| Mercer Island to Noventa Vicentina | 5,437.13 mi (8,750.22 km) |
| Mercer Island to Novi di Modena | 5,445.07 mi (8,762.99 km) |
| Mercer Island to Novi Ligure | 5,400.05 mi (8,690.54 km) |
| Mercer Island to Nuoro | 5,677.57 mi (9,137.17 km) |
| Mercer Island to Occhiobello | 5,459.99 mi (8,787.00 km) |
| Mercer Island to Oderzo | 5,430.12 mi (8,738.94 km) |
| Mercer Island to Oggiono | 5,353.78 mi (8,616.08 km) |
| Mercer Island to Olbia | 5,646.34 mi (9,086.91 km) |
| Mercer Island to Oleggio | 5,346.62 mi (8,604.55 km) |
| Mercer Island to Olgiate Comasco | 5,344.20 mi (8,600.67 km) |
| Mercer Island to Olgiate Olona | 5,350.96 mi (8,611.54 km) |
| Mercer Island to Omegna | 5,324.53 mi (8,569.00 km) |
| Mercer Island to Opera | 5,374.10 mi (8,648.78 km) |
| Mercer Island to Oppeano | 5,427.65 mi (8,734.96 km) |
| Mercer Island to Orbassano | 5,353.33 mi (8,615.36 km) |
