Figures provided by schools across Lincolnshire show that results in the county have improved by 4%, up to 63%.
Lincolnshire County Council believe that the performance overall is “likely” to be well above the national average for maintained schools.
The figures released do not include results from county academies, and figures were not available for a breakdown of Lincoln schools.
However, two county schools, Caistor Grammar School and Horncastle Queen Elizabeth’s Grammar School, got 100% 5+ GCSEs at A* to C level.
Most schools made improvements in their A* to C grades over last year by at least 10% or higher.
Executive Councillor for Children’s Services, Councillor Patricia Bradwell said: “This is the seventh year of continuous improvement in Lincolnshire’s GCSE results and another excellent set of results.
“Our young people and the teachers, parents and carers have done fantastically well and their dedication and commitment has been rewarded.
“Congratulations to everyone involved but especially the students themselves.”