County Route J1 is a county road in San Benito and Fresno counties. The route begins in Paicines, San Benito County, at State Route 25. Between Paicines and Panoche Valley, J1 is known as Panoche Road. Its north–south portion between Panoche Valley and Fresno County is called Little Panoche Road. In Fresno County, the route then intersects with Interstate 5 and terminates in Mendota at State Route 33 near State Route 180 in the Central Valley. East of Interstate 5, the alignment of J1 follows Fresno County's West Shields Avenue (which is Exit 379 off of Interstate 5). Shields Avenue ends at North Fairfax Avenue. J1 continues south 2 miles (3.2 km) on Fairfax Avenue to West Belmont Avenue, at which location J1 proceeds east on Belmont Avenue until its end at State Routes 33 and 180.
Panoche Road lies within the corridor of an unbuilt Route 180 segment. No current plan exists to extend Route 180 westward from Mendota past Interstate 5 and into San Benito County.
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.
The route begins 2 miles (3.2 km) east of Vernalis as Kasson Road, running northward from the road's intersection with State Route 132. After almost 3 miles (4.8 km) the route meets Airport Way and follows it northward 21 miles (34 km) past Manteca, Lathrop, and French Camp into Stockton. J3 then follows West Lane 10 miles (16 km) out from Stockton and becomes Hutchins Street for the route's last 1 mile (1.6 km). The route reaches its northern end at State Route 12 near Lodi.
The highway is also known as Stanislaus County Route J4 and San Joaquin County Route J4, though all but 1 mile (1.6 km) of the route is within San Joaquin County.
County Road J5 is a county road in San Joaquin County, California that runs for about 30 miles (49 km). It begins at Highway 99's interchange with Jack Tone Road in Ripon. Following Jack Tone Road, County Road J5 passes through State Route 120 east of Manteca and California State Routes 4 and 26 east of Stockton. Eventually, it makes a slight right at Hammond Street in Lockeford and then a left turn at Tully Road. Tully Road becomes Elliot Road, which eventually leads to Peltier Road, where County Road J5 ends.
County Route J8 starts at the intersection of Hammer Lane and State Route 99 in Stockton. The route proceeds west to the intersection of Thornton Road, then turns northwest, following Thornton Road and N Thornton Road from Stockton to the Sacramento County line north of Thornton. North of Thornton, the route proceeds slightly away from I-5 until it parallels the Union Pacific Railroad and crosses the Cosumnes River into Sacramento County. From here the route is known as Franklin Boulevard and proceeds north to the town of Franklin. Northbound traffic must then turn east onto Bilby Road to cross the railroad; then turn north to rejoin Franklin Boulevard south of its junction with Elk Grove Boulevard. Southbound traffic follows the original alignment of Franklin Boulevard to cross the railroad tracks. The route continues north through Elk Grove and parts of the city of Sacramento before its junction with State Route 99 at Broadway in Sacramento.
County Route J9 is the main route between the cities of Oakdale, Waterford, and Turlock. It is especially busy during the morning and evening rush hours. This route is primarily rural, only traveling through a few cities, all with fewer than 20000 people.
This road begins at Interstate 5 near Stockton. It then continues east through French Camp and south Stockton to SR 99. From here, the route is primarily rural. It then travels through Valley Home southbound. Next it crosses the Stanislaus River into Oakdale, passes the old Hershey's plant, and continues over the Hetch Hetchy Aqueduct. It then turns sharply left and becomes the Oakdale-Waterford Highway, through Waterford. Exiting Waterford, it crosses the Tuolumne River into Hickman and stays rural through to its terminus at J17.
CR J11 begins at the junction of CR E13 at the eastern end of the Walnut Grove Bridge in the town of Walnut Grove. The route proceeds south briefly along the levee of the Sacramento River and Georgiana Slough before leaving the levee and turning east. The route crosses into San Joaquin County at the Mokelumne River and proceeds eastward to cross Interstate 5 before it terminates at the junction of County Route J8 in the town of Thornton.
County Route J15 is an unsigned route, starting at Ave 96 and ending at Ave 232, staying within Tulare County. It follows Rd 152 for the entire length (17 miles or 27 kilometers) and intersects California State Highway 190 at mile 6.
The route is known as Sperry Avenue from Interstate 5 to Patterson, Las Palmas Avenue from Patterson to the San Joaquin River, West Main Street from the San Joaquin River to Turlock, East Avenue from Turlock to Oakdale Road, Oakdale Road from East Avenue to Turlock Road and Turlock Road from Oakdale Road to State Route 59.
County Route J21 (Dry Creek Drive) connects State Route 245 (Millwood Drive) near Badger with State Route 216 outside of Woodlake in Tulare County. Defined in 1968, it runs 18.21 miles (29.31 km) from an elevation of approximately 3,000 feet (914 m) near Badger to approximately 400 feet (122 m) near Woodlake.