| Oro Valley to Olympia (Washington) | 1,189.26 mi (1,913.92 km) |
| Oro Valley to Olympia Heights (Florida) | 1,900.00 mi (3,057.75 km) |
| Oro Valley to Omaha (Nebraska) | 1,024.29 mi (1,648.43 km) |
| Oro Valley to On Top of the World Designated Place (Florida) | 1,713.50 mi (2,757.62 km) |
| Oro Valley to Onalaska (Wisconsin) | 1,328.92 mi (2,138.69 km) |
| Oro Valley to Oneida (New York) | 2,046.74 mi (3,293.92 km) |
| Oro Valley to Oneonta (New York) | 2,070.37 mi (3,331.94 km) |
| Oro Valley to Ontario (California) | 399.06 mi (642.22 km) |
| Oro Valley to Ontario (Oregon) | 864.81 mi (1,391.79 km) |
| Oro Valley to Opa-locka (Florida) | 1,900.48 mi (3,058.52 km) |
| Oro Valley to Opelika (Alabama) | 1,487.54 mi (2,393.97 km) |
| Oro Valley to Opelousas (Louisiana) | 1,119.66 mi (1,801.91 km) |
| Oro Valley to Orange (California) | 407.42 mi (655.67 km) |
| Oro Valley to Orange (Texas) | 1,027.85 mi (1,654.17 km) |
| Oro Valley to Orange City (Florida) | 1,774.83 mi (2,856.31 km) |
