Denbighshire Council said that early indications show approximately 98.9% of students have been successful in achieving the Level 3 threshold, which is an improvement on the previous year.
Most schools in the county have shown an increase in the number of students gaining A* and A grades.
Councillor Eryl Williams, Denbighshire's Cabinet Lead Member for Education, said: “We would like to congratulate all students on their individual results and we wish them every success in their chosen pathway.
“The results reflect the months of hard work and dedication of students and their teachers, in preparation for the examinations.
"Education remains a top priority in the county and I am extremely pleased to see the majority of schools in Denbighshire continue to improve performance.”
Staff and students at Ysgol Glan Clwyd in St Asaph are also celebrating excellent A-level results, maintaining the high standards of previous years.
When all grades including the Welsh Baccalaureate Qualification are considered: 27% achieved A*/A grades; 80% achieved A – C grades and 99% achieved A - E grades
Martin Davies, headteacher, said: "Students and staff deserve praise for their hard work and dedication over the last two years. The students should also be commended for their valuable contribution to extra-curricular activities and services to the community.
"Almost all students have obtained the grades or points score required for them to enter the university of their choice - attaining their personal, and often challenging targets.
"We would like to take this opportunity to wish all our students the very best as they take the next step in their careers, and thank their parents/guardians, who have given valuable support to their children and the school over the years."
Results at Denbigh High School this morning were described as "brilliant".
“I am absolutely delighted with the fantastic performance of our A level students” said headteacher Simeon Molloy.
“The results are brilliant again this year and include a raft of top performers, and for students doing two or more A levels a stunning 100% passed – our best ever results, with the top A*-C grades a very high proportion of the total grades. These results are a testament to the dedication and hard work of the students and the whole team around them. The pupils, teachers, our essential support staff, parents and family have all helped prove our motto of ‘Succeeding together – progressing with pride’.
"Congratulations to all and good luck in your future at university and college."
"With these results and our 6th form only ‘wing’ and networked supervised study area we are going from strength to strength. We hope that these results will encourage even more students to join Denbigh High School 6th form in partnership with the Dyffryn Clwyd Consortium.”
There were scenes of joy at the Ysgol Dinas Brân in Llangollen today as A-level students celebrated their results.
Overall the pass-rate at A level (grades A*-E) was an excellent 99%, with over half of all grades awarded at A*-B.
There were some outstanding individual successes.
Charlie Hackforth, sitting his A-levels a year early, achieved two A* grades in biology and history and an A grade in psychology. Charlie will now go on to study biological sciences at St Hilda’s College, Oxford University.
Early indicators suggest that the vast majority of students who applied to university have been successful in their applications.
A statement from the school said: "We congratulate all the students on these fantastic results. They have excelled themselves. We wish all of them the very best in their chosen future. A big thank you to all the staff who have taught and guided them too in these challenges and to all parents and carers for their help and support."
See full story in the Free Press