There are not enough school places in the capital according to a report by the Local Government Association.
It found that in one of the worst affected boroughs, Richmond, another 2,000 secondary school places will need to be created over the next 5 years to meet demand.
This video gives a detailed analysis of how to use the map - including how to find out where pupils who attend certain schools live, information about individual schools and easy access to their OFSTED reports as well as allowing users to search for schools in a certain ward or post code area.
Covering primary and secondary provision, including academies and free schools, the London Schools Atlas for the first time uses data to illustrate current patterns of demand for places at a pan-London level, rather than within boroughs alone.
The London Schools Atlas shows what areas pupils attending a particular school are drawn from and the extent of mobility between boroughs. It also provides information about the performance of schools.
It gives projected changes in demand from 2012 to 2017, helping people to get a clear picture of where pressure on school places might be in the future.
The Mayor hopes that council communities and parents will use the map to identify areas with highest demand for new schools - so they can set up new academies and free schools in those areas.
View the map here.
Earlier this month a report from the National Audit Office said that England needs more than a quarter of a million more school places by next year.
Today MPs have been visiting a school in east London to see the problem for themselves.
Sejal Karia reports.
Responding to today’s report by the NAO, Cllr Peter John, Executive Member for Education at London Councils says:
Schoolchildren could be taught in shifts - some in the morning, the rest in the evening - to cope with the demand for primary school places in the capital.
That's the drastic solution being considered by at least one London council, as it grapples with the problem.
More councils are expected to adopt similar measures at the start of the new school year this week.
A few months ago, we reported that classrooms are so full that 20,000 children didn't get into their first-choice school.