| Downers Grove to Octeville | 3,968.24 mi (6,386.27 km) |
| Downers Grove to Oignies | 4,119.66 mi (6,629.96 km) |
| Downers Grove to Oissel | 4,085.24 mi (6,574.56 km) |
| Downers Grove to Olivet | 4,168.70 mi (6,708.87 km) |
| Downers Grove to Ollioules | 4,506.63 mi (7,252.71 km) |
| Downers Grove to Olonne-sur-Mer | 4,065.96 mi (6,543.54 km) |
| Downers Grove to Oloron-Sainte-Marie | 4,233.11 mi (6,812.54 km) |
| Downers Grove to Onet Village | 4,324.64 mi (6,959.84 km) |
| Downers Grove to Onnaing | 4,145.46 mi (6,671.47 km) |
| Downers Grove to Orange | 4,424.77 mi (7,120.99 km) |
| Downers Grove to Orchies | 4,128.99 mi (6,644.96 km) |
| Downers Grove to Orleans | 4,167.66 mi (6,707.21 km) |
| Downers Grove to Orly | 4,156.97 mi (6,689.99 km) |
| Downers Grove to Ormesson-sur-Marne | 4,161.18 mi (6,696.77 km) |
| Downers Grove to Orsay | 4,150.54 mi (6,679.64 km) |
