A fifth of the work force at the Olympic Park in east London live in the local area, new figures have shown.
Women are being encouraged to take up construction jobs
The Olympic Delivery Authority (ODA) study also revealed more than one in 10 of the 2,275 people working at the site were previously unemployed.
On Tuesday, the ODA announced plans to recruit 2,000 trainees, apprentices and people for work placements on the park and other venues for the 2012 Games.
A programme aimed at getting women into construction jobs was also launched.
Up to 10,000 construction workers will be employed at the peak of the contract in 2009/10, according to the ODA.
Olympics Minister Tessa Jowell said: "Everyone understands the physical legacy from hosting the Games in 2012, new sports facilities, a new urban park and new homes.
"But just as important is the legacy for thousands of people who will acquire skills enabling them to get jobs in the Olympic Park and then work for the rest of their lives."
TUC general secretary Brendan Barber said: "The London bid focused heavily on its promise to leave a legacy of skills in an area of high unemployment.
"Today's figures and skills strategy mark a small step towards meeting that commitment. The TUC will be looking for London 2012 to work closely with unions in the future to ensure that it fulfils those promises through to 2012 and beyond."
Prime Minister Gordon Brown welcomed the figures and said they showed that "construction of the site can be the catalyst for lasting social and economic change".