The proportion of pupils in 'good' or 'outstanding' primary schools in the borough leapt 17 percentage points between 2013/14 and the last school year to 87% - an increase matched only by schools in Bournemouth.
However, secondary schools in the borough have been knocked off their perch in the education watchdog's national performance table published on December 1.
The proportion of secondary pupils at 'good' or 'outstanding' schools fell from a perfect 100% to a still highly respectable 95%, according to the report by the chief inspector of chief inspector of education, children's services and skills.
The borough came 12th out of 150 local authorities in the secondary school league table and 72nd for primary schools.
Westminster was the top west London borough for primary schools, with a score of 95%, followed by Harrow (93%) and Ealing (92%).
Ealing secondary schools third most improved in England
Kensington & Chelsea were at the top of the heap for secondary schools, both receiving a perfect 100%. For Ealing, this represented an improvement of 25% from last year.
Beavers Community School, in Hounslow, which last Novemeber improved from 'requires improvement' to 'outstanding' , was singled out for praise within the report.
Leaders at the school were hailed as an example to others in a case study for monitoring and supporting the progress of all pupils.
The school has now become the leading partner in the London Diocese Board of Schools' Rapid Improvement Group, which focuses on continuing improvement for schools in all areas.
Councillor Tom Bruce, Hounslow Council's cabinet member for education, said: "This is something everyone at Beavers Community Primary School should be extremely proud of. Congratulations to all staff, pupils and parents.
"Learning in a safe and happy environment is critical to students reaching their potential and achieving their academic and vocational goals.
"Hounslow Council pledged to invest in education and provide a better choice of schools for our local children so they have the best start in life. This report shows that our schools are helping to provide brighter futures for our children."
How are schools where you live doing?
|Borough||Percentage of primary pupils at 'good' or 'outstanding' schools||Change from 2014||Percentage of secondary pupils at 'good' or 'outstanding' school||Change from 2014|
|Hammersmith & Fulham||85||0||89||7|
|Kensington & Chelsea||91||-3||100||0|
* figures according to Ofsted's 2014/15 annual report by chief inspector of education, children's services and skills