| Hilliard to Oerlinghausen | 4,183.68 mi (6,732.98 km) |
| Hilliard to Oestrich-Winkel | 4,223.69 mi (6,797.37 km) |
| Hilliard to Offenburg | 4,273.08 mi (6,876.85 km) |
| Hilliard to Oftersheim | 4,267.80 mi (6,868.36 km) |
| Hilliard to Ohrdruf | 4,299.89 mi (6,920.01 km) |
| Hilliard to Ohringen | 4,309.41 mi (6,935.33 km) |
| Hilliard to Olbernhau | 4,402.96 mi (7,085.89 km) |
| Hilliard to Olching | 4,416.02 mi (7,106.90 km) |
| Hilliard to Oldenburg | 4,128.63 mi (6,644.39 km) |
| Hilliard to Oldenburg in Holstein | 4,187.10 mi (6,738.48 km) |
| Hilliard to Olfen | 4,143.54 mi (6,668.38 km) |
| Hilliard to Olpe | 4,183.47 mi (6,732.64 km) |
| Hilliard to Olsberg | 4,197.17 mi (6,754.70 km) |
| Hilliard to Oranienburg | 4,324.11 mi (6,958.98 km) |
| Hilliard to Ortenberg | 4,252.39 mi (6,843.56 km) |
