The average age of the population in April 2016 was 37.4 years - up from 36.1 years in April 2011.
Census 2016 recorded a total of 6,034 same sex couples , with 4,226 same sex-civil partnerships.
The number of divorced people increased by 16,125 to 103,895 in 2016.
The number of Irish residents born outside Ireland continued to rise, standing at 810,406 in 2016.
The number of people who identified themselves as having no religion increased from 269,800 to 468,400, an increase of 73.6% and comprised of 9.8% of the population.
The number of households renting on census night amounted to 497,111, an increase of 22,323. Just under 1.7 million permanent housing units were occupied at the time of the census was, an increase of 48,257 units (2.9%) on 2011.