| Inns | HS |
| 254-5 | 71 | Essex v Glamorgan | The Cloud County Ground, Chelmsford | 2022 |
| 244-7 | 71 | Essex v Sussex | The Cloud County Ground, Chelmsford | 2022 |
| 237-6 | 67 | Essex v Middlesex | Lord's Cricket Ground, St John's Wood | 2023 |
| 226-9 | 78 | Essex v Glamorgan | Sophia Gardens, Cardiff | 2023 |
| 225-6 | 69* | Essex v Middlesex | The Cloud County Ground, Chelmsford | 2023 |
| 211-4 | 86 | Essex v Middlesex | Lord's Cricket Ground, St John's Wood | 2018 |
| 209-5 | 81 | Essex v Somerset | Recreation Ground, Bath | 2011 |
| 209-7 | 70 | Essex v Hampshire | The Ageas Bowl, Southampton | 2023 |
| 206-3 | 86* | Essex v Gloucestershire | County Ground, Bristol | 2019 |
| 205-4 | 77 | Essex v Kent | The Ford County Ground, Chelmsford | 2009 |
| 204-4 | 49 | Essex v Gloucestershire | The Ford County Ground, Chelmsford | 2011 |
| 204-3 | 81* | Essex v Kent | The Essex County Ground, Chelmsford | 2016 |
| 201-6 | 40 | Essex v Kent | The Cloudfm County Ground, Chelmsford | 2018 |
| 199-7 | 75 | Essex v Surrey | The Kia Oval, Kennington | 2023 |
| 198-7 | 49 | Essex v Surrey | The Cloud County Ground, Chelmsford | 2022 |
| 197-5 | 81 | Essex v Sussex | The 1st Central County Ground, Hove | 2020 |
| 197-8 | 95 | Essex v Sussex | The 1st Central County Ground, Hove | 2022 |
| 196-6 | 49* | Essex v Sussex | The Ford County Ground, Chelmsford | 2006 |
| 196-7 | 69 | Essex v Gloucestershire | The Cloud County Ground, Chelmsford | 2023 |
| 195-6 | 48 | Essex v Glamorgan | The Essex County Ground, Chelmsford | 2014 |
| 195-8 | 64 | Essex v Surrey | The Cloudfm County Ground, Chelmsford | 2020 |
| 193-4 | 81* | Essex v Kent | Spitfire Ground, St Lawrence, Canterbury | 2014 |
| 193-6 | 77 | Essex v Somerset | The Cooper Associates County Ground, Taunton | 2024 |
| 192-9 | 47 | Essex v Northamptonshire | The Ford County Ground, Chelmsford | 2008 |
| 192-6 | 54 | Essex v Glamorgan | Sophia Gardens, Cardiff | 2018 |
| 191-6 | 54* | Essex v Glamorgan | The Ford County Ground, Chelmsford | 2010 |
| 190 | 47 | Essex v Sussex | The PROBIZ County Ground, Hove | 2012 |
| 190-2 | 74* | Essex v Kent | Spitfire Ground, St Lawrence, Canterbury | 2016 |
| 189-6 | 83 | Essex v Surrey | The Brit Oval, Kennington | 2006 |
| 189-6 | 64 | Essex v Kent | The Cloudfm County Ground, Chelmsford | 2019 |
| 188-5 | 63 | Essex v Sussex | County Ground, Hove | 2010 |
| 188-6 | 47* | Essex v Kent | Spitfire Ground, St Lawrence, Canterbury | 2022 |
| 188-5 | 86* | Essex v Somerset | The Cloud County Ground, Chelmsford | 2022 |
| 187-7 | 80 | Essex v Kent | St Lawrence Ground, Canterbury | 2009 |
| 187-6 | 82 | Essex v Nottinghamshire | Trent Bridge, Nottingham | 2013 |
| 187-7 | 52 | Essex v Glamorgan | The Essex County Ground, Chelmsford | 2015 |
| 187-7 | 53 | Essex v Somerset | The Cooper Associates County Ground, Taunton | 2021 |
| 187-3 | 46* | Essex v Kent | The Cloud County Ground, Chelmsford | 2024 |
| 186-6 | 75 | Essex v Surrey | The Cloudfm County Ground, Chelmsford | 2017 |
| 186-4 | 70* | Essex v Surrey | The Kia Oval, Kennington | 2019 |
