Polls have closed in the bye-elections in Galway West and Dublin Central with turnout reported to be below levels seen in the last general election.
Polling stations opened at 7am and closed at 10pm.
The bye-elections are being held to fill Dáil seats vacated by President Catherine Connolly and former minister for finance Paschal Donohoe.
The electorate in Dublin Central has dropped by over 5,000 since the last general election, after a recent drive by An Coimisiún Toghcháin to remove duplicate names from the voting register, as well as those who have either emigrated or died.
A total of 57,932 people are registered to vote in Dublin Central, compared to 63,190 in 2024.
The electorate in Galway West stands at 104,167.
Fourteen candidates appeared on the ballot paper in Dublin Central, hoping to fill the seat vacated by former minister for finance Paschal Donohoe.
Mr Donohoe resigned his seat in November to take up a new position with the World Bank in Washington.
Seventeen candidates in Galway West are hoping to fill the vacancy created by Catherine Connolly's election as Uachtarán na hÉireann.
This is the fourth bye-election triggered by a TD moving to Áras an Uachtaráin, and the first since Erskine Childers' election in 1973.
It marks the first bye-election in the history of the State where those on the islands vote in tandem with the mainland.
Turnout in Dublin Central appeared to be on course to be lower than the general election.
The final estimated turnout for the constituency is 39.48%. It ranges from 52.8% in Drumcondra to 25% in the north inner city.
The final estimated turnout across the Galway West constituency was 45%.
The data is based on figures collected at a range of polling stations, collectively containing around half of the total number of ballot boxes in the constituency.
Maigh Cuilinn recorded a final turnout of 59%, followed by an Spidéal on 50%. Some 46% of voters in An Cheathrú Rua cast their ballots, while Cill Rónáin, on Inis Mór had a turnout of 39%.
On the west side of the River Corrib in Galway city, turnout ranged from 40% - 49%, in areas including Knocknacarra, Salthill and Bushy Park.
In contrast, the turnout on the eastern side of the city was lower, ranging from 36% in Renmore, to 42% in Tirellan.
Elsewhere, Oranmore recorded 47%, while Baile Chlair finished with a 43% showing.
A total of 196 ballot boxes will be brought to the count centre in Salthill tonight and early tomorrow morning, ahead of the start of the count at 9am.
Five boxes will be ferried across tonight from Inishbofin, Inis Mór, Inis Meáin and Inis Oírr.
Boxes from 21 polling stations in Dublin Central will be brought to the RDS on Dublin's southside for counting.
Given turnout in bye-elections is normally lower, and the fact the electorate is smaller, Dublin Central may produce a result sometime tomorrow evening.
A more protracted count is likely in Galway West - where a result might not come until Sunday.
Contingencies have been made for the count in Salthill to last beyond Sunday.
An Coimisiún Toghcháin piloted a new initiative in both constituencies where people can take a sticker to show that they have cast their ballot.
The stickers 'I'm a Voter' or 'Is Vótálaí mé' were available in eight polling stations in Dublin Central and one in Galway West, in Knocknacarra.
Additional reporting Pat McGrath, Samantha Libreri
