Many countries in Central and Eastern Europe (CEE) grant preferential access to citizenship to co-ethnics living outside their borders. This overlaps with several key regional demographic trends, such as a dramatic decrease of fertility rates, high emigration and changes in the ethnic structure of the populations. The paper analyses co-ethnic citizenship policies of five CEE countries in order to assess their demographic impact on both the kin-states and on the communities of co-ethnics living outside their kin-state. It argues that, despite their important potential, co-ethnic citizenship policies in the region have yielded little ethno-demographic benefits. The size of both core ethnic groups in the kin-state and of co-ethnic communities living outside the kin-state has decreased throughout the region. Moreover, on several occasions, the situation of co-ethnics has worsened as a direct consequence of co-ethnic citizenship policies.