| Oslo to Olympia Heights (Florida) | 4,730.50 mi (7,613.00 km) |
| Oslo to Omaha (Nebraska) | 4,318.15 mi (6,949.38 km) |
| Oslo to On Top of the World Designated Place (Florida) | 4,598.94 mi (7,401.27 km) |
| Oslo to Onalaska (Wisconsin) | 4,030.03 mi (6,485.71 km) |
| Oslo to Oneida (New York) | 3,601.47 mi (5,796.00 km) |
| Oslo to Oneonta (New York) | 3,615.62 mi (5,818.78 km) |
| Oslo to Ontario (California) | 5,313.39 mi (8,551.08 km) |
| Oslo to Ontario (Oregon) | 4,671.67 mi (7,518.33 km) |
| Oslo to Opa-locka (Florida) | 4,717.47 mi (7,592.03 km) |
| Oslo to Opelika (Alabama) | 4,493.78 mi (7,232.04 km) |
| Oslo to Opelousas (Louisiana) | 4,829.61 mi (7,772.51 km) |
| Oslo to Orange (California) | 5,333.26 mi (8,583.06 km) |
| Oslo to Orange (Texas) | 4,905.19 mi (7,894.14 km) |
| Oslo to Orange City (Florida) | 4,575.86 mi (7,364.13 km) |
| Oslo to Orangeburg (South Carolina) | 4,300.38 mi (6,920.80 km) |
