Puerto Rico Highway 21
| Ruta 21 | ||||
| Route information | ||||
| Maintained by Puerto Rico DTPW | ||||
| Length | 5.0 km (3.1 mi) | |||
| Major junctions | ||||
| West end | PR-19 in Gobernador Piñero | |||
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| East end | PR-1 / PR-176 in El Cinco | |||
| Location | ||||
| Country | United States | |||
| Territory | Puerto Rico | |||
| Municipalities | San Juan | |||
| Highway system | ||||
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Puerto Rico Highway 21 (PR-21) is the main highway to get to the Medical Center and Veterans Hospital in San Juan, Puerto Rico. Its western terminus is located at PR-19 intersection near Guaynabo and leads to San Juan before ending at PR-1 junction near Río Piedras.