Southern California Association of Governments | 9,547 followers on LinkedIn. Innovating for a Better Tomorrow | The Southern California Association of Governments (SCAG) is the nation's largest metropolitan planning organization, representing six counties, 191 cities and more than 18 million residents. SCAG undertakes a variety of planning and policy initiatives to encourage a more sustainable Southern California now and in the future. SCAG Vision Statement Southern California's Catalyst for a Brighter Future.