Live Chat I-20 Community Nearby Traffic US 21 SC 2024-04-19 Roadnow Weather | Gas | Restaurants | Hotels | Car Repair | Convenience Stores Cities close to US 21 SC Cayce, SC 4.72 West Columbia, SC 5.09 State Park, SC 6.00 Interstate highway exits close to US 21 SC Exit 5, i77 6.74 Exit 111b a, i26 6.90 Exit 110, i26 6.95 Interstate highways close to US 21 SC i20 map 6.55 i77 map 6.74 i26 map 6.90 State roads close to US 21 SC SC 48 map 0.13 US 1 SC map 0.26 SC 12 map 0.72