| Nova Gorica to Olympia Heights (Florida) | 5,142.30 mi (8,275.73 km) |
| Nova Gorica to Omaha (Nebraska) | 5,020.78 mi (8,080.16 km) |
| Nova Gorica to On Top of the World Designated Place (Florida) | 5,066.49 mi (8,153.72 km) |
| Nova Gorica to Onalaska (Wisconsin) | 4,718.43 mi (7,593.58 km) |
| Nova Gorica to Oneida (New York) | 4,158.92 mi (6,693.13 km) |
| Nova Gorica to Oneonta (New York) | 4,160.44 mi (6,695.58 km) |
| Nova Gorica to Ontario (California) | 6,129.25 mi (9,864.07 km) |
| Nova Gorica to Ontario (Oregon) | 5,525.56 mi (8,892.53 km) |
| Nova Gorica to Opa-locka (Florida) | 5,130.13 mi (8,256.14 km) |
| Nova Gorica to Opelika (Alabama) | 5,028.14 mi (8,092.01 km) |
| Nova Gorica to Opelousas (Louisiana) | 5,409.99 mi (8,706.54 km) |
| Nova Gorica to Orange (California) | 6,149.57 mi (9,896.78 km) |
| Nova Gorica to Orange (Texas) | 5,498.41 mi (8,848.83 km) |
| Nova Gorica to Orange City (Florida) | 5,031.00 mi (8,096.61 km) |
| Nova Gorica to Orangeburg (South Carolina) | 4,798.36 mi (7,722.21 km) |
