| Mercer Island to Nuth | 4,969.24 mi (7,997.22 km) |
| Mercer Island to Oegstgeest | 4,862.65 mi (7,825.68 km) |
| Mercer Island to Oirschot | 4,921.72 mi (7,920.74 km) |
| Mercer Island to Oisterwijk | 4,914.54 mi (7,909.19 km) |
| Mercer Island to Oldebroek | 4,881.90 mi (7,856.67 km) |
| Mercer Island to Oldenzaal | 4,913.85 mi (7,908.08 km) |
| Mercer Island to Ommen | 4,890.27 mi (7,870.13 km) |
| Mercer Island to Oosterend | 4,854.20 mi (7,812.08 km) |
| Mercer Island to Oosterhout | 4,902.78 mi (7,890.26 km) |
| Mercer Island to Oosterwolde | 4,860.21 mi (7,821.76 km) |
| Mercer Island to Oostzaan | 4,858.58 mi (7,819.12 km) |
| Mercer Island to Opmeer | 4,845.06 mi (7,797.37 km) |
| Mercer Island to Oss | 4,911.75 mi (7,904.71 km) |
| Mercer Island to Oud-Beijerland | 4,881.76 mi (7,856.44 km) |
| Mercer Island to Oudenbosch | 4,897.69 mi (7,882.06 km) |
