Government figures show there were more than 10,514 people in emergency accommodation in October, 117 more than the previous month.
October figures show there were 6,688 adults, 1,733 families and 3,826 children.
The Department of Housing says there was a decrease of 23 families and 47 children in comparison to September's figures.
In a statement the department said the number of families presenting to homeless services in the Dublin region decreased in October to 158, compared to 169 in September.
It continued: "There were 213 fewer presentations of families to homeless services in the Dublin region in first nine months of the year in comparison with 2018."
The statement said that the increase in adults was expected following the introduction of additional emergency beds recently.
Also published this evening was the department’s quarterly report on homelessness. It shows a continued increase in the number of exits from homelessness.
Minister for Housing Eoghan Murphy said: "The number of people in emergency accommodation is unacceptably high and we must continue to implement every necessary support, whilst also driving the continuing increase in the supply of new homes."
The Official Winter Rough Sleeper Count, which was carried out on the night of 26 November into the morning of 27 November 2019, shows a 41% decrease on winter 2018.
According to the report, a total of 92 people were recorded as rough sleeping across the Dublin region this year compared to 152 in 2018.
The figures also show that a total of 1,564 adults and their children moved from emergency accommodation into tenancies, an increase of 10% on the same period last year.
There was also an increase in the number of people who exited homelessness into local authority and Approved Housing Bodies accommodation.