| Spencer to Oerlinghausen | 4,453.18 mi (7,166.70 km) |
| Spencer to Oestrich-Winkel | 4,514.90 mi (7,266.03 km) |
| Spencer to Offenburg | 4,578.98 mi (7,369.16 km) |
| Spencer to Oftersheim | 4,562.54 mi (7,342.69 km) |
| Spencer to Ohrdruf | 4,571.90 mi (7,357.76 km) |
| Spencer to Ohringen | 4,601.88 mi (7,406.02 km) |
| Spencer to Olbernhau | 4,665.36 mi (7,508.16 km) |
| Spencer to Olching | 4,709.75 mi (7,579.61 km) |
| Spencer to Oldenburg | 4,388.21 mi (7,062.15 km) |
| Spencer to Oldenburg in Holstein | 4,424.73 mi (7,120.92 km) |
| Spencer to Olfen | 4,420.57 mi (7,114.22 km) |
| Spencer to Olpe | 4,465.57 mi (7,186.64 km) |
| Spencer to Olsberg | 4,473.43 mi (7,199.28 km) |
| Spencer to Oranienburg | 4,567.33 mi (7,350.41 km) |
| Spencer to Ortenberg | 4,535.86 mi (7,299.77 km) |
