This research aims to draw on the concept of “entitativity”, as used in social psychology, to understand the way the people organize information about places and the people that live in those places. The term “entitativity”, introduced by Campbell (1958), refers to the degree to which a social aggregate is perceived as “having the nature of an entity, of having real existence” (p.17). Social group can vary along a continuum that ranges from low to high entitativity. Hamilton and Sherman (1996) reintroduced the concept and found empirical data that confirmed the hypothesis that perceptions of entitativity, i.e. seeing social targets as possessing unity and coherence, have important implications for how one organizes information about groups and forms impressions. The aims of this research are to identify if a social aggregate based on the belonging to a specific place (neighbourhood) varies in terms of entitativity and the social and physical characteristics of this group related to space that are more strongly associated with the perception of entitativity. Finally, this study intends to find if it is possible to identify different dimensions in the perception of neighbourhoods.189 university students rated a sample of 20 neighbourhoods from the city of Lisbon, Portugal, on 23 social and physical properties of groups (e.g.: group member similarity, size, attractiveness, degree of organization) and perceived entitativity. The results show that the 20 neighbourhoods vary significantly in terms of the perception of entitativity. On a scale of 9 points the entitativity perception varies between a mean of 7,36 (high entitativity) and 3, 41 (low entitativity). Correlational analyses were used to determine the group properties more strongly related to entitativity. The social attributes considered were highly correlated with entitativity, in accordance with Lickel et al. (2000) findings. A set of physical attributes of place was negative and strongly connected with entitativity, “rich”, “planned”, “big”, “modern”, “functional” and “organized”. Factor analysis identified 3 factors in the perceptions of neighbourhoods called “attractivity“, “functionality, modernity and big dimension” and “entitativity”. Clustering analysis identified 5 general types of neighbourhoods that are correlated with the neighbourhood features considered. Finally, the implications of entitativity concept to the understanding of intergroup relationships in urban areas were also discus