Children’s centers are welfare facilities established under Article 40 of the Child Welfare Law. The operating guidelines for such establishments stipulate that staff members should visit areas where these are lacking and provide opportunities for children to engage in play events through mobile children’s center activities. Previous research has shown that mobile children’s center activities can have a preventive effect by identifying needs outside of children’s centers and connecting them to support, but the actual situation has not been fully understood. This study examined the activities of mobile centers and analyzed how play-based activities have evolved to meet the needs of local children and their caregivers. It also investigated the potential of mobile children’s center activities in creating a suitable environment for the sound development of children in the community. The results of a nationwide survey of children’s centers showed that mobile children’s center activities include childcare support and the provision of physical play. Regarding meeting community needs, they provide individualized support and assistance through social resources. The development of these activities involves numerous local residents and promotes collaboration among various community organizations, including neighborhood associations, which aim to foster unity and support within the community, and children’s associations, which focus on the well-being and engagement of young people through organized events and interactions. Therefore, mobile children’s center activities provide an opportunity to raise awareness among local residents about the sound upbringing of children. In this process, residents must proactively work together to meet community needs. Mobile children’s center activities are not limited to children’s centers and have the potential to develop into proactive facilities for local residents.