| Half Moon Bay to Orbetello | 6,193.87 mi (9,968.08 km) |
| Half Moon Bay to Oria | 6,486.75 mi (10,439.41 km) |
| Half Moon Bay to Oristano | 6,255.67 mi (10,067.53 km) |
| Half Moon Bay to Orta Nova | 6,385.52 mi (10,276.50 km) |
| Half Moon Bay to Orte | 6,226.71 mi (10,020.92 km) |
| Half Moon Bay to Ortona | 6,289.88 mi (10,122.58 km) |
| Half Moon Bay to Orvieto | 6,204.08 mi (9,984.50 km) |
| Half Moon Bay to Orzinuovi | 5,990.38 mi (9,640.59 km) |
| Half Moon Bay to Osimo | 6,198.96 mi (9,976.26 km) |
| Half Moon Bay to Ospitaletto | 5,985.67 mi (9,633.01 km) |
| Half Moon Bay to Ostuni | 6,471.55 mi (10,414.96 km) |
| Half Moon Bay to Ottaviano | 6,379.10 mi (10,266.16 km) |
| Half Moon Bay to Ovada | 5,995.41 mi (9,648.68 km) |
| Half Moon Bay to Ozieri | 6,230.98 mi (10,027.80 km) |
| Half Moon Bay to Paceco | 6,487.31 mi (10,440.31 km) |
