| Trondheim to Olympia Heights (Florida) | 4,662.24 mi (7,503.15 km) |
| Trondheim to Omaha (Nebraska) | 4,169.93 mi (6,710.86 km) |
| Trondheim to On Top of the World Designated Place (Florida) | 4,516.54 mi (7,268.66 km) |
| Trondheim to Onalaska (Wisconsin) | 3,888.20 mi (6,257.45 km) |
| Trondheim to Oneida (New York) | 3,503.33 mi (5,638.06 km) |
| Trondheim to Oneonta (New York) | 3,521.09 mi (5,666.64 km) |
| Trondheim to Ontario (California) | 5,126.03 mi (8,249.56 km) |
| Trondheim to Ontario (Oregon) | 4,474.63 mi (7,201.21 km) |
| Trondheim to Opa-locka (Florida) | 4,649.10 mi (7,482.00 km) |
| Trondheim to Opelika (Alabama) | 4,393.54 mi (7,070.73 km) |
| Trondheim to Opelousas (Louisiana) | 4,713.54 mi (7,585.71 km) |
| Trondheim to Orange (California) | 5,145.69 mi (8,281.19 km) |
| Trondheim to Orange (Texas) | 4,784.91 mi (7,700.57 km) |
| Trondheim to Orange City (Florida) | 4,497.12 mi (7,237.42 km) |
| Trondheim to Orangeburg (South Carolina) | 4,212.26 mi (6,778.98 km) |
