Over 3,000 people in Leitrim claim to have no formal education, or left school at primary level.
The figure was revealed in the latest CSO statistics from the 2016 census, which recorded a three percent drop in the number of people who claimed they left school before they were teenagers.
Almost 38 percent of the county’s population has a third level degree, and women comprise the majority of college graduates at over 60%.
In Longford there was a three percent drop in the number of people who claimed to have no formal education between 2011’s census, and last year’s figures.
However, 4,300 people still claimed not to have reached secondary school level in their education.
The county also has the joint lowest number of third level graduates, with 32.5 percent of the population having successfully navigated university
In Roscommon just under six and a half thousand people claimed not to have made it beyond primary school education in Census 2016, a drop of two-and—half percent on figures for 2011.
Just over 35 per cent of the Roscommon’s population has a third level degree, while 187 people in Roscommon last year claimed to have a PHD.