Population-level descriptions of long-term childhood cancer survivors are fundamental to survivorship care and research but seldom available. A recent study has examined prevalence of long-term childhood cancer survivors (CCS) born in Sweden and shown that on December 31st, 2023, there were 8645 long-term childhood cancer survivors, equivalent to nearly 1 in 1,000 inhabitants (921 persons per million). From 1990 to 2023, the long-term survivor population in Sweden tripled in size. Projected mean annual growth was between 1.6 and 2.2%, with the population increasing to approximately 11,400-12,600 individuals by 2040. However, these estimates were based on individuals born in Sweden. There is now a non-negligible proportion of the Swedish population with a migrant background. Indeed, the number of foreign-born people living in Sweden has grown substantially since 2000, amounting to roughly 20% of the Swedish population in 2023. The migrant population could therefore include a substantial number of relatively hard-to-reach CCS whose childhood cancer was diagnosed before they had migrated to Sweden. To our knowledge, the migration patterns of childhood cancer survivors have not been studied. Given that this group of long-term CCS may also benefit from survivorship care, research in this area is needed.