Full edition for public use. The REMINDER Integrated Multilevel Database on Migration in the EU brings together cross-national public opinion data and statistics related to immigration and EU mobility from multiple sources. The archived material offers complete replication code and auxiliary files to assist researchers in reconstructing and expanding the database for their own analyses. Please note that replication requires users to access the original survey data separately. The integrated database consists of 184400 observations and 160 variables, 61 of which are at the country level (28 EU plus Norway and Switzerland). We harmonize existing and newly collected survey data between 2002 and 2017, matched with country level data on the welfare impacts of immigration as well as stocks and flows of immigrant populations.