| Sempeter pri Gorici to Olympia Heights (Florida) | 5,142.73 mi (8,276.43 km) |
| Sempeter pri Gorici to Omaha (Nebraska) | 5,021.85 mi (8,081.89 km) |
| Sempeter pri Gorici to On Top of the World Designated Place (Florida) | 5,067.04 mi (8,154.62 km) |
| Sempeter pri Gorici to Onalaska (Wisconsin) | 4,719.49 mi (7,595.28 km) |
| Sempeter pri Gorici to Oneida (New York) | 4,159.72 mi (6,694.42 km) |
| Sempeter pri Gorici to Oneonta (New York) | 4,161.21 mi (6,696.82 km) |
| Sempeter pri Gorici to Ontario (California) | 6,130.56 mi (9,866.19 km) |
| Sempeter pri Gorici to Ontario (Oregon) | 5,526.99 mi (8,894.83 km) |
| Sempeter pri Gorici to Opa-locka (Florida) | 5,130.56 mi (8,256.84 km) |
| Sempeter pri Gorici to Opelika (Alabama) | 5,028.84 mi (8,093.14 km) |
| Sempeter pri Gorici to Opelousas (Louisiana) | 5,410.78 mi (8,707.80 km) |
| Sempeter pri Gorici to Orange (California) | 6,150.89 mi (9,898.90 km) |
| Sempeter pri Gorici to Orange (Texas) | 5,499.22 mi (8,850.13 km) |
| Sempeter pri Gorici to Orange City (Florida) | 5,031.53 mi (8,097.47 km) |
| Sempeter pri Gorici to Orangeburg (South Carolina) | 4,798.99 mi (7,723.23 km) |
