Post-communist countries have been confronted with considerable social, political and cultural challenges since 1989. These strongly affect family structures besides other things and Slovakia is not an exception. The process of the family formation may be influenced by various factors, such as current family policy without former strongly motivating benefits, new opportunities that young people face nowadays (such as studying and working abroad), spread and availability of hormonal contraceptives and by many others. The study presents an overview of typical new forms of family and partnership arrangements – unmarried cohabitations, one-parent families, singles and homosexual partnerships. Each of them is described by relevant demographic indicators and by development of their year-rates throughout the twenty-year post-revolutionary period from 1990 to 2009. Data, which are presented in charts, come from Population and Housing Census and from annual population statistics. As the demographic trends significantly vary in the regions of Slovakia, each indicator is completed by main trends in the particular locality and by highlighting the most probable reasons for a different regional development. Generally speaking, the northern regions of Slovakia seem to be more traditional with rare occurrence of above-mentioned family and partnership forms, while the central, southern and western ones appear rich in number of them. The authoress also briefly shows the potential for creating proper social policy measures and for introducing legislation to react to these changes.