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County Route J4 is a county road in central California that runs 28 miles (45 km) nominally north-south across portions of San Joaquin County, Alameda County and Contra Costa County that are growing in population and suburbanization. The highway connects the suburbs of the far outer East Bay and the Sacramento River Delta with the northern San Joaquin Valley.
The route begins 9 miles (14 km) southeast of Tracy at County Route J3, passes through Tracy and Byron, and terminates at State Route 4 between Discovery Bay and Brentwood. This highway is also known as San Joaquin County Route J4, Alameda County Route J4, and Contra Costa County Route J4, although the majority of the route and its legislative starting point are in San Joaquin County.
The portion between Tracy and Brentwood lies along the unconstructed corridor of State Route 239. SAFETEA-LU, federal legislation enacted in 2005, authorized $14 million in federal appropriations toward construction of the route.
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