| Portland to Oschatz | 5,245.64 mi (8,442.04 km) |
| Portland to Oschersleben | 5,162.29 mi (8,307.90 km) |
| Portland to Osnabruck | 5,073.69 mi (8,165.32 km) |
| Portland to Ostbevern | 5,082.94 mi (8,180.20 km) |
| Portland to Osterburg | 5,128.46 mi (8,253.45 km) |
| Portland to Ostercappeln | 5,074.14 mi (8,166.03 km) |
| Portland to Osterhofen | 5,398.97 mi (8,688.81 km) |
| Portland to Osterholz-Scharmbeck | 5,037.20 mi (8,106.60 km) |
| Portland to Osternienburg | 5,192.06 mi (8,355.81 km) |
| Portland to Osterode | 5,156.74 mi (8,298.97 km) |
| Portland to Osterwieck | 5,153.30 mi (8,293.43 km) |
| Portland to Ostfildern | 5,308.11 mi (8,542.58 km) |
| Portland to Osthofen | 5,229.00 mi (8,415.26 km) |
| Portland to Ostrhauderfehn | 5,015.76 mi (8,072.09 km) |
| Portland to Ostringen | 5,266.64 mi (8,475.84 km) |
