| Gilbert to Nuth | 5,494.10 mi (8,841.90 km) |
| Gilbert to Oegstgeest | 5,390.96 mi (8,675.91 km) |
| Gilbert to Oirschot | 5,448.63 mi (8,768.72 km) |
| Gilbert to Oisterwijk | 5,441.62 mi (8,757.44 km) |
| Gilbert to Oldebroek | 5,425.07 mi (8,730.81 km) |
| Gilbert to Oldenzaal | 5,463.88 mi (8,793.27 km) |
| Gilbert to Ommen | 5,438.42 mi (8,752.29 km) |
| Gilbert to Oosterend | 5,405.26 mi (8,698.92 km) |
| Gilbert to Oosterhout | 5,427.74 mi (8,735.10 km) |
| Gilbert to Oosterwolde | 5,412.92 mi (8,711.25 km) |
| Gilbert to Oostzaan | 5,393.30 mi (8,679.68 km) |
| Gilbert to Opmeer | 5,383.54 mi (8,663.97 km) |
| Gilbert to Oss | 5,443.65 mi (8,760.71 km) |
| Gilbert to Oud-Beijerland | 5,405.06 mi (8,698.60 km) |
| Gilbert to Oudenbosch | 5,419.23 mi (8,721.41 km) |
