Most of the American presidents with Irish roots are Scots-Irish with ancestors who came over in the 17th and 18th centuries from Northern Ireland. These include:
- Andrew Jackson whose parents were born in Carrickfergus in Co Antrim.
- James Buchanan whose father was born in Ramelton in Co Donegal.
- Ulysses Grant whose grandfather was from Dergenagh, Co. Tyrone.
- William McKinley had roots in Dervock in Co. Antrim.
- Woodrow Wilson's grandfather was from Dergelt, near Strabane in Co Tyrone.
- Richard Nixon had ancestors from Ballymoney in Co Antrim and also from Carrickfergus in Co Antrim.
- Bill Clinton's Irish roots are not as clear cut. He is said to have a distant cousin in Kinawley in Co Fermanagh.
- The Bush presidents have roots from Rathfriland, Co Down as well as in Co Cork (in the Republic of Ireland) and possibly from Co Antrim as well.
|President Obama with Brian Cowan, Taoiseach of Ireland*|
- James Polk, whose great grandfather came over from Lifford in Co Donegal.
- John F. Kennedy with roots in Co Wexford and Bruff, Co Limerick and Kinawley, Co Cavan.
- Ronald Reagan's great grandfather was from Ballyporeen in Co Tipperary.
- President Barak Obama has ancestry from Moneygall in Co Offaly.