Irish Census
Since the recent publishing by the National Archives of the 1901 and 1911 census information, there has been a renewed interest by a lot of persons, both at home and abroad in tracing their ancestors. The general search for this information is available here.
It is also possible to browse the records by date and place. Specific information for Kilcormac in 1901 is available here and for 1911 is here.

Please note that Offaly is referred to as Kings County and Kilcormac is referred to as Frankford. Other regional names, locations and bounderies may have changed so it is often worthwhile researching all the available locations.
For general help with genealogy the National Archives website offers a list of links, services and information. While they do not perform searched or information gathering for specific request they hold one of the largest searchable archives of Irish genealogical information available.