Evolution of Irish Population Density 1841-2002, by Dr. Alan Ferinhough . Wiki: “The population of Ireland in 2016 was approximately 6.6 million (4.75 million in the Republic of Ireland and 1.85 million in Northern Ireland). Although this is a significant growth over recent years, it is still below the record high of the early 1840s.” . “Between 1700 and 1840, Ireland experienced rapid population growth, rising from less than three million in 1700 to over eight million by 1841. In 1851, as the G