Focus Ireland has said over 1,000 children under the age of eight are homeless, according to a preliminary report by the charity.
The charity has analysed the age profile of 307 families who entered emergency accommodation between March and October this year.
The preliminary report studied a sample of 630 children.
Almost two thirds of these were under the age of eight and almost 40% were aged four and younger.
Focus Ireland said if that was applied to the total number of homeless children in Ireland, it indicates over one thousand – 1,037 – are aged eight and under.
The charity said it had conducted the first analysis of the age profile of homeless children in Ireland.
The final report to be published next month will also examine the travel times between emergency accommodation and schools.
Tánaiste Joan Burton has said that any child living in temporary accommodation is “deeply regrettable”.