The spatially uneven nature of the impacts of the Irish Famine have been recognised by both historians and geographers and research that has examined the Famine at various spatial scales has shed much light on its uneven impact on the human landscape of mid-1840s Ireland. However, the regionally varied nature of the event makes it difficult to understand its impacts at the national scale. This is because of the difficulty of assessing the extent to which local processes that may have contributed to the worsening of conditions for people in different areas operated at the national scale. The emphasis on local areas that characterises much of the literature on the Irish Famine in part contributes to this difficulty. We have much detailed research for particular villages, parishes, poor law unions and counties, but little comparative or national analysis. Recent research has attempted to bridge the gap between local and national perspectives on the Famine by constructing a geographical information systems (GIS) database of local attributes at electoral division (ED) level for the entire island. Electoral divisions are administrative units first introduced to Ireland in the mid-1840s for the purposes of rate collection and were also used as the unit for census data collection. There were 3,439 such divisions in Ireland at this time.