| Inns | HS |
| 240-6 | 85 | Northamptonshire v Warwickshire | Edgbaston, Birmingham | 2025 |
| 237-4 | 67 | Northamptonshire v Yorkshire | Headingley, Leeds | 2025 |
| 237-4 | 93 | Northamptonshire v Derbyshire | County Ground, Northampton | 2025 |
| 231-5 | 95* | Northamptonshire v Warwickshire | Edgbaston, Birmingham | 2018 |
| 224-5 | 78* | Northamptonshire v Gloucestershire | Campbell Park, Milton Keynes | 2005 |
| 223-4 | 83 | Northamptonshire v Durham | County Ground, Northampton | 2022 |
| 218-3 | 96 | Northamptonshire v Leicestershire | County Ground, Northampton | 2018 |
| 213-7 | 68 | Northamptonshire v Leicestershire | Uptonsteel County Ground, Leicester | 2022 |
| 211-6 | 74 | Northamptonshire v Warwickshire | County Ground, Northampton | 2022 |
| 210-7 | 62 | Northamptonshire v Leicestershire | Uptonsteel County Ground, Leicester | 2023 |
| 208-5 | 71 | Northamptonshire v Leicestershire | County Ground, Northampton | 2024 |
| 207-5 | 61 | Northamptonshire v Somerset | County Ground, Taunton | 2004 |
| 207-4 | 69 | Northamptonshire v Glamorgan | County Ground, Northampton | 2008 |
| 203-6 | 76 | Northamptonshire v Lancashire | Emirates Old Trafford, Manchester | 2024 |
| 203-5 | 63 | Northamptonshire v Durham | Banks Homes Riverside, Chester-le-Street | 2025 |
| 201-4 | 71* | Northamptonshire v Somerset | County Ground, Taunton | 2008 |
| 200-5 | 85 | Northamptonshire v Warwickshire | County Ground, Northampton | 2016 |
| 200-7 | 62 | Northamptonshire v Nottinghamshire | County Ground, Northampton | 2021 |
| 198-5 | 57 | Northamptonshire v Somerset | County Ground, Northampton | 2024 |
| 197-7 | 80 | Northamptonshire v Worcestershire | County Ground, Northampton | 2015 |
| 197-7 | 58 | Northamptonshire v Derbyshire | County Ground, Northampton | 2016 |
| 197-6 | 86 | Northamptonshire v Warwickshire | County Ground, Northampton | 2024 |
| 195-3 | 64 | Northamptonshire v Glamorgan | County Ground, Northampton | 2009 |
| 195-3 | 52* | Northamptonshire v Durham | Emirates Durham International Cricket Ground, Chester-le-Street | 2014 |
| 195-8 | 88 | Northamptonshire v Nottinghamshire | Trent Bridge, Nottingham | 2017 |
| 195-4 | 92* | Northamptonshire v Worcestershire | County Ground, New Road, Worcester | 2017 |
| 194-2 | 60 | Northamptonshire v Surrey | Edgbaston, Birmingham | 2013 |
| 194-6 | 84* | Northamptonshire v Derbyshire | The Central Co-op County Ground, Derby | 2025 |
| 193-8 | 56* | Northamptonshire v Worcestershire | County Ground, New Road, Worcester | 2015 |
| 193-7 | 50* | Northamptonshire v Warwickshire | Edgbaston, Birmingham | 2020 |
| 193-8 | 94 | Northamptonshire v Derbyshire | The Incora County Ground, Derby | 2024 |
| 192-6 | 69 | Northamptonshire v Derbyshire | County Ground, Northampton | 2014 |
| 191-5 | 53 | Northamptonshire v Somerset | County Ground, Taunton | 2005 |
| 191-5 | 62* | Northamptonshire v Somerset | County Ground, Taunton | 2006 |
| 190-3 | 73 | Northamptonshire v Worcestershire | County Ground, Northampton | 2006 |
| 190-5 | 59 | Northamptonshire v Worcestershire | Visit Worcestershire New Road, Worcester | 2025 |
