I’ve been meaning to share this here for ages and I’m finally remembering to! Maybe you already know about it? But it was quite the find for me: Census of Ireland 1901/1911 and Census fragments and substitutes, 1821-51. It has:
“All thirty-two counties for 1901 and 1911, searchable by all information categories, are now available on this site. Corrections and improvements will be ongoing, and we are very grateful to all users who have submitted corrections to us. A small amount of material is missing from the site, and will be placed online as soon as possible” (emphasis as in original).
I found my grandfather’s family, which was awesome, and one of the other fun things was seeing other Irish names by way of seeing the names of the people who lived near his address. Happy searching!