| Castellana Grotte to Oegstgeest | 983.89 mi (1,583.43 km) |
| Castellana Grotte to Oirschot | 925.04 mi (1,488.71 km) |
| Castellana Grotte to Oisterwijk | 932.19 mi (1,500.21 km) |
| Castellana Grotte to Oldebroek | 958.82 mi (1,543.07 km) |
| Castellana Grotte to Oldenzaal | 925.37 mi (1,489.25 km) |
| Castellana Grotte to Ommen | 949.34 mi (1,527.81 km) |
| Castellana Grotte to Oosterend | 985.12 mi (1,585.40 km) |
| Castellana Grotte to Oosterhout | 945.19 mi (1,521.14 km) |
| Castellana Grotte to Oosterwolde | 978.88 mi (1,575.36 km) |
| Castellana Grotte to Oostzaan | 985.11 mi (1,585.38 km) |
| Castellana Grotte to Opmeer | 997.34 mi (1,605.06 km) |
| Castellana Grotte to Oss | 932.68 mi (1,501.00 km) |
| Castellana Grotte to Oud-Beijerland | 967.34 mi (1,556.78 km) |
| Castellana Grotte to Oudenbosch | 952.32 mi (1,532.61 km) |
| Castellana Grotte to Oudewater | 963.96 mi (1,551.35 km) |
