The work presents and analyses research results that started on the assumption that in Benkovac, as a consequence of war destruction and emigration during the Homeland War, in the post-war period came to formation of the three ethnic categories: domicile Croatian returnees, Bosnian Croatian immigrants and domicile Serb returnees. This assumption relies upon the study conducted in Petrinja during 2003. The aim of the present research was to find out and describe how the members of each ethnic category identify themselves and how they perceive members of the other ethnic category. Intention was also to define characteristics of the relations between the members of defined ethnic categories as well as to determine on the basis of which factors each ethnic group defines its boundary towards the Other. The study was conducted through the semi-structured interviews with twelve interlocutors, six men and six women. On the account of the obtained results, the conclusion is that the main role in setting borderlines towards the Other is not necessarily affiliation to a particular ethnic category, but that the sociocultural factors and the economic and political situations play an important role as much.