Tyler Cowen quoted this remarkable statistic about the lack of migration between the Republic of Ireland and Northern Ireland, despite rights of free movement between the two areas: “Just 2.1 percent of the population in Northern Ireland were born in the South, and just 1.3 percent living in the South were born in the North.”
The Isle of Man has relatively restrictive migration policies[efn_note]In the form of work permits: if you do not want to work in the Isle of Man, people from ROI and NI can come freely. This is not legal migration advice, etc.[/efn_note] with respect to people moving from the Republic of Ireland and Northern Ireland.
2.0% of the population in the Isle of Man were born in Northern Ireland, and 1.8% of the population living in the Isle of Man were born in the Republic of Ireland, according to the latest Isle of Man census.