In an appreciation measure used by the BBC the landmark series, made by BBC Cymru Wales jointly with the Open University in Wales, scores top marks so far in 2012.
Taking the whole of 2011 into account, audiences say they have enjoyed it more than any series across the BBC network except Frozen Planet, also produced in partnership by the BBC and the OU.
The series has followed Welsh history from more than 30,000 years ago. The final episode, to be screened on Monday March 26, brings the story up to the present day.
Elis Owen, Head of Commissioning for BBC Cymru Wales, said: "The reaction to The Story of Wales has exceeded every expectation and we are delighted that so many of the Welsh viewing public have taken such an interest in the story of our nation.
"We'd like to thank Huw Edwards and the Green Bay Media production team for delivering this ground-breaking series."
The series is screened on BBC One Wales and is available for those outside Wales on Sky channel 972, Freesat 964, or Virgin 864.
BBC Radio Wales is broadcasting an accompanying six-week series Histories of Wales, looking at themes such as radicalism, migration, the family and war, with presenters including former First Minister Rhodri Morgan, from Sunday 19 February.
The Open University offers Welsh history course: Small country, big history:themes in the history of Wales (A182).