Turnout in the two referendums has been low and only hit 50% in some areas, reports suggest.
Voters were asked to decide on the Constitutional definitions of care and the family.
Polling closed at 10pm this evening and ballots will be counted tomorrow morning from 9am.
If turnout does not exceed 50% it will be one of the lowest turnouts in recent history.
In 2015, 60.5% of people turned out to vote on gay marriage and in 2018, 64.1% voted on whether to legalise abortion.
However, it would exceed the 43.8% turnout in 2018 who turned out to vote on the issue of blasphemy.
Main image: Voters leave a polling station in Malahide, County Dublin. Image by: AP Photo/Peter Morrison.