Some estimates have put the number of revellers supporting TeamGB and ParalympicsGB at the athletes parade today at close to a million.
A London Mayor's Office spokesman said the exact figure was unknown, but that it was in the hundreds of thousands.
Today also marked one of the largest events London has seen, the spokesman added.
Britain's equestrian team talk to ITV News about the parade crowds as Zara Phillips says it was an "honour" to be involved in London 2012.
Had the best time at the Olympic Parade today. Truly incredible crowds. Thank you all for coming! http://t.co/NbvxhICE
Huge thanks to all who came for today's parade. With support like that it's not surprising we had our greatest games ever #GoGB
We single handledly shutdown central London. Who wants to do it all again? http://t.co/nsOJ3NsE
Katherine Jenkins took to the stage in a glittering gold dress to perform the national anthem during the athletes parade.
Sebastian Coe said he was "happy" to be put forward for the role of British Olympic Association chairman.
Speaking after the parade of TeamGB and ParalympicsGB athletes, Lord Coe said:
I have been asked and I'm happy for my name to go forward. I was asked formally and on this day of all days why wouldn't you want to help.
I wouldn't presume anything but I was asked, I thought about it, and I have always had a huge debt of gratitude to the British Olympic Association.
They fought to allow me to go to Moscow, and actually everything I have done in the last few years might not have been possible had I not had that Olympic experience, so it's an organisation I have a deep, deep commitment to.
The BOA is a fantastic organisation.