English Heritage publish information on conservation areas in their annual publication Heritage Counts. The most recent edition, Heritage Counts 2007, quotes a figure of 9,374 conservation areas in England—a figure first quoted in Heritage Counts 2005—with the following qualification:
"After the publication of Heritage Counts 2005, it became apparent while updating the figures that English Heritage had not been informed of all conservation area designations and the data gave an inaccurate representation of the total number. Heritage Counts 2005 quoted a figure of 9,374 conservation areas as of April 2005. SHER 2002 had quoted a figure of 9,027 as of June 2002. Data from local authorities collected as part of the Best Value Performance Indicator regime give a different figure of 9,273 conservation areas in England in 2005-06.
As a result of these discrepancies, EH is investigating the feasibility of creating a national dataset of conservation areas and from 2006 has been conducting a pilot in the south east region. If this is deemed to be feasible and resources are available it may be possible to provide detailed statistics on conservation areas in a future edition of Heritage Counts”.