Due to insufficient historical population data, there is limited knowledge about the demographic outcomes of colonisation. This study provides demographic evidence of the difficulties faced by the Sami – an indigenous population in Sweden – during nineteenth-century colonisation, as indicated by (1) high risks of migration and (2) low survival rates compared to non-Sami. The digitised parish registers of the Demographic Data Base (Umeå University) provide longitudinal, individual-level data on migration, mortality, and ethnic origin. Event history analysis reveals that the Sami were vulnerable, with a higher mortality rate than non-Sami, and that they were more prone to migrate from areas overcrowded due to an increased competition for land. However, regardless of ethnic origin, it was primarily the settlers who migrated, and who ran the lowest mortality risks. This result suggests a ‘healthy settler effect’, and diverse consequences of colonisation that did not always follow ethnic lines.