This article delves into the application of Citizen Science and Geo-volunteering in mapping Roma settlements in Eastern Slovakia, highlighting the transformative power of collaborative mapping for social good. By focusing on local community engagement, the case study employs open-source GIS tools such as QGIS and OpenStreetMap to actively involve community members and volunteers in the Geodesign process. A key aspect of this approach was the collaboration between local stakeholders – including mayors, municipal representatives and community members - who actively participated in defining the data model, selecting attributes for housing assessments, and interpreting results for policy planning. By incorporating geodesign, the study not only improved data accuracy but also strengthened local governance and public awareness of housing conditions in marginalized communities. Local residents become integral participants in the decision-making process, enhancing their understanding of local issues and contributing to more inclusive development outcomes. Central to this effort is geo-volunteering, which bridges the gap between data collection and local needs, ensuring the mapping process is inclusive and reflective of the community's perspectives. The study aims to demonstrate how Geo-volunteering can play a critical role in shaping social and economic policies, particularly in marginalized communities, by empowering residents and fostering sustainable development.