| Keystone to Oerlinghausen | 4,763.22 mi (7,665.67 km) |
| Keystone to Oestrich-Winkel | 4,780.66 mi (7,693.72 km) |
| Keystone to Offenburg | 4,813.41 mi (7,746.43 km) |
| Keystone to Oftersheim | 4,819.92 mi (7,756.90 km) |
| Keystone to Ohrdruf | 4,873.86 mi (7,843.72 km) |
| Keystone to Ohringen | 4,862.69 mi (7,825.75 km) |
| Keystone to Olbernhau | 4,983.50 mi (8,020.16 km) |
| Keystone to Olching | 4,965.06 mi (7,990.49 km) |
| Keystone to Oldenburg | 4,719.06 mi (7,594.60 km) |
| Keystone to Oldenburg in Holstein | 4,795.99 mi (7,718.40 km) |
| Keystone to Olfen | 4,716.88 mi (7,591.09 km) |
| Keystone to Olpe | 4,750.71 mi (7,645.53 km) |
| Keystone to Olsberg | 4,769.80 mi (7,676.24 km) |
| Keystone to Oranienburg | 4,924.52 mi (7,925.24 km) |
| Keystone to Ortenberg | 4,816.35 mi (7,751.16 km) |