| 189-3 | 62 | Northamptonshire v Worcestershire | County Ground, Northampton | 2019 |
| 187-9 | 39 | Northamptonshire v Worcestershire | County Ground, Northampton | 2018 |
| 186-7 | 92 | Northamptonshire v Derbyshire | The Incora County Ground, Derby | 2022 |
| 184-6 | 60 | Northamptonshire v Warwickshire | County Ground, Northampton | 2025 |
| 183-4 | 58* | Northamptonshire v Durham | County Ground, Northampton | 2013 |
| 183-7 | 61 | Northamptonshire v Leicestershire | Uptonsteel County Ground, Leicester | 2024 |
| 182-4 | 66* | Northamptonshire v Worcestershire | County Ground, Northampton | 2008 |
| 181-8 | 44* | Northamptonshire v Worcestershire | County Ground, Northampton | 2023 |
| 181-7 | 65 | Northamptonshire v Warwickshire | County Ground, Northampton | 2023 |
| 180-6 | 59 | Northamptonshire v Worcestershire | County Ground, New Road, Worcester | 2005 |
| 180-5 | 53 | Northamptonshire v Yorkshire | County Ground, Northampton | 2010 |
| 180 | 36 | Northamptonshire v Derbyshire | County Ground, Northampton | 2018 |
| 180-5 | 84 | Northamptonshire v Derbyshire | County Ground, Northampton | 2019 |
| 180-4 | 70* | Northamptonshire v Worcestershire | County Ground, New Road, Worcester | 2023 |
| 180-6 | 47* | Northamptonshire v Yorkshire | Headingley, Leeds | 2023 |
| 180-6 | 37 | Northamptonshire v Lancashire | Emirates Old Trafford, Manchester | 2025 |
| 179-8 | 95 | Northamptonshire v Leicestershire | County Ground, Northampton | 2014 |
| 179-6 | 69 | Northamptonshire v Derbyshire | County Ground, Northampton | 2017 |
| 179-3 | 73* | Northamptonshire v Derbyshire | The 3aaa County Ground, Derby | 2018 |
| 177-8 | 55* | Northamptonshire v Warwickshire | Edgbaston, Birmingham | 2021 |
| 177-5 | 51 | Northamptonshire v Nottinghamshire | County Ground, Northampton | 2023 |
| 177 | 32 | Northamptonshire v Lancashire | County Ground, Northampton | 2025 |
| 176-6 | 45 | Northamptonshire v Warwickshire | County Ground, Northampton | 2009 |
| 174-6 | 51 | Northamptonshire v Glamorgan | County Ground, Northampton | 2006 |
| 173-5 | 84 | Northamptonshire v Nottinghamshire | Trent Bridge, Nottingham | 2015 |
| 173-5 | 62 | Northamptonshire v Durham | County Ground, Northampton | 2021 |
| 171-4 | 94* | Northamptonshire v Gloucestershire | Campbell Park, Milton Keynes | 2008 |
| 171-3 | 57 | Northamptonshire v Essex | Edgbaston, Birmingham | 2013 |
| 171-6 | 51 | Northamptonshire v Somerset | County Ground, Northampton | 2020 |
| 171-7 | 53 | Northamptonshire v Leicestershire | Uptonsteel County Ground, Leicester | 2025 |
| 170-4 | 80 | Northamptonshire v Lancashire | County Ground, Northampton | 2010 |
| 170-7 | 52 | Northamptonshire v Warwickshire | County Ground, Northampton | 2017 |
| 170-7 | 50 | Northamptonshire v Worcestershire | County Ground, Northampton | 2020 |
| 169-5 | 47 | Northamptonshire v Lancashire | County Ground, Northampton | 2015 |
| 169-7 | 50 | Northamptonshire v Worcestershire | County Ground, New Road, Worcester | 2016 |
| 169-9 | 40* | Northamptonshire v Lancashire | County Ground, Northampton | 2023 |
