Scholars of Ireland and Irish religion too often neglect geography and geographical change. This book employs new spatial technologies to argue that the history of Irish religion through the nineteenth and twentieth centuries cannot be understood outside of its spatial context. This critical period in Irish history encompasses the Famine, Partition, and the Troubles as well as longer-term trends such as urbanisation and industrialisation. All of these issues have had impacts that have varied geographically and temporally, but the rich data that are available on them have yet t be properly exploited, in part because of technological limitations which have now been overcome.