| Westerville to Oerlinghausen | 4,170.48 mi (6,711.75 km) |
| Westerville to Oestrich-Winkel | 4,210.33 mi (6,775.87 km) |
| Westerville to Offenburg | 4,259.62 mi (6,855.19 km) |
| Westerville to Oftersheim | 4,254.41 mi (6,846.81 km) |
| Westerville to Ohrdruf | 4,286.66 mi (6,898.72 km) |
| Westerville to Ohringen | 4,296.04 mi (6,913.81 km) |
| Westerville to Olbernhau | 4,389.80 mi (7,064.70 km) |
| Westerville to Olching | 4,402.63 mi (7,085.35 km) |
| Westerville to Oldenburg | 4,115.52 mi (6,623.29 km) |
| Westerville to Oldenburg in Holstein | 4,174.16 mi (6,717.67 km) |
| Westerville to Olfen | 4,130.29 mi (6,647.05 km) |
| Westerville to Olpe | 4,170.18 mi (6,711.25 km) |
| Westerville to Olsberg | 4,183.93 mi (6,733.38 km) |
| Westerville to Oranienburg | 4,311.11 mi (6,938.06 km) |
| Westerville to Ortenberg | 4,239.08 mi (6,822.14 km) |
