Lange | v Surrey | Sophia Gardens, Cardiff | 2019 | a27338 |
| 9 | 87 | | v Lincolnshire | St Helen's, Swansea | 1974 | a1200 |
| 10 | 57 | LJ Carey & T van der Gugten | v Somerset | Sophia Gardens, Cardiff | 2019 | a27295 |