This ISR-Research Report summarises the results of a research project in which the synthesised population register of the City of Vienna was evaluated with regard to its applicability in social sciences. For this purpose, several analyses were carried out on two central topics of urban research - the arrival city and ethnic segregation - at different levels of scale. The results of this report are therefore of interest for two reasons: Firstly, from a thematic perspective, they show recent small-scale analyses of the social structure of Vienna. Secondly, from a methodological perspective, these analyses contribute to the further development of synthetic register data for spatial social research.