| 186-6 | 67 | Essex v Middlesex | The Cloud County Ground, Chelmsford | 2022 |
| 186 | 72 | Essex v Somerset | The Cloud County Ground, Chelmsford | 2023 |
| 184-4 | 66 | Essex v Gloucestershire | County Ground, Bristol | 2010 |
| 184-2 | 81 | Essex v Lancashire | The Ford County Ground, Chelmsford | 2010 |
| 184-8 | 59 | Essex v Middlesex | Lord's Cricket Ground, St John's Wood | 2021 |
| 184 | 52 | Essex v Kent | The Cloud County Ground, Chelmsford | 2023 |
| 183-7 | 51 | Essex v Gloucestershire | College Ground, Cheltenham | 2014 |
| 183-7 | 67 | Essex v Surrey | The Kia Oval, Kennington | 2018 |
| 183-8 | 60 | Essex v Glamorgan | Sophia Gardens, Cardiff | 2025 |
| 182-5 | 68 | Essex v Hampshire | The Ageas Bowl, Southampton | 2013 |
| 182-9 | 35 | Essex v Gloucestershire | College Ground, Cheltenham | 2016 |
| 181-2 | 95* | Essex v Middlesex | Lord's Cricket Ground, St John's Wood | 2014 |
| 181 | 68 | Essex v Gloucestershire | The Essex County Ground, Chelmsford | 2015 |
| 181-7 | 45 | Essex v Middlesex | The Cloudfm County Ground, Chelmsford | 2018 |
| 180-8 | 39 | Essex v Kent | The Essex County Ground, Chelmsford | 2013 |
| 180 | 62 | Essex v Glamorgan | Ambassador Cruise Line Ground, Chelmsford | 2025 |
| 178-7 | 51 | Essex v Middlesex | The Ford County Ground, Chelmsford | 2006 |
| 178-5 | 61* | Essex v Warwickshire | The Essex County Ground, Chelmsford | 2014 |
| 178-7 | 47 | Essex v Somerset | The Cooper Associates County Ground, Taunton | 2016 |
| 178-9 | 54 | Essex v Sussex | The Cloud County Ground, Chelmsford | 2024 |
| 177-7 | 48* | Essex v Somerset | County Ground, Taunton | 2010 |
| 177-4 | 65* | Essex v Sussex | The Ford County Ground, Chelmsford | 2012 |
| 177-6 | 61 | Essex v Glamorgan | The Cloud County Ground, Chelmsford | 2023 |
| 177-4 | 82 | Essex v Sussex | The 1st Central County Ground, Hove | 2025 |
| 176-4 | 78 | Essex v Hampshire | The Ford County Ground, Chelmsford | 2012 |
| 176 | 68 | Essex v Somerset | The Essex County Ground, Chelmsford | 2015 |
| 176-8 | 36 | Essex v Sussex | The Essex County Ground, Chelmsford | 2016 |
| 176-8 | 78 | Essex v Surrey | The Cloud County Ground, Chelmsford | 2024 |
| 175-5 | 83 | Essex v Middlesex | County Ground, Chelmsford | 2003 |
| 175-7 | 52 | Essex v Surrey | The Ford County Ground, Chelmsford | 2007 |
| 174-6 | 51 | Essex v Kent | The Brit Oval, Kennington | 2010 |
| 174-7 | 69* | Essex v Hampshire | Utilita Bowl, Southampton | 2024 |
| 173-4 | 71 | Essex v Sussex | County Ground, Hove | 2003 |
| 173-6 | 56 | Essex v Kent | Spitfire Ground, St Lawrence, Canterbury | 2015 |
| 172-4 | 42* | Essex v Sussex | The Essex County Ground, Chelmsford | 2013 |
| 172-9 | 43 | Essex v Middlesex | The Cloudfm County Ground, Chelmsford | 2017 |
| 172-7 | 61 | Essex v Gloucestershire | College Ground, Cheltenham | 2018 |
| 172 | 55 | Essex v Kent | Ambassador Cruise Line Ground, Chelmsford | 2025 |
| 172-6 | 52 | Essex v Kent | Spitfire Ground, St Lawrence, Canterbury | 2025 |
| 171-4 | 37 | Essex v Sussex | The Ford County Ground, Chelmsford | 2007 |
