| Unicov to Olympia Heights (Florida) | 5,194.25 mi (8,359.34 km) |
| Unicov to Omaha (Nebraska) | 4,960.35 mi (7,982.92 km) |
| Unicov to On Top of the World Designated Place (Florida) | 5,098.52 mi (8,205.28 km) |
| Unicov to Onalaska (Wisconsin) | 4,662.85 mi (7,504.13 km) |
| Unicov to Oneida (New York) | 4,152.35 mi (6,682.56 km) |
| Unicov to Oneonta (New York) | 4,158.58 mi (6,692.59 km) |
| Unicov to Ontario (California) | 6,017.48 mi (9,684.20 km) |
| Unicov to Ontario (Oregon) | 5,391.17 mi (8,676.25 km) |
| Unicov to Opa-locka (Florida) | 5,181.71 mi (8,339.16 km) |
| Unicov to Opelika (Alabama) | 5,035.61 mi (8,104.03 km) |
| Unicov to Opelousas (Louisiana) | 5,401.91 mi (8,693.53 km) |
| Unicov to Orange (California) | 6,037.60 mi (9,716.59 km) |
| Unicov to Orange (Texas) | 5,485.70 mi (8,828.39 km) |
| Unicov to Orange City (Florida) | 5,067.21 mi (8,154.89 km) |
| Unicov to Orangeburg (South Carolina) | 4,817.84 mi (7,753.57 km) |
