More than 3,000 women who gave Republic of Ireland addresses had abortions in England and Wales last year, according to figures from the UK Department of Health.
Another 724 women gave addresses in Northern Ireland.
The figures are contained in a report published by the department.
Ten girls younger than 16 travelled to England and Wales last year for a legal abortion.
It said 3,265 women gave a Republic of Ireland address and women from the island of Ireland accounted for 83% of legal abortions provided to non-residents of the UK in 2016.
The department says this compares to 3,451 who gave an address in the Republic and 833 who gave an address in the North in 2015.
The report shows that 1,175 women gave addresses in Dublin and 241 had addresses in Cork, with 130 giving an address in Kildare.
Meanwhile, a coalition of groups campaigning to repeal the Eighth Amendment will hold rallies in Dublin, Cork, Galway and Tralee on Saturday.