| Slovenj Gradec to Oakley (California) | 6,014.97 mi (9,680.15 km) |
| Slovenj Gradec to Oakton (Virginia) | 4,444.65 mi (7,152.98 km) |
| Slovenj Gradec to Oakville (Missouri) | 4,979.03 mi (8,012.97 km) |
| Slovenj Gradec to Oatfield (Oregon) | 5,584.33 mi (8,987.11 km) |
| Slovenj Gradec to Ocala (Florida) | 5,102.91 mi (8,212.33 km) |
| Slovenj Gradec to Ocean Acres (New Jersey) | 4,282.53 mi (6,892.07 km) |
| Slovenj Gradec to Ocean City (New Jersey) | 4,316.49 mi (6,946.71 km) |
| Slovenj Gradec to Ocean Pines (Maryland) | 4,377.94 mi (7,045.61 km) |
| Slovenj Gradec to Ocean Pointe (Hawaii) | 7,730.83 mi (12,441.57 km) |
| Slovenj Gradec to Ocean Springs (Mississippi) | 5,320.11 mi (8,561.89 km) |
| Slovenj Gradec to Oceanside (California) | 6,181.23 mi (9,947.72 km) |
| Slovenj Gradec to Oceanside (New York) | 4,217.67 mi (6,787.69 km) |
| Slovenj Gradec to Ocoee (Florida) | 5,105.38 mi (8,216.32 km) |
| Slovenj Gradec to Oconomowoc (Wisconsin) | 4,684.87 mi (7,539.58 km) |
| Slovenj Gradec to Odenton (Maryland) | 4,411.79 mi (7,100.09 km) |
