Irish population analysis in the context of "List of Irish counties by population"

Ireland is an island in the North Atlantic Ocean, in Northwestern Europe. Geopolitically, the island is divided between the Republic of Ireland (officially named Ireland – a sovereign state covering five-sixths of the island) and Northern Ireland (part of the United Kingdom – covering the remaining sixth). It is separated from Great Britain to its east by the North Channel, the Irish Sea, and St George's Channel. Ireland is the second-largest island of the British Isles, the third-largest in Europe, and the twentieth-largest in the world. As of 2022, the population of the entire island is just over 7 million, with 5.1 million in the Republic of Ireland and 1.9 million in Northern Ireland, ranking it the second-most populous island in Europe after Great Britain.

The geography of Ireland comprises relatively low-lying mountains surrounding a central plain, with several navigable rivers extending inland. Much of Ireland was woodland until the end of the Middle Ages. Today, woodland makes up about 10% of the island, compared with a European average of over 33%, with most of it being non-native conifer plantations. Its lush vegetation is a product of its mild climate, which is influenced by the Atlantic Ocean and thus very moderate, and winters are milder than expected for such a northerly area, although summers are cooler than those in continental Europe. Rainfall and cloud cover are abundant.

The Irish diaspora (Irish: Diaspóra na nGael) refers to ethnic Irish people and their descendants who live outside the island of Ireland.

The phenomenon of migration from Ireland is recorded since the Early Middle Ages, but it can be quantified only from around 1700. Since then, between 9 and 10 million people born in Ireland have emigrated. That is more than the population of Ireland itself, which at its historical peak was 8.5 million on the eve of the Great Famine. The poorest of them went to Great Britain, especially Liverpool. Those who could afford it went further, including almost 5 million to the United States.