| Slovenj Gradec to Odessa (Texas) | 5,766.14 mi (9,279.70 km) |
| Slovenj Gradec to Ogden (Utah) | 5,557.05 mi (8,943.20 km) |
| Slovenj Gradec to Oildale (California) | 6,098.71 mi (9,814.92 km) |
| Slovenj Gradec to Ojus (Florida) | 5,172.96 mi (8,325.08 km) |
| Slovenj Gradec to Okemos (Michigan) | 4,551.90 mi (7,325.58 km) |
| Slovenj Gradec to Oklahoma City (Oklahoma) | 5,398.57 mi (8,688.16 km) |
| Slovenj Gradec to Okmulgee (Oklahoma) | 5,335.56 mi (8,586.75 km) |
| Slovenj Gradec to Olathe (Kansas) | 5,123.49 mi (8,245.46 km) |
| Slovenj Gradec to Old Jamestown (Missouri) | 4,958.33 mi (7,979.67 km) |
| Slovenj Gradec to Oldsmar (Florida) | 5,180.17 mi (8,336.68 km) |
| Slovenj Gradec to Olean (New York) | 4,348.69 mi (6,998.55 km) |
| Slovenj Gradec to Olive Branch (Mississippi) | 5,134.31 mi (8,262.87 km) |
| Slovenj Gradec to Olivehurst (California) | 5,945.27 mi (9,567.99 km) |
| Slovenj Gradec to Olney (Maryland) | 4,423.72 mi (7,119.29 km) |
| Slovenj Gradec to Olympia (Washington) | 5,491.68 mi (8,838.01 km) |
