The population of the whole island of Ireland is 6,380,661 as of July 2012. This is usually rendered as 6.4 million to make it easier to remember. The population of Éire, the republic of Ireland is 4,588,522 (4.6 million) and the population of Northern Ireland is 1, 810,000 (1.8 million)
Just to be clear it's Northern IRELAND not ISLAND as in the question; there is a political or land border between the two, they are not separated into two islands as, for example, New Zealand is.
The Republic of Ireland has a population of about 4,470,700 residents.Northern Ireland has a population of about 1,775,000 residents._______________Update (2013/14): About 6.45 million in the whole island (4.6m in the Republic and 1.85m in Northern Ireland).The Republic of Ireland has a population of about 4,470,700 residents.Northern Ireland has a population of about 1,775,000 residents.
The population of Scotland is around 5.3 million and the population of the Republic of Ireland is about 4.6 million.
The Republic of Ireland has a population of about 4,470,700 Northern Ireland has a population of about 1,789,000.
The population of the whole of Ireland is approximately 6.9 million people. This includes both the Republic of Ireland, with a population of around 4.9 million, and Northern Ireland, with a population of around 1.8 million.
The population of the Republic of Ireland is around 4.5 million compared to the UK's of around 60 million. The UK's population is around 13 time bigger than Ireland.
As of 2021, the population of the Republic of Ireland, which includes Southern Ireland, is estimated to be around 5 million people.
The most recent figures are from the 2006 census. In 2006 the Republic of Ireland's population was 4,239,848.
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In 1961 it was 2,818,341 in the Republic and 1,425,042 in the north.
Citizens of the Republic of Ireland can vote in elections there. Someone from Northern Ireland who is not a citizen of the Republic of Ireland does not have a vote in an election in the Republic of Ireland. Someone from the Republic of Ireland who is living in Northern Ireland and is still on the registrar of electors in the Republic of Ireland can vote there.Citizens of the Republic of Ireland can vote in elections there. Someone from Northern Ireland who is not a citizen of the Republic of Ireland does not have a vote in an election in the Republic of Ireland. Someone from the Republic of Ireland who is living in Northern Ireland and is still on the registrar of electors in the Republic of Ireland can vote there.Citizens of the Republic of Ireland can vote in elections there. Someone from Northern Ireland who is not a citizen of the Republic of Ireland does not have a vote in an election in the Republic of Ireland. Someone from the Republic of Ireland who is living in Northern Ireland and is still on the registrar of electors in the Republic of Ireland can vote there.Citizens of the Republic of Ireland can vote in elections there. Someone from Northern Ireland who is not a citizen of the Republic of Ireland does not have a vote in an election in the Republic of Ireland. Someone from the Republic of Ireland who is living in Northern Ireland and is still on the registrar of electors in the Republic of Ireland can vote there.Citizens of the Republic of Ireland can vote in elections there. Someone from Northern Ireland who is not a citizen of the Republic of Ireland does not have a vote in an election in the Republic of Ireland. Someone from the Republic of Ireland who is living in Northern Ireland and is still on the registrar of electors in the Republic of Ireland can vote there.Citizens of the Republic of Ireland can vote in elections there. Someone from Northern Ireland who is not a citizen of the Republic of Ireland does not have a vote in an election in the Republic of Ireland. Someone from the Republic of Ireland who is living in Northern Ireland and is still on the registrar of electors in the Republic of Ireland can vote there.Citizens of the Republic of Ireland can vote in elections there. Someone from Northern Ireland who is not a citizen of the Republic of Ireland does not have a vote in an election in the Republic of Ireland. Someone from the Republic of Ireland who is living in Northern Ireland and is still on the registrar of electors in the Republic of Ireland can vote there.Citizens of the Republic of Ireland can vote in elections there. Someone from Northern Ireland who is not a citizen of the Republic of Ireland does not have a vote in an election in the Republic of Ireland. Someone from the Republic of Ireland who is living in Northern Ireland and is still on the registrar of electors in the Republic of Ireland can vote there.Citizens of the Republic of Ireland can vote in elections there. Someone from Northern Ireland who is not a citizen of the Republic of Ireland does not have a vote in an election in the Republic of Ireland. Someone from the Republic of Ireland who is living in Northern Ireland and is still on the registrar of electors in the Republic of Ireland can vote there.Citizens of the Republic of Ireland can vote in elections there. Someone from Northern Ireland who is not a citizen of the Republic of Ireland does not have a vote in an election in the Republic of Ireland. Someone from the Republic of Ireland who is living in Northern Ireland and is still on the registrar of electors in the Republic of Ireland can vote there.Citizens of the Republic of Ireland can vote in elections there. Someone from Northern Ireland who is not a citizen of the Republic of Ireland does not have a vote in an election in the Republic of Ireland. Someone from the Republic of Ireland who is living in Northern Ireland and is still on the registrar of electors in the Republic of Ireland can vote there.
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The second most populated City in Ireland is Belfast, with a population of approximately 268,000! The second most populated City in the Republic of Ireland is Cork with a population of approximately 190,000. Making it the third largest city in Ireland behind Belfast and Dublin respectively!