Farm to Market Road 521
  Texas Farm to Market Road and Ranch to Market Road markers
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| Highway names | |
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| Interstates: | Interstate Highway X (IH-X, I-X) |
| US Highways: | U.S. Highway X (US X) |
| State: | State Highway X (SH X) |
| Loops: | Loop X |
| Spurs: | Spur X |
| Recreational: | Recreational Road X (RE X) |
| Farm or Ranch to Market Roads: |
Farm to Market Road X (FM X) Ranch-to-Market Road X (RM X) |
| Park Roads: | Park Road X (PR X) |
| System links | |
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| Location: | San Saba County |
| Length: | 22.279 mi (35.855 km) |
| Existed: | July 13, 1945–present |
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| Location: | Mason and San Saba counties |
| Length: | 35.604 mi (57.299 km) |
| Existed: | July 13, 1945–present |
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| Location: | McCulloch and San Saba counties |
| Length: | 16.013 mi (25.770 km) |
| Existed: | July 14, 1945–present |
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| Location: | Coleman and McCulloch counties |
| Length: | 48.023 mi (77.286 km) |
| Existed: | July 14, 1945–present |
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| Location: | McCulloch County |
| Length: | 14.458 mi (23.268 km) |
| Existed: | July 14, 1945–present |
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| Location: | Jeff Davis County |
| Length: | 8.827 mi (14.206 km) |
| Existed: | July 9, 1945–present |
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| Location: | Willacy and Cameron counties |
| Length: | 19.763 mi (31.805 km) |
| Existed: | July 3, 1945–present |
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| Location: | Cameron and Willacy counties |
| Length: | 14.451 mi (23.257 km) |
| Existed: | July 3, 1945–present |
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| Location: | Cameron County |
| Length: | 9.054 mi (14.571 km) |
| Existed: | July 3, 1945–present |
Farm to Market Roads in Texas are owned and maintained by the Texas Department of Transportation (TxDOT).
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Wikipedia