- The population of the Greater Dublin Area, a region comprising Dublin and the counties of Meath, Kildare and Wicklow, is estimated to be 2.02 million, or 40.5% of the total population, as of April 2021.
- The population of Dublin as of April 2021 is estimated to be 1.43 million persons, 28.5% of the total population.
- The population of the Greater Dublin Area is set to grow to 2.2 million by 2031.
- The population of Dublin is set to grow to 1.8 million by 2036.
- The average age of the population of the Greater Dublin Area is 35.67, according to the 2016 census.
- Almost two-thirds of Ireland’s population now live in urban areas, up nearly 5% since 2011, figures based on the Census of April 2016. 44% of Ireland’s urban population lives in Dublin. The average population density in urban areas was 2,008 persons per km2 compared to 27 persons per km2 in rural areas.
- The population density of the State increased to 70 persons per km2 in 2016, up from 67 persons in 2011 and 62 persons per km2 recorded in 2006. The more densely populated areas are predominantly located within the Greater Dublin Area.
- In 2020, 63.65% of Ireland's total population lived in urban areas and cities.
- According to the 2016 census Dublin is home to nearly 200,000 non-Irish nationals, more than live in any other part of the country. 22% of those employed in Dublin are non-Irish nationals.
- There are 479,683 private households in Dublin with 34.8% being semi-detached houses.
- In Q2 2020 67.7% of all apartments completed were in Dublin. This figure rose slightly to 68.3% of all apartments completed in Q2 2021.