| 169-4 | 44* | Northamptonshire v Worcestershire | County Ground, Northampton | 2024 |
| 168-5 | 61 | Northamptonshire v Leicestershire | Fischer County Ground, Grace Road, Leicester | 2016 |
| 167-9 | 44 | Northamptonshire v Warwickshire | Edgbaston, Birmingham | 2006 |
| 167-4 | 60 | Northamptonshire v Derbyshire | County Ground, Northampton | 2015 |
| 166-6 | 88 | Northamptonshire v Somerset | County Ground, Northampton | 2003 |
| 166-4 | 54* | Northamptonshire v Leicestershire | Grace Road, Leicester | 2010 |
| 166-7 | 50* | Northamptonshire v Leicestershire | County Ground, Northampton | 2021 |
| 165-7 | 43 | Northamptonshire v Yorkshire | Headingley, Leeds | 2014 |
| 165-9 | 76 | Northamptonshire v Yorkshire | County Ground, Northampton | 2014 |
| 165-8 | 41 | Northamptonshire v Leicestershire | Fischer County Ground, Grace Road, Leicester | 2017 |
| 164-6 | 43 | Northamptonshire v Warwickshire | Edgbaston, Birmingham | 2005 |
| 164-5 | 73 | Northamptonshire v Durham | County Ground, Northampton | 2010 |
| 163-7 | 64 | Northamptonshire v Yorkshire | County Ground, Northampton | 2016 |
| 163-5 | 56* | Northamptonshire v Derbyshire | County Ground, Northampton | 2024 |
| 162-5 | 61* | Northamptonshire v Glamorgan | County Ground, Northampton | 2004 |
| 162-7 | 48* | Northamptonshire v Warwickshire | Edgbaston, Birmingham | 2007 |
| 162-5 | 43* | Northamptonshire v Gloucestershire | County Ground, Bristol | 2008 |
| 162 | 48 | Northamptonshire v Gloucestershire | County Ground, Bristol | 2009 |
| 162-4 | 72 | Northamptonshire v Durham | Emirates Riverside, Chester-le-Street | 2017 |
| 162-9 | 40 | Northamptonshire v Durham | County Ground, Northampton | 2018 |
| 162-8 | 68* | Northamptonshire v Yorkshire | County Ground, Northampton | 2018 |
| 161 | 38* | Northamptonshire v Warwickshire | County Ground, Northampton | 2006 |
| 161-2 | 71* | Northamptonshire v Warwickshire | County Ground, Northampton | 2013 |
| 161-9 | 68 | Northamptonshire v Durham | County Ground, Northampton | 2016 |
| 161-8 | 84 | Northamptonshire v Nottinghamshire | Edgbaston, Birmingham | 2016 |
| 161 | 88 | Northamptonshire v Nottinghamshire | County Ground, Northampton | 2018 |
| 161-6 | 36* | Northamptonshire v Glamorgan | Edgbaston, Birmingham | 2020 |
| 161-7 | 53 | Northamptonshire v Durham | Seat Unique Riverside Ground, Chester-le-Street | 2023 |
| 160-7 | 58 | Northamptonshire v Worcestershire | County Ground, New Road, Worcester | 2008 |
| 160-6 | 61* | Northamptonshire v Nottinghamshire | Trent Bridge, Nottingham | 2011 |
| 160-5 | 48 | Northamptonshire v Warwickshire | Edgbaston, Birmingham | 2017 |
| 160-3 | 47 | Northamptonshire v Worcestershire | County Ground, Northampton | 2017 |
| 159-5 | 79* | Northamptonshire v Glamorgan | Sophia Gardens, Cardiff | 2003 |
| 159-4 | 39 | Northamptonshire v Derbyshire | County Ground, Derby | 2010 |
| 158-4 | 71 | Northamptonshire v Lancashire | County Ground, Northampton | 2017 |
| 158-7 | 35 | Northamptonshire v Warwickshire | County Ground, Northampton | 2020 |
