| Inns | HS |
| 200-6 | 43 | Middlesex v Essex | Lord's Cricket Ground, St John's Wood | 2010 |
| 190-7 | 48 | Middlesex v Hampshire | The Rose Bowl, Southampton | 2008 |
| 189-7 | 36 | Middlesex v Kent | The Kent County Cricket Ground, Beckenham | 2018 |
| 188-8 | 47 | Middlesex v Surrey | Lord's Cricket Ground, St John's Wood | 2022 |
| 186-7 | 39 | Middlesex v Somerset | Uxbridge Cricket Club Ground, Uxbridge | 2017 |
| 179-6 | 46 | Middlesex v Essex | The Cloudfm County Ground, Chelmsford | 2018 |
| 178-6 | 44 | Middlesex v Kent | Spitfire Ground, St Lawrence, Canterbury | 2024 |
| 177-6 | 41 | Middlesex v Essex | The Ford County Ground, Chelmsford | 2006 |
| 176-7 | 37 | Middlesex v Kent | Lord's Cricket Ground, St John's Wood | 2019 |
| 173-7 | 35 | Middlesex v Essex | County Ground, Chelmsford | 2003 |
| 173-7 | 43* | Middlesex v Essex | The Ford County Ground, Chelmsford | 2010 |
| 173-8 | 49 | Middlesex v Surrey | Lord's Cricket Ground, St John's Wood | 2011 |
| 173 | 48 | Middlesex v Kent | Spitfire Ground, St Lawrence, Canterbury | 2023 |
| 172-6 | 47 | Middlesex v Glamorgan | Brunton Memorial Ground, Radlett | 2022 |
| 171-5 | 48 | Middlesex v Sussex | Uxbridge Cricket Club Ground, Uxbridge | 2019 |
| 166-9 | 49 | Middlesex v Hampshire | The Rose Bowl, Southampton | 2006 |
| 166-2 | 48 | Middlesex v Glamorgan | The SWALEC Stadium, Cardiff | 2010 |
| 164-5 | 46 | Middlesex v Sussex | The PROBIZ County Ground, Hove | 2011 |
| 163-7 | 37 | Middlesex v Essex | The Cloudfm County Ground, Chelmsford | 2017 |
| 163-9 | 38 | Middlesex v Hampshire | The Ageas Bowl, Southampton | 2018 |
| 163-6 | 47 | Middlesex v Hampshire | The Ageas Bowl, Southampton | 2022 |
| 161-7 | 47* | Middlesex v Somerset | County Ground, Taunton | 2014 |
| 161-9 | 41 | Middlesex v Surrey | Lord's Cricket Ground, St John's Wood | 2017 |
| 161-5 | 47 | Middlesex v Gloucestershire | Uxbridge Cricket Club Ground, Uxbridge | 2017 |
| 160-7 | 34 | Middlesex v Gloucestershire | Uxbridge Cricket Club Ground, Uxbridge | 2018 |
| 160-6 | 44* | Middlesex v Somerset | Lord's Cricket Ground, St John's Wood | 2022 |
| 157-9 | 41 | Middlesex v Surrey | The Kia Oval, Kennington | 2012 |
| 156-5 | 40* | Middlesex v Gloucestershire | Brightside Ground, Bristol | 2016 |
| 155-7 | 42 | Middlesex v Kent | Mote Park, Maidstone | 2004 |
| 155-6 | 48* | Middlesex v Somerset | Lord's Cricket Ground, St John's Wood | 2010 |
| 155-8 | 46 | Middlesex v Sussex | The 1st Central County Ground, Hove | 2020 |
| 155-8 | 31 | Middlesex v Surrey | The Kia Oval, Kennington | 2022 |
| 154-6 | 41 | Middlesex v Kent | Lord's Cricket Ground, St John's Wood | 2010 |
| 153-6 | 31 | Middlesex v Hampshire | The Ageas Bowl, Southampton | 2015 |
| 151-9 | 40 | Middlesex v Hampshire | Merchant Taylors' School Ground, Northwood | 2014 |
| 150-5 | 32 | Middlesex v Essex | Lord's Cricket Ground, St John's Wood | 2011 |
| 150-5 | 46 | Middlesex v Essex | The Essex County Ground, Chelmsford | 2015 |
