The European Commission's Atlas of Migration is an online repository compiling migration data from both UN and non-UN sources (World Bank, UNDP, UNHCR, UNDESA, etc.). This resource may be helpful to anyone needing data on demographics, types of migrants, remittances, asylum seekers & refugees, and more for virtually all recognized countries in the world. EU27 countries even have all of their data standardized by Eurostat so comparisons between countries are possible.
Atlas of Migration: https://bluehub.jrc.ec.europa.eu/migration/app/atlas.html?
Tutorial (how to access and use the Atlas): https://youtu.be/0836m3RRBB8