| 158-1 | 78* | Northamptonshire v Durham | Emirates Riverside, Chester-le-Street | 2021 |
| 158-6 | 61 | Northamptonshire v Durham | Seat Unique Riverside Ground, Chester-le-Street | 2022 |
| 157-7 | 66* | Northamptonshire v Glamorgan | The SWALEC Stadium, Cardiff | 2009 |
| 157-3 | 68 | Northamptonshire v Glamorgan | County Ground, Northampton | 2013 |
| 157-7 | 40 | Northamptonshire v Lancashire | County Ground, Northampton | 2019 |
| 157-2 | 79 | Northamptonshire v Nottinghamshire | Trent Bridge, Nottingham | 2024 |
| 157-8 | 37 | Northamptonshire v Yorkshire | County Ground, Northampton | 2024 |
| 156-4 | 46 | Northamptonshire v Yorkshire | County Ground, Northampton | 2015 |
| 156-8 | 47 | Northamptonshire v Derbyshire | County Ground, Northampton | 2023 |
| 155-2 | 68* | Northamptonshire v Gloucestershire | County Ground, Bristol | 2006 |
| 155-7 | 59 | Northamptonshire v Warwickshire | Edgbaston, Birmingham | 2009 |
| 155-6 | 48 | Northamptonshire v Derbyshire | Queen's Park, Chesterfield | 2015 |
| 155-6 | 80 | Northamptonshire v Durham | Edgbaston, Birmingham | 2016 |
| 155-6 | 59* | Northamptonshire v Warwickshire | County Ground, Northampton | 2019 |
| 155-5 | 70 | Northamptonshire v Derbyshire | County Ground, Northampton | 2022 |
| 154-8 | 35 | Northamptonshire v Somerset | County Ground, Northampton | 2005 |
| 154-6 | 37 | Northamptonshire v Leicestershire | Fischer County Ground, Grace Road, Leicester | 2018 |
| 154-3 | 57 | Northamptonshire v Lancashire | County Ground, Northampton | 2022 |
| 153-7 | 39 | Northamptonshire v Warwickshire | County Ground, Northampton | 2012 |
| 153-6 | 51* | Northamptonshire v Warwickshire | Edgbaston, Birmingham | 2015 |
| 153-6 | 44* | Northamptonshire v Lancashire | Edgbaston, Birmingham | 2015 |
| 153-6 | 44 | Northamptonshire v Warwickshire | Edgbaston, Birmingham | 2019 |
| 153-9 | 36 | Northamptonshire v Worcestershire | County Ground, Northampton | 2021 |
| 153-6 | 57* | Northamptonshire v Lancashire | Emirates Old Trafford, Manchester | 2022 |
| 152-7 | 47 | Northamptonshire v Somerset | County Ground, Taunton | 2013 |
| 152-7 | 67 | Northamptonshire v Nottinghamshire | County Ground, Northampton | 2014 |
| 152-4 | 57 | Northamptonshire v Leicestershire | County Ground, Northampton | 2016 |
| 152-8 | 36 | Northamptonshire v Nottinghamshire | Trent Bridge, Nottingham | 2019 |
| 152-4 | 37* | Northamptonshire v Derbyshire | The Incora County Ground, Derby | 2023 |
| 152-9 | 27 | Northamptonshire v Worcestershire | County Ground, Northampton | 2025 |
| 151-6 | 64* | Northamptonshire v Somerset | County Ground, Northampton | 2006 |
| 151-7 | 38 | Northamptonshire v Yorkshire | Headingley, Leeds | 2010 |
| 150-9 | 67 | Northamptonshire v Worcestershire | County Ground, New Road, Worcester | 2003 |
| 150-6 | 72* | Northamptonshire v Nottinghamshire | Trent Bridge, Nottingham | 2006 |
| 150-8 | 35 | Northamptonshire v Warwickshire | Edgbaston, Birmingham | 2011 |
| 150-8 | 63 | Northamptonshire v Somerset | County Ground, Northampton | 2013 |
| 150-6 | 32 | Northamptonshire v Gloucestershire | County Ground, Northampton | 2020 |
