The study, carried out with more than 1,000 undocumented migrants, reveals that 84 per cent have lived in Ireland for over five years, and 21 per cent have lived here for 10 years.
There are an estimated 20,000-26,000 undocumented migrants living in Ireland, according to the centre. Of these nearly two-thirds are aged between 25-39. There are 2,000-6,000 children and young people growing up undocumented in Ireland.
Regularisation would give undocumented people the chance to legalise their immigration status and work legally in Ireland.