| McKeesport to Octeville | 3,699.89 mi (5,954.40 km) |
| McKeesport to Oignies | 3,866.45 mi (6,222.45 km) |
| McKeesport to Oissel | 3,820.65 mi (6,148.74 km) |
| McKeesport to Olivet | 3,896.51 mi (6,270.83 km) |
| McKeesport to Ollioules | 4,216.42 mi (6,785.67 km) |
| McKeesport to Olonne-sur-Mer | 3,777.63 mi (6,079.52 km) |
| McKeesport to Oloron-Sainte-Marie | 3,927.84 mi (6,321.24 km) |
| McKeesport to Onet Village | 4,033.32 mi (6,491.01 km) |
| McKeesport to Onnaing | 3,893.01 mi (6,265.19 km) |
| McKeesport to Orange | 4,137.49 mi (6,658.64 km) |
| McKeesport to Orchies | 3,876.35 mi (6,238.37 km) |
| McKeesport to Orleans | 3,895.74 mi (6,269.58 km) |
| McKeesport to Orly | 3,891.37 mi (6,262.55 km) |
| McKeesport to Ormesson-sur-Marne | 3,896.16 mi (6,270.27 km) |
| McKeesport to Orsay | 3,884.20 mi (6,251.01 km) |
