| Kirkwall to Oerlinghausen | 663.18 mi (1,067.28 km) |
| Kirkwall to Oestrich-Winkel | 758.55 mi (1,220.77 km) |
| Kirkwall to Offenburg | 849.72 mi (1,367.49 km) |
| Kirkwall to Oftersheim | 809.29 mi (1,302.42 km) |
| Kirkwall to Ohrdruf | 780.20 mi (1,255.61 km) |
| Kirkwall to Ohringen | 840.73 mi (1,353.03 km) |
| Kirkwall to Olbernhau | 862.28 mi (1,387.70 km) |
| Kirkwall to Olching | 943.36 mi (1,518.19 km) |
| Kirkwall to Oldenburg | 588.90 mi (947.75 km) |
| Kirkwall to Oldenburg in Holstein | 615.70 mi (990.87 km) |
| Kirkwall to Olfen | 644.29 mi (1,036.89 km) |
| Kirkwall to Olpe | 695.21 mi (1,118.84 km) |
| Kirkwall to Olsberg | 692.34 mi (1,114.21 km) |
| Kirkwall to Oranienburg | 758.07 mi (1,219.99 km) |
| Kirkwall to Ortenberg | 762.92 mi (1,227.80 km) |
