FamilySearch adds Irish census remnants

Not every part of the early Irish censuses were destroyed. Now FamilySearch has made available the indexed surviving fragments, thanks to their cooperative agreement with Findmypast.

For 1821: 275,103 records survive in 10,459 images.
For 1831: there are 80,338 records in 3,818 images
For 1841: 15,850 records are available in 2,358 images
For 1851: 58,795 records are in 9,450 images.

You need to be an especially lucky to have an ancestor in one of the few surviving parishes.