| Campton Hills to Orbetello | 4,763.54 mi (7,666.17 km) |
| Campton Hills to Oria | 5,104.05 mi (8,214.18 km) |
| Campton Hills to Oristano | 4,763.75 mi (7,666.51 km) |
| Campton Hills to Orta Nova | 4,990.80 mi (8,031.92 km) |
| Campton Hills to Orte | 4,809.46 mi (7,740.08 km) |
| Campton Hills to Ortona | 4,893.77 mi (7,875.77 km) |
| Campton Hills to Orvieto | 4,787.37 mi (7,704.52 km) |
| Campton Hills to Orzinuovi | 4,588.70 mi (7,384.80 km) |
| Campton Hills to Osimo | 4,808.20 mi (7,738.05 km) |
| Campton Hills to Ospitaletto | 4,587.75 mi (7,383.26 km) |
| Campton Hills to Ostuni | 5,091.34 mi (8,193.72 km) |
| Campton Hills to Ottaviano | 4,963.54 mi (7,988.05 km) |
| Campton Hills to Ovada | 4,569.28 mi (7,353.55 km) |
| Campton Hills to Ozieri | 4,752.22 mi (7,647.96 km) |
| Campton Hills to Paceco | 5,012.67 mi (8,067.11 km) |
