South Carolina Route Log

Researched by Paul Martin, the South Carolina Route Log lists all Interstate, U.S., and State Highways in South Carolina.


Five major interstates serve the state. Interstate 20 joins the capital city with Florence and Interstate 95 to the east and Augusta and Atlanta, Georgia to the west. Interstate 26 joins Charleston and the LowCountry with Columbia and the Greenville/Spartanburg area. Interstate 77 provides a link from Columbia northward to Rock Hill and Charlotte, North Carolina. Interstate 85 straddles the Appalachian Mountain Piedmont as a busy freeway linking Atlanta with Charlotte. Interstate 95 travels north-south along the coastal plain, primarily providing through traffic needs between Florida and the Northeast U.S.

Interstate 73 is a planned route from southern North Carolina near Rockingham eastward into the Myrtle Beach and Grand Strand area. Funding delays, environmental concerns due to wetland impacts, and public support have hampered efforts for new corridor. As such, some portions may be built as a toll road to accelerate construction.

Six branch routes serve cities across the Palmetto State. These include Interstate 185, a combination urban spur to Downtown Greenville and tolled loop south of Greenville. Joining I-185 at Greenville is Interstate 385. The lengthy route originates east of Downtown along the Golden Strip Freeway. The freeway circles east and south to Mauldin, where it overtakes U.S. 276 southeast to Simpsonville, Fountain Inn and Clinton where it connects with I-26. Interstate 585 rounds out the Upstate spurs, connecting Business Loop I-85 with Spartanburg alongside U.S. 176 on an older freeway.

Further south, Interstate 126 spurs east from I-26 to Downtown Columbia. The 2009 completed extension of I-520 east to I-20 at North Augusta completed the loop south around Augusta, Georgia. The lone branch route in the LowCountry is Interstate 526. The east-west freeway forms a bypass for U.S. 17 and commuter route from I-26 west and east of Charleston. Efforts continue to complete the loop south and east to the James Island Freeway (South Carolina 30).

U.S. Highways

Much of the original network of U.S. routes within the Palmetto state remains in intact. Some exceptions are the truncation of U.S. 276 due to Interstate 385 and the removal of U.S. 29 Alternate near the Spartanburg vicinity due to Interstate 85. Additional realignments include U.S. 17 with I-95 south from Yemassee, U.S. 15 & 301 with I-95 across Lake Marion, and U.S. 76 along the I-126 spur into Columbia.

SCDOT also assigns U.S. and State Highway spurs. These routes are generally unsigned, and provide connectivity between intersecting or adjacent routes. U.S. 52 Spur extends south to the Charleston historic district as an example.

U.S. 15's Southern Terminus

U.S. 17A northbound at U.S. 15 and South Carolina 64 Business in Walterboro. U.S. 15 begins a six-state run from here. Photo taken by Paul Martin (2001).

State Highways

South Carolina state highways are not organized in a north-south or east-west scheme. Route clustering is also not used in the state. Three-digit state highways however act as loops and spurs from their implied parent routes. South Carolina 171 for instance refers to U.S. 17 in its numbering, or can be read as South Carolina 17-1. South Carolina 165 technically reads South Carolina 16-5, as it branches from South Carolina 5. This configuration is not unique to South Carolina, as Washington state also follows the practice.

Several multi state routes join the South Carolina state highway system, including MSR 72 with Georgia, MSR 28 with Georgia and North Carolina, and MSR 121 south to Florida. Freeway construction at Myrtle Beach designated South Carolina 22 as part of the future Interstate 73 corridor and South Carolina 31 along the Carolina Bays Parkway. Carolina Bays Parkway is the potential "eastern" extent for Interstate 74 from coastal North Carolina. S.C. 31 previously was numbered along the Mark Clark Expressway (now I-526) west of Charleston.

U.S. 17A south and U.S. 52 west split - Moncks Corner.

S.C. 6 trailblazer at the split of U.S. 17A south and U.S. 52 east at Moncks Corner. South Carolina redesigned the state highway marker in 2007. Debuting then was a design featuring the palmetto tree and crescent moon, symbols from the South Carolina state flag. New signs were grandfathered in throughout the state, initially with the replacement of damaged or missing signs.

Current SC Passenger Vehicle Plate

The state slogan Smiling Faces. Beautiful Places was incorporated into the new South Carolina license plate in 2000. The Palmetto State redesigned the plate twice since then.

An alternate standard tag design available features the state flag and caption In God We Trust. Vanity tags issued in the state feature an alternate background featuring a mountain and seagrass motif, indicative of the state's diverse geography.

Page Updated December 15, 2007.

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