Cemeteries in parts of west London could be full within 20 years.
Getwestlondon's specialist data unit sent Freedom of Information requests to borough councils asking them to provide details of capacity in their graveyards.
And Harrow Council struck a deal with Brent to lay its new burials to rest in Carpenders Park cemetery as well.
The Watford site has 5,000 plots available with space for more but, even so, Brent predicted it could be full within 20 years.
Harrow did conduct 131 burials at its own seven sites last year. Some 82 of these were at Harrow Weald cemetery.
Harrow's Pinner New, Harrow, Eastcote Lane, Wealdstone, Roxeth Hill and Paines cemeteries also have no plots left.
Meanwhile Kensington & Chelsea Council said Gunnersbury cemetery - also known as New Kensington cemetery - could be full within five years, and City of Westminster cemetery, in Hanwell, within eight years.
Experts have been warning for years that towns and cities in Britain - and other developed countries - are facing a looming shortage of burial plots.
A BBC survey in 2013 found that almost half of England's cemeteries could run out of room within 20 years.
And a parliamentary report last year said the problem is "particularly acute" in the capital.
Dr Julie Rugg, a member of a cemetery research team at the University of York, said at the time: "It's not just a London or a big town problem, even small parish councils are wondering how they are going to cope when land runs out."
Crowded cities overseas, such as New York and Hong Kong, are also wrestling with the question of where to lay their dead to rest.