San Joaquin Regional Transit District, commonly known as San Joaquin RTD, or simply as RTD, is a transit district that provides bus service to the city of Stockton, California and the surrounding communities of Lodi, Ripon, Thornton, French Camp, Lathrop, Manteca, and Tracy. In 2025, the system had a ridership of 2,717,100, or about 9,900 per weekday as of the fourth quarter of 2025.