| Slovenj Gradec to Oswego (Illinois) | 4,746.93 mi (7,639.45 km) |
| Slovenj Gradec to Oswego (New York) | 4,213.04 mi (6,780.23 km) |
| Slovenj Gradec to Otsego (Minnesota) | 4,760.19 mi (7,660.79 km) |
| Slovenj Gradec to Ottawa (Illinois) | 4,780.86 mi (7,694.05 km) |
| Slovenj Gradec to Ottawa (Kansas) | 5,154.06 mi (8,294.66 km) |
| Slovenj Gradec to Ottumwa (Iowa) | 4,928.82 mi (7,932.17 km) |
| Slovenj Gradec to Overland (Missouri) | 4,968.56 mi (7,996.13 km) |
| Slovenj Gradec to Overland Park (Kansas) | 5,118.48 mi (8,237.40 km) |
| Slovenj Gradec to Overlea (Maryland) | 4,391.34 mi (7,067.18 km) |
| Slovenj Gradec to Oviedo (Florida) | 5,086.63 mi (8,186.15 km) |
| Slovenj Gradec to Owasso (Oklahoma) | 5,294.05 mi (8,519.95 km) |
| Slovenj Gradec to Owatonna (Minnesota) | 4,804.97 mi (7,732.86 km) |
| Slovenj Gradec to Owensboro (Kentucky) | 4,890.08 mi (7,869.83 km) |
| Slovenj Gradec to Owings Mills (Maryland) | 4,400.47 mi (7,081.88 km) |
| Slovenj Gradec to Owosso (Michigan) | 4,529.58 mi (7,289.66 km) |
