The number of police officers in Hounslow has fallen by 35 in the last three-and-a-half years, according to new figures.
There were 530 officers based in the borough in May 2010, statistics from the Metropolitan Police show, compared with 495 in January this year, the latest date for which figures are available.
London Assembly member Murad Qureshi, of the Labour Party, said the seven per cent fall showed London mayor Boris Johnson was failing to fulfil his pledge to increase police numbers.
"Despite promising us there would be 1,000 more police officers in London, the truth is the mayor has failed to deliver," said Mr Qureshi.
"We have lost over 3,000 police officers in London. In Hounslow we have lost 35 police officers and 59 PCSOs.
"The mayor has already admitted there may be flaws in his new community policing plan; the HMIC (police watchdog Her Majesty's Inspectorate of Constabulary) has reported that the Met now has the third lowest visibility of officers in the country. The mayor needs to act on his promise and get officers into our neighbourhoods."
However, Stephen Greenhalgh, London's deputy mayor for policing and crime, said a huge recruitment drive by the Met meant Hounslow was in line to get more officers.
"The Met is currently recruiting 5,000 police constables and that means London is going to see hundreds of new cops hitting the streets every month – with Hounslow getting an additional 74 officers by 2015 - a scenario most other forces could only dream of," said Mr Greenhalgh.
"We are committed to putting more officers on the streets, where and when they are needed, and, as recruitment continues, the Met will be 32,000-strong by next spring."
There were 523 police officers in Hounslow when Mr Johnson was first elected in May 2008. That fell to a low of 473 in March last year before rising slightly.
Between May 2010 and January this year, the total number of police officers across the capital has slumped by 3,111, or nine per cent, to just over 30,000.
