They hopped together for a minute on London's Millennium Bridge - famous for its initial wobbles.
Guinness World Records confirmed they beat the previous record, set by 551 spacehoppers in Bath in 2003.
"The bridge was pretty bouncy under all those people," said an event spokesman. "I think we thoroughly tested it."
An adjudicator from Guinness World Records was on hand to certify the new world record.
The previous record had been held by pupils and parents at St Stephen's School in Bath.