| 171-8 | 62 | Essex v Warwickshire | Edgbaston, Birmingham | 2023 |
| 171 | 39 | Essex v Gloucestershire | Ambassador Cruise Line Ground, Chelmsford | 2025 |
| 170-8 | 38 | Essex v Middlesex | Lord's Cricket Ground, St John's Wood | 2013 |
| 170-4 | 57 | Essex v Surrey | The Kia Oval, Kennington | 2015 |
| 170-6 | 56 | Essex v Somerset | The Cloudfm County Ground, Chelmsford | 2017 |
| 170-8 | 49 | Essex v Hampshire | The Cloudfm County Ground, Chelmsford | 2018 |
| 170-2 | 60* | Essex v Hampshire | The Cloud County Ground, Chelmsford | 2024 |
| 169-6 | 53 | Essex v Surrey | The Ford County Ground, Chelmsford | 2009 |
| 169-6 | 50 | Essex v Hampshire | The Ageas Bowl, Southampton | 2017 |
| 169 | 46 | Essex v Kent | Spitfire Ground, St Lawrence, Canterbury | 2021 |
| 168-9 | 40 | Essex v Kent | The Ford County Ground, Chelmsford | 2011 |
| 168-5 | 38* | Essex v Northamptonshire | Edgbaston, Birmingham | 2013 |
| 168-5 | 59* | Essex v Sussex | The 1st Central County Ground, Hove | 2019 |
| 168-3 | 51 | Essex v Hampshire | The Ageas Bowl, Southampton | 2020 |
| 168-8 | 48 | Essex v Glamorgan | The Cloud County Ground, Chelmsford | 2024 |
| 167-9 | 98 | Essex v Kent | The Ford County Ground, Chelmsford | 2010 |
| 167-3 | 73 | Essex v Gloucestershire | The Ford County Ground, Chelmsford | 2010 |
| 167-9 | 44 | Essex v Hampshire | The Essex County Ground, Chelmsford | 2014 |
| 167 | 43 | Essex v Glamorgan | The Cloudfm County Ground, Chelmsford | 2018 |
| 167-9 | 52 | Essex v Kent | Spitfire Ground, St Lawrence, Canterbury | 2020 |
| 166-7 | 58 | Essex v Leicestershire | Grace Road, Leicester | 2004 |
| 166-5 | 42 | Essex v Surrey | The Essex County Ground, Chelmsford | 2014 |
| 166-8 | 47 | Essex v Kent | The Kent County Cricket Ground, Beckenham | 2017 |
| 165 | 67 | Essex v Gloucestershire | County Ground, Bristol | 2015 |
| 165-6 | 33 | Essex v Warwickshire | Edgbaston, Birmingham | 2015 |
| 165-4 | 45* | Essex v Lancashire | Emirates Riverside, Chester-le-Street | 2019 |
| 164-9 | 41 | Essex v Surrey | The Ford County Ground, Chelmsford | 2008 |
| 164-8 | 55 | Essex v Hampshire | The Rose Bowl, Southampton | 2008 |
| 164-1 | 94* | Essex v Hampshire | The Rose Bowl, Southampton | 2010 |
| 164-6 | 59 | Essex v Kent | Spitfire Ground, St Lawrence, Canterbury | 2013 |
| 164-6 | 74* | Essex v Middlesex | Lord's Cricket Ground, St John's Wood | 2019 |
| 163-7 | 54 | Essex v Hampshire | The Ford County Ground, Chelmsford | 2010 |
| 163-2 | 66* | Essex v Gloucestershire | The Essex County Ground, Chelmsford | 2014 |
| 163 | 42 | Essex v Kent | Spitfire Ground, St Lawrence, Canterbury | 2018 |
| 163-7 | 42 | Essex v Kent | The Kia Oval, Kennington | 2020 |
| 163-7 | 55 | Essex v Sussex | The 1st Central County Ground, Hove | 2023 |
| 162-3 | 81* | Essex v Hampshire | The Ford County Ground, Chelmsford | 2006 |
| 162-6 | 42 | Essex v Middlesex | The Ford County Ground, Chelmsford | 2010 |
| 162-7 | 74 | Essex v Hampshire | The Ford County Ground, Chelmsford | 2011 |
| 162 | 46 | Essex v Surrey | The Essex County Ground, Chelmsford | 2016 |
