Nearly all, 96%, of the one million registrations came from UK residents, with 32% coming from Greater London, 27% from the south east and 41% from the rest of the UK.
Data shows there has been an even spread across all Olympic and Paralympic sports too, with more than 400,000 people registering an interest in Paralympic sports and at least 100,000 expressions of interest for each of the 26 Olympic sports.
Locog chairman Sebastian Coe and director of sport Debbie Jevans will today update the Association of Summer Olympic International Federations (ASOIF) on London 2012's progress, highlighting the success of its sign up programme.
"It should come as no surprise that the British public is so enthused by the prospect of world class sport coming to these shores, but it is pleasing to see that some of the lesser-known Olympic and Paralympic sports are also set to be well supported. I would urge people to continue to sign up and ensure they are in the front row for information between now and 2012," said Coe.
Olympic tickets will go on sale in spring 2011 via an application process.
Those who sign up to tickets.london2012.com will receive newsletters about sport events between now and 2012 and will be among the first to find out when tickets go on sale.
Locog is also developing a Fans in Front programme to ensure knowledgeable sports fans are seated together at the Games to create the best atmosphere.
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