 When first signed, US 17 followed a route that went through Florence and Marion.The original route through South Carolina was long.At this time, U.S. routes in South Carolina used a dual-numbering system; US 17 was also signed SC 1 from Georgia to Yemasse, SC 30 from Yemassee to Walterboro, SC 6 from Walterboro to Charleston, SC 2 from Charleston to Goose Creek, SC 41 from Goose Creek to Florence, SC 3 from Florence to North Carolina.