This study explores factors that influence Swedish civil society organizations’ (CSOs) degree of activity at different geographical and administrative levels and, in particular, how they are affected by processes of Europeanization in the social welfare policy area. The present study is based on a national survey and includes approximately 1,600 Swedish CSOs. Despite the often claimed mismatch between the Swedish welfare model and European Union (EU) level social policy measures, EU membership has opened a new level of opportunities for activities for Swedish CSOs. The results show that Swedish CSOs are mostly active at the local level and very seldom at the European level. The strongest factor contributing to Swedish CSOs’ degree of activity at the European level is the perceived relevance of this level. Furthermore, resources have a great impact. CSOs that can claim strong representativeness and that have access to employed staff are more likely to be Europeanized.