| Opfikon to Oakley (California) | 5,786.74 mi (9,312.85 km) |
| Opfikon to Oakton (Virginia) | 4,144.17 mi (6,669.40 km) |
| Opfikon to Oakville (Missouri) | 4,691.91 mi (7,550.91 km) |
| Opfikon to Oatfield (Oregon) | 5,372.85 mi (8,646.76 km) |
| Opfikon to Ocala (Florida) | 4,795.85 mi (7,718.18 km) |
| Opfikon to Ocean Acres (New Jersey) | 3,980.67 mi (6,406.26 km) |
| Opfikon to Ocean City (New Jersey) | 4,014.25 mi (6,460.31 km) |
| Opfikon to Ocean Pines (Maryland) | 4,075.01 mi (6,558.09 km) |
| Opfikon to Ocean Pointe (Hawaii) | 7,614.12 mi (12,253.74 km) |
| Opfikon to Ocean Springs (Mississippi) | 5,020.00 mi (8,078.91 km) |
| Opfikon to Oceanside (California) | 5,933.39 mi (9,548.87 km) |
| Opfikon to Oceanside (New York) | 3,916.51 mi (6,303.01 km) |
| Opfikon to Ocoee (Florida) | 4,797.43 mi (7,720.71 km) |
| Opfikon to Oconomowoc (Wisconsin) | 4,403.76 mi (7,087.17 km) |
| Opfikon to Odenton (Maryland) | 4,111.03 mi (6,616.06 km) |
