The following highways are numbered 521:
Canada
Cuba
United States
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 |
| 0–9 | |
|---|---|
| 10–16 | |
| 17–22 | |
| 23–31 | |
| 32–44 | |
| 45–63 | |
| 64–85 | |
| 86–103 | |
| 104–125 | |
| 126–149 | |
| 150–174 | |
| 175–199 | |
| 200–224 | |
| 225–249 | |
| 250–274 | |
| 275–299 | |
| 300–324 | |
| 325–349 | |
| 350–374 | |
| 375–399 | |
| 400–424 | |
| 425–449 | |
| 450–474 | |
| 475–499 | |
| 500–524 | |
| 525–549 | |
| 550–574 | |
| 575–599 | |
| 600–624 | |
| 625–649 | |
| 650–674 | |
| 675–699 | |
| 700–724 | |
| 725–749 | |
| 750–774 | |
| 775–799 | |
| 800–824 | |
| 825–849 | |
| 850–874 | |
| 875–899 | |
| 900–924 | |
| 925–949 | |
| 950–974 | |
| 975–999 | |
| 1000+ | |
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