| Cities | Distance |
|---|---|
| Portici to Oegstgeest | 913.00 mi (1,469.34 km) |
| Portici to Oirschot | 853.96 mi (1,374.32 km) |
| Portici to Oisterwijk | 861.14 mi (1,385.87 km) |
| Portici to Oldebroek | 896.41 mi (1,442.63 km) |
| Portici to Oldenzaal | 867.72 mi (1,396.46 km) |
| Portici to Ommen | 889.98 mi (1,432.28 km) |
| Portici to Oosterend | 926.56 mi (1,491.15 km) |
| Portici to Oosterhout | 872.85 mi (1,404.71 km) |
| Portici to Oosterwolde | 921.40 mi (1,482.85 km) |
| Portici to Oostzaan | 917.62 mi (1,476.76 km) |
| Portici to Opmeer | 931.68 mi (1,499.39 km) |
| Portici to Oss | 864.33 mi (1,391.01 km) |
| Portici to Oud-Beijerland | 893.92 mi (1,438.63 km) |
| Portici to Oudenbosch | 878.07 mi (1,413.12 km) |
| Portici to Oudewater | 893.94 mi (1,438.66 km) |