County Route J2 (California)

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County Route J2 is a series of streets and roads in the California counties of Alameda and San Joaquin.

J2 begins at Interstate 580's interchange with Portola Avenue in Livermore. The route follows Portola to Livermore Avenue, where J2 turns southward to pass through Livermore's downtown. The highway continues past the southeast edge of Livermore to become Tesla Road and rise into the the Diablo Range, which separates the outer San Francisco Bay Area from the San Joaquin Valley.

At the Alameda-San Joaquin county line, J2 becomes Corral Hollow Road and enters the narrow valley of the same name. Upon approaching the San Joaquin Valley, the road turns northward, meeting Interstate 580 again and arriving at the southern subdivisions of Tracy. After passing through this city, the road intersects Interstate 205, shifts briefly onto Lammers Road, and soon turns northward onto Tracy Boulevard. Here J2 crosses the sea-level Union and Roberts Islands in the San Joaquin-Sacramento River Delta before terminating at State Route 4.