U.S. Route 21 or U.S. Highway 21 (US 21) is a north–south United States Numbered Highway, spanning 393 miles (632 km) from Hunting Island State Park,...

U.S. Route 421 (also U.S. Highway 421, US 421) is a diagonal northwest–southeast United States Numbered Highway in the states of North Carolina, Tennessee...

U.S. Route 321 (US 321) is a spur of U.S. Route 21. It runs for 516.9 miles (831.9 km) from Hardeeville, South Carolina to Lenoir City, Tennessee; with...

U.S. Route 221 (US 221) is a 734-mile-long (1,181 km) spur of U.S. Route 21. It travels from Perry, Florida, at US 19/US 98/US 27 Alternate to Lynchburg...

U.S. Route 211 (US 211) is a spur of US 11 in the U.S. state of Virginia. Known for most of its length as Lee Highway, the U.S. Highway runs 59.09 miles...

U.S. Route 521 (US 521) is a north–south United States Highway that traverses 177.3 miles (285.3 km), from Georgetown, South Carolina, to Charlotte, North...

U.S. Route 66 or U.S. Highway 66 (US 66 or Route 66) was one of the original highways in the United States Numbered Highway System. It was established...

Several special routes of U.S. Route 21 (US 21) exist. In order from south to north, they are as follows. U.S. Highway 21 Business (US 21 Bus.) is a 5.400-mile...

U.S. Route 121 (US 121) is a proposed U.S. highway designated as the Coalfields Expressway, a four-lane highway stretching from Beckley, West Virginia...

U.S. Route 150 (US 150) is a 571-mile (919 km) long northwest–southeast United States highway, signed as east–west. It runs from U.S. Route 6 outside...