| Duncan to Nuth | 4,944.78 mi (7,957.85 km) |
| Duncan to Oegstgeest | 4,846.89 mi (7,800.32 km) |
| Duncan to Oirschot | 4,901.92 mi (7,888.88 km) |
| Duncan to Oisterwijk | 4,895.23 mi (7,878.11 km) |
| Duncan to Oldebroek | 4,888.76 mi (7,867.70 km) |
| Duncan to Oldenzaal | 4,930.47 mi (7,934.83 km) |
| Duncan to Ommen | 4,904.69 mi (7,893.33 km) |
| Duncan to Oosterend | 4,874.36 mi (7,844.52 km) |
| Duncan to Oosterhout | 4,880.54 mi (7,854.47 km) |
| Duncan to Oosterwolde | 4,882.77 mi (7,858.06 km) |
| Duncan to Oostzaan | 4,852.96 mi (7,810.08 km) |
| Duncan to Opmeer | 4,845.75 mi (7,798.48 km) |
| Duncan to Oss | 4,900.04 mi (7,885.85 km) |
| Duncan to Oud-Beijerland | 4,857.60 mi (7,817.55 km) |
| Duncan to Oudenbosch | 4,870.31 mi (7,838.00 km) |
