75 percent of people in the Shannonside region identify as Roman Catholic according to figures released from the 2022 census.
It's part of a national figure of more than three point six million people out of the country's 5.1 million population.
The figure shows 115,500 local people see themselves as practicisng Catholics with Roscommon seeing the highest level at 55,200 people.
The 2022 census results show 33,300 people in Longford and 27,000 people in Leitrim registering as catholic.
Those who stated they had no religion on the census form were the next highest, with close to 10 percent of respondents stating they practised no religion.
The percentage translates to 6,600 people in Roscommon, 4,000 in Leitrim and 3,700 people in Longford.
Over 2,000 people noted themselves as part of the Muslim faith in the census, with the figures accounting for just over one percent of the local population.
Similar figures can be seen for those who identify as part of the Russian, Greek or Coptic Orthodox Churches.
Roscommon, Leitrim and Longford are also home to 236 Jehovah's Witnesses, 138 pagans and 74 spiritualists.
Meanwhile, over 500 people marked their religion as 'other' with some respondents branding themselves as members of Pastafarianism, Satanism and the Jedi Knight religion.
