South Carolina Highway 19

South Carolina Highway 19 Truck (SC 19 Truck) is a 9.880-mile (15.900 km) truck route that provides routing west around downtown Aiken, via SC 118, for trucks; which are not allowed in the downtown area.[12]

South Carolina Highway 19 Connector (SC 19 Conn.) is a short 0.130 miles (0.209 km) hidden connector route, which is signed as northbound SC 19, between Park Avenue and Richland Avenue. Northbound SC 19 continue northbound along Richland Avenue to reconnect southbound SC 19 at Laurens Avenue.[14]

South Carolina Highway 19 Alternate (SC 19 Alt.) was an alternate route that partially existed within the city limits of Trenton. In 1939, its southern terminus was established at U.S. Route 25 (US 25) south-southwest of the town. It then traveled northeast across the mainline's path, on Greenhouse Road and S.E. Diggs Road. At the intersection with East Wise Street, it turned left and traveled to the northwest. Just before an intersection with the southern terminus of Thurmond Street, it began a curve to the west-northwest. At Watson Street, it turned to the right and traveled to the north-northwest. At Church Street, it turned left and resumed its west-northwest direction. It continued on Church Street until it ended at another intersection with SC 19, which existed north of the town at the time. In 1947, the southern terminus was truncated to end at its southern intersection with the mainline, removing it from Greenhouse Road. In the mid-1950s, the portion on Watson and Church streets was removed, with the alternate route using the entire length of Wise Street. Between 1965 and 1967, it was decommissioned and redesignated as SC 19 Conn. and SC 121 Conn.

The entire route was in Edgefield County.

Location	mi	km	Destinations	Notes
​			US 25	Southern terminus; now also part of SC 121
​			SC 19
Trenton			SC 19	Northern terminus; now SC 121
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

South Carolina Highway 19 Connector (SC 19 Conn.) is a 2.040-mile (3.283 km) unsigned connector route through Trenton, via Samuel E. Diggs Road and Wise Street. Sharing a concurrency with SC 121 Conn, it has appeared on official state maps since the 1930s (possibly earlier). The routing provides a primary routing through the center of Trenton.[16]