| Circleville to Oerlinghausen | 4,196.24 mi (6,753.20 km) |
| Circleville to Oestrich-Winkel | 4,235.11 mi (6,815.75 km) |
| Circleville to Offenburg | 4,283.69 mi (6,893.93 km) |
| Circleville to Oftersheim | 4,279.00 mi (6,886.39 km) |
| Circleville to Ohrdruf | 4,312.24 mi (6,939.88 km) |
| Circleville to Ohringen | 4,320.71 mi (6,953.50 km) |
| Circleville to Olbernhau | 4,415.72 mi (7,106.41 km) |
| Circleville to Olching | 4,427.17 mi (7,124.85 km) |
| Circleville to Oldenburg | 4,141.73 mi (6,665.47 km) |
| Circleville to Oldenburg in Holstein | 4,201.22 mi (6,761.21 km) |
| Circleville to Olfen | 4,155.75 mi (6,688.03 km) |
| Circleville to Olpe | 4,195.39 mi (6,751.82 km) |
| Circleville to Olsberg | 4,209.38 mi (6,774.35 km) |
| Circleville to Oranienburg | 4,337.86 mi (6,981.10 km) |
| Circleville to Ortenberg | 4,264.19 mi (6,862.54 km) |
