Students' unions, trade unions and political parties have been participating in solidarity with migrants.
It comes after a series of protests and attacks directed against those seeking asylum in Dun Laoghaire and Ballybrack.
Councillor Hugh Lewis' family home was attacked earlier this month, and he says the support he has received has been overwhelmingly positive:
"It let me know what I already believed which was that the vast majority of people understand the issue quite well.
"We've a huge heritage of emigration in Dun Laoghaire town itself; it was the last port of call for many Irish emigrants that left these shores in the search of a better life.
"That was reflected today on the march and we had a great turn out from right across the community."
