Cities in many Central and Eastern European (CEE) countries have transformed rapidly since the political and socioeconomic restructuring started in the early 1990s. Economic reforms, growing income inequalities, changes in housing system and selective residential mobility are resulting in increasing socio-spatial diff erentiation among urban neighbourhoods also in Riga. In addition, litt le is known about the ethnic dimension of intra-urban residential diff erentiation, despite the existence of sizeable minority populations. The focus on ethnicity is important, since Riga is the only capital city in the Baltic States where the ethnic majority is outnumbered by the non-Latvian minority. This paper provides empirical evidence about socio-spatial diff erentiation in Riga according to its ecological structure. Our aim is to examine the characteristics of the inhabitants by distinctive types of urban neighbourhoods with particular interest on ethnicity. The analysis is based on a recent sample survey that was carried out in 2012 and 2013. The results reveal that characteristics of population subgroups diff er among urban zones with regard to ethnic origin, age, household size and income. Less pronounced are diff erences by education, migration background and family type. The conclusion is that Riga is a relatively mixed city at the beginning of the 21 st century.