Census 2011 was the first time where each household and dwelling was linked to spatial coordinates, thereby offering greater flexibility in relation to the production of geographical outputs. The result of this linkage means that grid cells of equal size can be used to disseminate data from the 2011 census. The advantages of grids are that they offer independence from existing administrative boundaries (which can facilitate cross-border analysis) and provide a better representation of the spatial distribution of the population.The 1 Km² grid dataset is available in the Irish Transverse Mercator (EPSG Code 2157) as a comma delimited values file (.csv) and in vector format (.shp). It is also available in the ETRS89 Lambert Azimuthal Equal-Area (EPSG Code 3035) projection on request.