| Carol Stream to Orbetello | 4,753.44 mi (7,649.92 km) |
| Carol Stream to Oria | 5,094.28 mi (8,198.45 km) |
| Carol Stream to Oristano | 4,753.01 mi (7,649.24 km) |
| Carol Stream to Orta Nova | 4,980.96 mi (8,016.09 km) |
| Carol Stream to Orte | 4,799.48 mi (7,724.01 km) |
| Carol Stream to Ortona | 4,883.97 mi (7,859.98 km) |
| Carol Stream to Orvieto | 4,777.40 mi (7,688.48 km) |
| Carol Stream to Orzinuovi | 4,578.98 mi (7,369.15 km) |
| Carol Stream to Osimo | 4,798.49 mi (7,722.42 km) |
| Carol Stream to Ospitaletto | 4,578.06 mi (7,367.68 km) |
| Carol Stream to Ostuni | 5,081.60 mi (8,178.04 km) |
| Carol Stream to Ottaviano | 4,953.51 mi (7,971.90 km) |
| Carol Stream to Ovada | 4,559.32 mi (7,337.51 km) |
| Carol Stream to Ozieri | 4,741.63 mi (7,630.91 km) |
| Carol Stream to Paceco | 5,002.01 mi (8,049.96 km) |
