ENNGO’s are of great interest for observers as a measurement of quality of civil life and subsidiarity in society. They expose the directivity and outcomes of citizens’ activities, of their interests, values, beliefs, and their existence conditions. Their development is empowered or hampered by the legal and administrative regulations. Nongovernmental organizations generate social initiatives of local groups. They are seen as a partner of local governments. They also indicate the scope of social, educational, health, and ecological problems of certain locality. Six administrative localities of comparable potentials from Poland and Lithuania (three + three) were under investigation. Relationship and cooperation between local governments and local citizen associations, the sources of financial support of NGO, projects and other activities implemented by nongovernmental organizations were comparatively analyzed. A comparative study gives deeper insight into local prosocial activities on both sides of the border. Both investigated regions across the border are under different rules of administration, have different past, though they are located in neighbourhood and interconnected by many cultural and historical congruities. The article is finalised by conclusions involving variety and similarity of Lithuanian and Polish NGO’s achievements.