| Johnston to Orbetello | 4,983.99 mi (8,020.96 km) |
| Johnston to Oria | 5,319.30 mi (8,560.59 km) |
| Johnston to Oristano | 4,993.45 mi (8,036.19 km) |
| Johnston to Orta Nova | 5,207.18 mi (8,380.15 km) |
| Johnston to Orte | 5,028.19 mi (8,092.10 km) |
| Johnston to Ortona | 5,109.81 mi (8,223.44 km) |
| Johnston to Orvieto | 5,005.90 mi (8,056.21 km) |
| Johnston to Orzinuovi | 4,803.78 mi (7,730.94 km) |
| Johnston to Osimo | 5,022.93 mi (8,083.62 km) |
| Johnston to Ospitaletto | 4,802.25 mi (7,728.47 km) |
| Johnston to Ostuni | 5,306.14 mi (8,539.41 km) |
| Johnston to Ottaviano | 5,182.87 mi (8,341.03 km) |
| Johnston to Ovada | 4,788.01 mi (7,705.56 km) |
| Johnston to Ozieri | 4,979.90 mi (8,014.38 km) |
| Johnston to Paceco | 5,240.98 mi (8,434.53 km) |
