| Unterwellenborn to Olympia Heights (Florida) | 4,937.56 mi (7,946.24 km) |
| Unterwellenborn to Omaha (Nebraska) | 4,731.61 mi (7,614.80 km) |
| Unterwellenborn to On Top of the World Designated Place (Florida) | 4,844.31 mi (7,796.16 km) |
| Unterwellenborn to Onalaska (Wisconsin) | 4,431.96 mi (7,132.55 km) |
| Unterwellenborn to Oneida (New York) | 3,905.38 mi (6,285.10 km) |
| Unterwellenborn to Oneonta (New York) | 3,910.46 mi (6,293.28 km) |
| Unterwellenborn to Ontario (California) | 5,814.01 mi (9,356.74 km) |
| Unterwellenborn to Ontario (Oregon) | 5,200.73 mi (8,369.77 km) |
| Unterwellenborn to Opa-locka (Florida) | 4,925.06 mi (7,926.11 km) |
| Unterwellenborn to Opelika (Alabama) | 4,785.92 mi (7,702.19 km) |
| Unterwellenborn to Opelousas (Louisiana) | 5,156.16 mi (8,298.04 km) |
| Unterwellenborn to Orange (California) | 5,834.26 mi (9,389.33 km) |
| Unterwellenborn to Orange (Texas) | 5,241.25 mi (8,434.97 km) |
| Unterwellenborn to Orange City (Florida) | 4,812.37 mi (7,744.77 km) |
| Unterwellenborn to Orangeburg (South Carolina) | 4,565.61 mi (7,347.64 km) |
