The district consists of western San Joaquin County, including the eastern half of the Sacramento–San Joaquin River Delta, and is centered on Stockton. The district is a major gateway between the rest of the Central Valley and the San Francisco Bay Area.

Cities and Communities within the district
• August
• Country Club
• French Camp
• Garden Acres
• Kennedy
• Lincoln Village
• Morada
• Mosswood
• Mountain House
• Stockton
• Taft
• Thornton
• Tracy