SCAG is the largest MPO in the United States, representing over 18.5 million people in an area covering over 38,000 square miles (98,000 km2).
Additional mandates exist at the state level [3] SCAG's policy direction is guided by the 86-member official governing board known as the Regional Council.
Members include: The Southern California Association of Governments was formed on October 28, 1965, with the purpose of conducting growth forecasts and regional planning.
In recent years, SCAG has taken a leadership role in goods movement activities and its impact on the Southern California region.
In 2008, the California State Legislature passed SB 375, which sets a framework and target dates to achieve Green House Gas reductions.