According to the CSO Vital Statistics 2011 report of the 74,650 births in Ireland in 2011 25,190 were to unmarried parents,  34% of all births. Over half of the births to unmarried parents were to parents at the same address.

Also it is worth noting that there is a significant drop in the number of births to teenagers 1,720 compared to 2,019 in 2010 .

Check out the rest of the report at www.cso.ie.