| Pharr to Olympia (Washington) | 1,972.71 mi (3,174.77 km) |
| Pharr to Olympia Heights (Florida) | 1,108.66 mi (1,784.21 km) |
| Pharr to Omaha (Nebraska) | 1,050.02 mi (1,689.84 km) |
| Pharr to On Top of the World Designated Place (Florida) | 993.55 mi (1,598.96 km) |
| Pharr to Onalaska (Wisconsin) | 1,285.26 mi (2,068.42 km) |
| Pharr to Oneida (New York) | 1,723.23 mi (2,773.27 km) |
| Pharr to Oneonta (New York) | 1,723.93 mi (2,774.41 km) |
| Pharr to Ontario (California) | 1,278.72 mi (2,057.90 km) |
| Pharr to Ontario (Oregon) | 1,619.85 mi (2,606.90 km) |
| Pharr to Opa-locka (Florida) | 1,112.74 mi (1,790.78 km) |
| Pharr to Opelika (Alabama) | 891.15 mi (1,434.16 km) |
| Pharr to Opelousas (Louisiana) | 477.96 mi (769.20 km) |
| Pharr to Orange (California) | 1,284.94 mi (2,067.90 km) |
| Pharr to Orange (Texas) | 383.94 mi (617.89 km) |
| Pharr to Orange City (Florida) | 1,051.91 mi (1,692.89 km) |
