Almost 35 per cent of all babies born in the country between July and September last year were to unmarried parents.
There were 537 births in Donegal, 32% of them to unmarried parents. The birthrate in Donegal was slightly below the national average.
There were 298 deaths in the county over the same period.
Nationally, the data also highlights cancer as the leading cause of death among 45 to 74 years olds, while accidents and suicides account for the highest number of deaths in the 15 to 44 age group.