High Quality Content by WIKIPEDIA articles! Interstate 680 (I-680) is a north south Interstate Highway in Northern California. It curves around the eastern cities of the San Francisco Bay Area from San Jose to Interstate 80 at Cordelia, bypassing cities along the eastern shore of San Francisco Bay such as Oakland and Richmond while serving others more inland such as Pleasanton and Concord. I-680 is part of the State Scenic Highway System from SR 238 in Fremont north to SR 24 in Walnut Creek, and is eligible for said system from SR 238 south to the Alameda-Santa Clara County line.