Demographics of Northern Ireland

Demographics of Northern Ireland
Population pyramid of Northern Ireland in 2020
Population	1,903,175 (2021 census)
Density	133 per km2
Life expectancy
• male	78.4 years[1]
• female	82.3 years
Age structure
0–14 years	19%
15–64 years	64%
65 and over	17%
Nationality
Major ethnic	White 97%
Minor ethnic	other ethnic groups 3%

Northern Ireland is the smallest of the four parts of the United Kingdom in terms of both area and population, containing 2.9% of the total population and 5.7% of the total area of the United Kingdom. It is the smaller of the two political entities on the island of Ireland by area and population, the other being the Republic of Ireland. Northern Ireland contains 27.1% of the total population and 16.75% of the total area of the island of Ireland.

The Belfast Metropolitan Area dominates in population terms, with over a third of the inhabitants of Northern Ireland.

When Northern Ireland was created, it had a Protestant majority of approximately two-to-one,^[2][3][4] unlike the Republic of Ireland, where Catholics were in the majority.^[5] The 2001 census was the first to show that the Protestant and other (non-Catholic) Christian share of the population had dropped below 50%, but 53.1% still identified as being from a Protestant or other Christian background. In the 2011 census, this dropped to 48.4%.^[6][4] In 2021, the recorded number of Catholics by background (45.7%) overtook the Protestant and other Christian by background share (43.48%), becoming the plurality, with no group in the overall majority.^{[7][8][9][10]}

Its people speak Irish (Gaelic), Ulster Scots and Ulster English which is itself heavily influenced by the Scots language of which Ulster Scots is a dialect. In addition the Ulster dialect of Irish (Gaelic) also has a closer connection to Scottish Gaelic than other Irish (Gaelic) dialects. This is both because of historic links with Scotland going back centuries, and because of settlements of lowland Scots Protestants in Ulster in the 17th century, such as the Plantation of Ulster.

Also unlike the Republic, a large proportion of people in Northern Ireland have a British national identity, although a significant minority identifies as Irish. Many people in Northern Ireland have a Northern Irish identity, whether in addition to a British or Irish identity or by itself.