Overall the number of students achieving A-Levels (Grades A-E) has risen to 98.5 per cent compared to 98.3 per cent last year.
This figure places Conwy students ahead of the Welsh Average of 97.6 per cent.
But this year's set of results reveal a drop in fortunes for the county's most successful A-Level students.
The number of students gaining Grades A-C has fallen from 79.9 per cent in 2007 to 75.6 per cent this year, poised behind the All-Wales average of 75.8 per cent.
The most dramatic slump in A-Level student fortunes is for those achieving A Grade passes.
Their number has dropped from 26.3 per cent achieving top marks to just 19 per cent this year.
Cabinet Member for Lifelong Learning, Cllr Wyn Jones, and Chief Education Officer, Geraint James, in a joint statement said: "Once again this year Conwy County Borough Advanced Level students have performed exceptionally well, maintaining the high level of success seen in previous years.
"They exceeded the all Wales average for overall success by nearly one percentage point by achieving an impressive score of 98.5 per cent.
"These excellent results have been achieved as a result of hard work and dedication by the students themselves together with the committed and professional support of their teachers. We congratulate them all and wish all students every success in their future careers.
"We also acknowledge and celebrate the achievement of our students in other examinations, which include AS examinations, vocational courses and the Welsh Baccalaureate, although an authority analysis of these results is not yet available."