The polls in the referendum on the Eighth Amendment opened this morning at 7am.
More than three million people are eligible to vote .
The polling stations will stay open until 10pm this evening.
There are 211 polling stations in operation today in county Mayo.
Voters are being asked a Yes / No question in the ballot box.
A Yes vote means repealing the 8th amendment and allowing the Oireachtas to legislate for abortion.
A No vote will retain the 8th amendment as it is now.
Voters should mark an X next to their choice.
Your polling /voting card will tell you where your polling station is.
If you haven't got a voting card, Mayo County Registrar Fintan Murphy told Midwest News this morning that you can still vote as long as you're on the register of electors. In that case you are advised to bring ID to the centre.
No videos or photos, including selfies, can be taken in the polling station.
You also shouldn't wear any jumpers, badges or merchandise promoting either side when you go to the station to vote.