The research project “Residential segregation in in five European countries – A comparative study using individualized scalable neighbourhoods” (ResSegr) started in August 2014 as a cooperation between researchers at Stockholm University (Department of Human Geography), the University of Oslo (Department of Sociology and Human Geography), Statistics Denmark, the Netherlands Interdisciplinary Demographic Institute and the Vrije Universiteit Brussels (Interface Demography). Funding was granted by the Joint Programme Initiative Urban Europe.This is the technical report documenting the processes that have led to the making of the harmonized multi-country datasets with segregation indicators that was one of the main outputs of the project. In the report, we provide a description of the national datasets and the geographical coordinates, the definition of indicators and a description of the software used to produce the data. Similarities as well as differences between the different national datasets and indicators are highlighted. One chapter pays attention to the various ethical and privacy considerations that were considered in the creation of the dataset so that privacy of individuals could be protected. More information about the project can be found at www.residentialsegregation.org. ; Residential Segregation in Five European Projects: A comparative study using individualized scalable neighbourhoods