What is the largest gang in San Diego?

The largest gang in San Diego is the Sureños, a subset of the Mexican Mafia, which is the oldest and most powerful prison gang in the United States. The Sureños are active in neighborhoods throughout the city, including Barrio Logan, National City, and Chula Vista. They are estimated to have around 10,000 members in San Diego County, making them the dominant criminal organization in the region.