19 major T20 county competitions have been held.

The titles have been won as follows: Leicestershire 3, Hampshire, Kent, Northamptonshire and Nottinghamshire 2, Essex, Lancashire, Middlesex, Somerset, Surrey, Sussex, Warwickshire and Worcestershire 1. Derbyshire, Durham, Glamorgan, Gloucestershire and Yorkshire have never won. No team has successfully defended its title.

Somerset have reached the final most times (five) and lost it the most times (four), including three years in succession (2009, 2010 and 2011). Derbyshire and Glamorgan have not yet reached the final.

Counties have reached the semi-finals (and thus Finals’ Day) as follows: Hampshire (including six years in succession from 2010–2015) and Lancashire 8, Somerset and Surrey 7, Nottinghamshire 6, Essex, Leicestershire and Sussex 5, Kent, Northamptonshire and Warwickshire 4, Gloucestershire 3, Durham, Glamorgan, Worcestershire and Yorkshire 2, Derbyshire and Middlesex 1.

The final winners were:

Twenty20 Cup

2003 Surrey beat Warwickshire‡ by nine wickets.
2004 Leicestershire beat Surrey‡ by seven wickets.
2005 Somerset beat Lancashire‡ by seven wickets.
2006 Leicestershire‡ beat Nottinghamshire by four runs.
2007 Kent‡ beat Gloucestershire by four wickets.
2008 Middlesex beat ‡Durham by eight wickets.
2009 Sussex beat Somerset‡ by 63 runs.

Friends Provident T20

2010 Hampshire beat Somerset‡ by virtue of losing fewer wickets.

Friends Life t20

2011 Leicestershire beat Somerset‡ by 18 runs.
2012 Hampshire‡ beat Yorkshire by ten runs.
2013 Northamptonshire‡ beat Surrey by 102 runs.

NatWest T20 Blast

2014 Warwickshire‡ beat Lancashire by four runs.
2015 Lancashire beat Northamptonshire‡ by 14 runs.
2016 Northamptonshire‡ beat Durham by four wickets.
2017 Nottinghamshire beat Warwickshire‡ by 22 runs.

Vitality Blast

2018 Worcestershire beat Sussex‡ by five wickets.
2019 Essex‡ beat Worcestershire by four wickets.
2020 Nottinghamshire‡ beat Surrey by six wickets.
2021 Kent‡ beat Somerset by 25 runs.

The team marked ‡ won the toss in the final.