The usual warning goes out to anyone who is researching surnames - please be aware of the variations possible in the spelling of a surname. For example: Graig or Craig; or, Riley, Rilley, Reilly, Reily or Reilley.
Irish census information is available beginning with the year 1813. After 1821, the census was taken every ten years for the remainder of the nineteenth century. Information for years prior to 1901 may be incomplete, as returns from many areas have not survived. The data for the years 1901 and 1911 is available in its entirety. This information is available on the microfiche listed above. O'Neill Libraries' holdings include only the statistical data. See 'websites' tab for link to online census data from the National Archives Ireland.
International Population Census Publications, Europe, Ireland. Woodbridge, Connecticut: Research Publications, 197- (O'Neill Library Microforms: MicrofilmHA1170.1 1926)
Contains:1926.--1936.--1941.--1946.--1951, 1956.--1961.--1966.--1971 (Some years not complete)
International Population Census, Europe, Northern Ireland. Woodbridge, Connecticut : Research Publications, [197-] (O'Neill Microforms Microfilm HA1141.5 1926)
Census information for Northern Ireland for various years between 1926 and 1939.