Twenty20 has proved a huge hit in England since its launch

All counties are now guaranteed four home ties over the six-week length of the tournament, which climaxes with the final at The Oval on 31 July.

John Carr, England and Wales Director of Cricket said: "Domestic cricket is enjoying a well-earned renaissance.

"Talented players, close matches and some of the largest crowds on record are supporting the Twenty20 Cup."

Carr added: "With an exciting international season already announced for 2005 we anticipate a huge rise in the interest around the game as a whole.

Full fixtures: County season 2005

"County cricket can capitalise on this upsurge in a sporting season where cricket will take centre stage."

The competition began with 45 matches in 2003, expanding to 52 in 2004.