They are now looking likely to have another sell-out match on Saturday, when they play the French.
Will'Ilolahia, of the Tonga RWC Komiti 2011 supporters group, said it was a reflection of how patriotic Tongans were.
"We've been promoting and encouraging people to support big during the tournament since February," Mr'Ilolahia said.
The group has helped to sell thousands of tickets to games and organise buses to get supporters to each Tongan match.
And supporters are again being encouraged to fill the stands in Wellington on Saturday, when Tonga take on France in their last pool match.
By yesterday afternoon, about 31,000 tickets had been sold, and about 4000 were left.
Mr'Ilolahia said those tickets would fly out the door.
"It's their last game and so it's the last big chance to get behind the team, so we are expecting another sold-out game," he said.
Other countries that have had big turnouts for their games are New Zealand, Ireland and Samoa.
All of the All Blacks' games have had capacity crowds, and the Irish had two sold-out matches, against Russia and Italy.
Samoa have sold out three of their four matches, against Wales and then Fiji at the weekend. Only their game against Namibia, had empty seats.
Their match against South Africa tomorrow at North Harbour Stadium, was sold out months ago.