| Tacoma to Orbetello | 5,624.14 mi (9,051.18 km) |
| Tacoma to Oria | 5,897.80 mi (9,491.60 km) |
| Tacoma to Oristano | 5,706.01 mi (9,182.94 km) |
| Tacoma to Orta Nova | 5,801.66 mi (9,336.87 km) |
| Tacoma to Orte | 5,652.29 mi (9,096.49 km) |
| Tacoma to Ortona | 5,708.03 mi (9,186.19 km) |
| Tacoma to Orvieto | 5,629.89 mi (9,060.43 km) |
| Tacoma to Orzinuovi | 5,415.40 mi (8,715.24 km) |
| Tacoma to Osimo | 5,617.10 mi (9,039.85 km) |
| Tacoma to Ospitaletto | 5,409.65 mi (8,705.99 km) |
| Tacoma to Ostuni | 5,882.16 mi (9,466.42 km) |
| Tacoma to Ottaviano | 5,801.54 mi (9,336.67 km) |
| Tacoma to Ovada | 5,427.90 mi (8,735.37 km) |
| Tacoma to Ozieri | 5,676.97 mi (9,136.21 km) |
| Tacoma to Paceco | 5,927.22 mi (9,538.94 km) |
