| Ballincollig to Oegstgeest | 554.56 mi (892.48 km) |
| Ballincollig to Oirschot | 594.55 mi (956.84 km) |
| Ballincollig to Oisterwijk | 589.52 mi (948.74 km) |
| Ballincollig to Oldebroek | 614.21 mi (988.48 km) |
| Ballincollig to Oldenzaal | 658.19 mi (1,059.26 km) |
| Ballincollig to Ommen | 635.77 mi (1,023.17 km) |
| Ballincollig to Oosterend | 620.88 mi (999.22 km) |
| Ballincollig to Oosterhout | 574.40 mi (924.40 km) |
| Ballincollig to Oosterwolde | 630.22 mi (1,014.24 km) |
| Ballincollig to Oostzaan | 571.45 mi (919.66 km) |
| Ballincollig to Opmeer | 574.03 mi (923.82 km) |
| Ballincollig to Oss | 601.47 mi (967.97 km) |
| Ballincollig to Oud-Beijerland | 553.65 mi (891.01 km) |
| Ballincollig to Oudenbosch | 560.68 mi (902.33 km) |
| Ballincollig to Oudewater | 572.25 mi (920.95 km) |
