No wonder all i can find is whats on the 1901 and 1911 census.
Fragments survive for 1821 – 1851 for some counties, as follows:
Antrim, 1851; Belfast city (one ward only), 1851; Cavan, 1821 and 1841; Cork, 1841; Dublin city (index to heads of household only), 1851; Fermanagh, 1821, 1841 and 1851; Galway, 1813 (numerical returns for Longford barony) and 1821; King’s County (Offaly), 1821; Londonderry (Derry), 1831 – 34; Meath, 1821; Waterford, 1841.
The original census returns for 1861 and 1871 were destroyed shortly after the censuses were taken.
Those for 1881 and 1891 were pulped during the First World War, probably because of the paper shortage.
The returns for 1821, 1831, 1841 and 1851 were, apart from a few survivals, notably for a few counties for 1821 and 1831, destroyed in 1922 in the fire at the Public Record Office at the beginning of the Civil War.
http://www.census.nationalarchives.ie/help/history.html