| 161 | 44 | Essex v Surrey | The Essex County Ground, Chelmsford | 2015 |
| 161-6 | 51 | Essex v Middlesex | Lord's Cricket Ground, St John's Wood | 2022 |
| 161-5 | 36 | Essex v Lancashire | Emirates Old Trafford, Manchester | 2022 |
| 160-5 | 53 | Essex v Kent | The Ford County Ground, Chelmsford | 2006 |
| 160-5 | 55 | Essex v Derbyshire | Edgbaston, Birmingham | 2019 |
| 160-9 | 37 | Essex v Middlesex | The Cloudfm County Ground, Chelmsford | 2021 |
| 160-6 | 30 | Essex v Middlesex | Lord's Cricket Ground, St John's Wood | 2025 |
| 159 | 49 | Essex v Hampshire | The Ford County Ground, Chelmsford | 2008 |
| 159-8 | 54 | Essex v Kent | The Rose Bowl, Southampton | 2008 |
| 159-3 | 51 | Essex v Glamorgan | The SWALEC Stadium, Cardiff | 2014 |
| 158-6 | 51 | Essex v Kent | The Ford County Ground, Chelmsford | 2012 |
| 157-9 | 59 | Essex v Sussex | The Ford County Ground, Chelmsford | 2010 |
| 157-8 | 42 | Essex v Middlesex | The Essex County Ground, Chelmsford | 2014 |
| 157-5 | 52 | Essex v Surrey | The Cloudfm County Ground, Chelmsford | 2018 |
| 157-5 | 76 | Essex v Kent | Spitfire Ground, St Lawrence, Canterbury | 2024 |
| 156-7 | 55 | Essex v Hampshire | The Rose Bowl, Southampton | 2010 |
| 156 | 68 | Essex v Hampshire | The Ageas Bowl, Southampton | 2015 |
| 156-8 | 58* | Essex v Middlesex | The Essex County Ground, Chelmsford | 2016 |
| 156-8 | 32 | Essex v Middlesex | Lord's Cricket Ground, St John's Wood | 2020 |
| 156 | 53 | Essex v Glamorgan | Sophia Gardens, Cardiff | 2024 |
| 156-9 | 41 | Essex v Middlesex | Ambassador Cruise Line Ground, Chelmsford | 2025 |
| 155-6 | 49 | Essex v Hampshire | The Rose Bowl, Southampton | 2003 |
| 155-5 | 78* | Essex v Middlesex | Lord's Cricket Ground, St John's Wood | 2011 |
| 155-6 | 38 | Essex v Middlesex | Lord's Cricket Ground, St John's Wood | 2012 |
| 155-5 | 44 | Essex v Surrey | The Kia Oval, Kennington | 2014 |
| 155-6 | 63* | Essex v Kent | Spitfire Ground, St Lawrence, Canterbury | 2023 |
| 154-7 | 62* | Essex v Middlesex | John Walker's Ground, Southgate | 2005 |
| 153-8 | 36 | Essex v Kent | St Lawrence Ground, Canterbury | 2011 |
| 153-8 | 45 | Essex v Gloucestershire | The Essex County Ground, Chelmsford | 2016 |
| 153-6 | 47 | Essex v Hampshire | The Ageas Bowl, Southampton | 2016 |
| 153-7 | 58* | Essex v Kent | Spitfire Ground, St Lawrence, Canterbury | 2019 |
| 153-6 | 36 | Essex v Glamorgan | Sophia Gardens, Cardiff | 2021 |
| 153 | 60 | Essex v Hampshire | The Ageas Bowl, Southampton | 2021 |
| 152-2 | 75* | Essex v Hampshire | The Cloud County Ground, Chelmsford | 2022 |
| 151-5 | 59 | Essex v Sussex | The Ford County Ground, Chelmsford | 2005 |
| 151-2 | 80* | Essex v Middlesex | The Ford County Ground, Chelmsford | 2009 |
| 151-7 | 39 | Essex v Sussex | The Ford County Ground, Chelmsford | 2011 |
| 151-6 | 59 | Essex v Middlesex | The Essex County Ground, Chelmsford | 2015 |
| 151-4 | 55* | Essex v Somerset | The Cloudfm County Ground, Chelmsford | 2021 |
| 150-9 | 57 | Essex v Leicestershire | Trent Bridge, Nottingham | 2006 |
