Interstate 205 (abbreviated '''I-205''') in California is a short connecting Interstate Highway between Interstate 5 and Interstate 580 south of the town of Lathrop . There are two principal urban areas along the small stretch of interstate, Tracy and the new town of Mountain House .
Most of the stretch of Interstate 205 parallels the Historic U.S. Highway 50 , which is now designated as Business Loop 205. Business Loop 205 is only a couple miles shorter than its parent route, with its eastern terminus at Interstate 5. Although it is well-signed along the route, signs along 205 refer to its actual name; Eleventh Street.