Twenty-nine English council areas have now seen a majority of their secondary schools become academies, according to new government figures.
The Department for Education said that as of this month 1,300 schools were now academies, with 40% of secondaries either operating as academies or in the process of changing.
Education secretary Michael Gove said academy conversions should leave teachers free to run schools and innovate in the classroom.
“Every child should be able to attend a good school,” he said.
“But we have inherited one of the most stratified and segregated education systems in the developed world.
“Thankfully, record numbers of weak schools are becoming academies this year, so we are giving more and more children opportunities that have historically been the preserve of those from wealthy backgrounds.”
The authorities where the majority of secondary schools are now academies are: Rutland CC, North East Lincolnshire Council; Bromley LBC; Solihull MBC; Sutton LBC; Bexley LBC; Swindon BC; Reading BC; Medway Council; Harrow LBC; Thurrock BC; Plymouth City Council; Southwark LBC; Gloucestershire CC; Buckinghamshire CC; Havering LBC; Cambridgeshire CC; Milton Keynes Council; Southend-on-Sea BC; Somerset CC; Darlington BC; Hillingdon LBC; Peterborough City Council; Kent CC; Barnet LBC; Bournemouth Council; Hackney LBC; North Somerset Council; and Westminster City Council.