| Buffalo Grove to Octeville | 3,949.57 mi (6,356.21 km) |
| Buffalo Grove to Oignies | 4,100.20 mi (6,598.63 km) |
| Buffalo Grove to Oissel | 4,066.34 mi (6,544.14 km) |
| Buffalo Grove to Olivet | 4,150.16 mi (6,679.04 km) |
| Buffalo Grove to Ollioules | 4,488.98 mi (7,224.31 km) |
| Buffalo Grove to Olonne-sur-Mer | 4,048.33 mi (6,515.16 km) |
| Buffalo Grove to Oloron-Sainte-Marie | 4,216.43 mi (6,785.69 km) |
| Buffalo Grove to Onet Village | 4,307.10 mi (6,931.61 km) |
| Buffalo Grove to Onnaing | 4,125.95 mi (6,640.07 km) |
| Buffalo Grove to Orange | 4,406.98 mi (7,092.35 km) |
| Buffalo Grove to Orchies | 4,109.49 mi (6,613.59 km) |
| Buffalo Grove to Orleans | 4,149.11 mi (6,677.35 km) |
| Buffalo Grove to Orly | 4,138.09 mi (6,659.62 km) |
| Buffalo Grove to Ormesson-sur-Marne | 4,142.27 mi (6,666.35 km) |
| Buffalo Grove to Orsay | 4,131.70 mi (6,649.33 km) |
