| Ashtabula to Nuth | 3,934.89 mi (6,332.59 km) |
| Ashtabula to Oegstgeest | 3,841.17 mi (6,181.76 km) |
| Ashtabula to Oirschot | 3,894.02 mi (6,266.82 km) |
| Ashtabula to Oisterwijk | 3,887.59 mi (6,256.47 km) |
| Ashtabula to Oldebroek | 3,887.29 mi (6,255.99 km) |
| Ashtabula to Oldenzaal | 3,930.30 mi (6,325.20 km) |
| Ashtabula to Ommen | 3,904.62 mi (6,283.88 km) |
| Ashtabula to Oosterend | 3,876.44 mi (6,238.52 km) |
| Ashtabula to Oosterhout | 3,872.58 mi (6,232.31 km) |
| Ashtabula to Oosterwolde | 3,885.22 mi (6,252.66 km) |
| Ashtabula to Oostzaan | 3,849.42 mi (6,195.05 km) |
| Ashtabula to Opmeer | 3,843.87 mi (6,186.12 km) |
| Ashtabula to Oss | 3,893.99 mi (6,266.78 km) |
| Ashtabula to Oud-Beijerland | 3,849.73 mi (6,195.55 km) |
| Ashtabula to Oudenbosch | 3,861.44 mi (6,214.38 km) |
