The following highways are numbered 521:
Canada
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United States
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U.S. Route 521
Maryland Route 521
County Route 521 (New Jersey)
Ohio State Route 521
Puerto Rico Highway 521
South Carolina Highway 521
| Preceded by 520 |
Lists of highways 521 |
Succeeded by 522 |
This article includes a list of roads, streets, highways, or other routes that are associated with the same title.
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