Religious Composition of Ireland 1834-2011 :
NOTE: The statistics for 1834 and 1861 refer to the whole of Ireland; those from 1881 onwards have been adjusted to exclude Northern Ireland by CSO. The 1834 figures list 'Methodist' under 'Anglican (Church of Ireland)'
From 1881 to 2011:
- The Roman Catholic population increased from 3,465,332 to 3,861,335; but as a percentage of the population, it decreased from 89.54% to 84.16%. It peaked in 1961 at 94.86% of the population. The Catholic population is continuing to increase, but not at the same rate as the overall Irish population.
- The Church of Ireland population decreased from 317,576 (8.21%) to 129,039 (2.81%). Its lowest value was 89,187 (2.53%) in 1991.
From 1961 to 2011, the category of 'No Religion' increased from 1,107 (0.04%) to 269,811 (5.88%). It now represents the largest group in Ireland by percentage and absolute values outside of the Roman Catholic Church.
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The 'Other Religions' figure for 2011 is broken down as follows: Other Christian Religions: 41,161; Other Religions: 86,139.
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