U.S. Route 521 | |||||||||
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 US 521 highlighted in red | |||||||||
| Route information | |||||||||
| Auxiliary route of US 21 | |||||||||
| Length | 177.3 mi[1] (285.3 km) | ||||||||
| Existed | 1932–present | ||||||||
| Major junctions | |||||||||
| South end |  US 17 in Georgetown, SC | ||||||||
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| North end |  I-485 in Charlotte, NC | ||||||||
| Location | |||||||||
| Country | United States | ||||||||
| States | South Carolina, North Carolina | ||||||||
| Counties | SC: Georgetown, Williamsburg, Clarendon, Sumter, Kershaw, Lancaster NC: Mecklenburg | ||||||||
| Highway system | |||||||||
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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 Carolina. Though numbered as an auxiliary route of US 21, it does not actually intersect its parent or any of its sibling routes, though it is in the same general part of the country as other routes from its family. Historically, it once connected to US 21 in Pineville, North Carolina, but various changes have left it terminating a few miles short of the current US 21.
- ^ Google (January 31, 2011). "Overview Map of US 521" (Map). Google Maps. Google. Retrieved January 31, 2011.