| Gig Harbor to Orbetello | 5,622.41 mi (9,048.39 km) |
| Gig Harbor to Oria | 5,895.53 mi (9,487.95 km) |
| Gig Harbor to Oristano | 5,704.76 mi (9,180.92 km) |
| Gig Harbor to Orta Nova | 5,799.54 mi (9,333.45 km) |
| Gig Harbor to Orte | 5,650.43 mi (9,093.50 km) |
| Gig Harbor to Ortona | 5,705.97 mi (9,182.87 km) |
| Gig Harbor to Orvieto | 5,628.04 mi (9,057.45 km) |
| Gig Harbor to Orzinuovi | 5,413.55 mi (8,712.27 km) |
| Gig Harbor to Osimo | 5,615.05 mi (9,036.55 km) |
| Gig Harbor to Ospitaletto | 5,407.77 mi (8,702.97 km) |
| Gig Harbor to Ostuni | 5,879.88 mi (9,462.75 km) |
| Gig Harbor to Ottaviano | 5,799.58 mi (9,333.52 km) |
| Gig Harbor to Ovada | 5,426.24 mi (8,732.70 km) |
| Gig Harbor to Ozieri | 5,675.62 mi (9,134.02 km) |
| Gig Harbor to Paceco | 5,925.69 mi (9,536.48 km) |
