JSI worked with the Government of the DRC in Kinshasa to implement new short- and long-term strategies to reduce missed opportunities for vaccination and reach zero-dose children through the existing routine immunization system by adapting the Reaching Every District (RED) approach to the urban context. This brief describes JSI's approach to developing an action plan and piloting and assessing interventions, such as marketplace vaccination and using GIS to map health facilities to inform micro-planning. The brief also provides lessons learned and considerations for scale up of these interventions based on the project's experience.