Ken Livingstone has been returned as Mayor of London for a second term, though he faces a hostile London Assembly at City Hall on the SE1 riverside.
The final declaration came at about 7.45pm on Friday evening.
City Hall was a hive of media activity on Friday, with live broadcasts by London Tonight, BBC London News, LBC and other TV and radio outlets.
The home of London's government will also be in the spotlight on Sunday night when the London region election results for the European Parliament are declared.
Commenting on the result of the mayoral election, Ken Livingstone said: "Here in London we have been delivering the four year record of a progressive administration. We could not have done what we've done for extra police and buses without the finance and support from government.
"The election was fought on the issue of improving public services. The outcome demonstrates that Londoners want to see another four years of more police, better buses and expanded public transport.
"I am proud that we have got the chance to carry on that work for the next four years, we did not believe that all we sought to do could be done in the first term, nor I suspect will it all be done in the second.
"I want to thank Anthony Mayer and his staff for their hard work. This election works because hundreds of thousands of people go out to make the democratic process happen."