| Horn Lake to Octeville | 4,365.25 mi (7,025.20 km) |
| Horn Lake to Oignies | 4,527.97 mi (7,287.07 km) |
| Horn Lake to Oissel | 4,485.23 mi (7,218.28 km) |
| Horn Lake to Olivet | 4,562.91 mi (7,343.29 km) |
| Horn Lake to Ollioules | 4,885.91 mi (7,863.11 km) |
| Horn Lake to Olonne-sur-Mer | 4,446.69 mi (7,156.26 km) |
| Horn Lake to Oloron-Sainte-Marie | 4,598.26 mi (7,400.19 km) |
| Horn Lake to Onet Village | 4,702.86 mi (7,568.52 km) |
| Horn Lake to Onnaing | 4,554.33 mi (7,329.49 km) |
| Horn Lake to Orange | 4,806.60 mi (7,735.47 km) |
| Horn Lake to Orchies | 4,537.71 mi (7,302.74 km) |
| Horn Lake to Orleans | 4,562.08 mi (7,341.95 km) |
| Horn Lake to Orly | 4,556.26 mi (7,332.60 km) |
| Horn Lake to Ormesson-sur-Marne | 4,560.92 mi (7,340.10 km) |
| Horn Lake to Orsay | 4,549.27 mi (7,321.34 km) |
