| Detroit to Oerlinghausen | 4,067.91 mi (6,546.67 km) |
| Detroit to Oestrich-Winkel | 4,112.39 mi (6,618.25 km) |
| Detroit to Offenburg | 4,165.00 mi (6,702.92 km) |
| Detroit to Oftersheim | 4,157.34 mi (6,690.59 km) |
| Detroit to Ohrdruf | 4,184.88 mi (6,734.91 km) |
| Detroit to Ohringen | 4,198.57 mi (6,756.95 km) |
| Detroit to Olbernhau | 4,286.30 mi (6,898.13 km) |
| Detroit to Olching | 4,305.68 mi (6,929.32 km) |
| Detroit to Oldenburg | 4,010.81 mi (6,454.78 km) |
| Detroit to Oldenburg in Holstein | 4,065.33 mi (6,542.51 km) |
| Detroit to Olfen | 4,029.17 mi (6,484.32 km) |
| Detroit to Olpe | 4,070.21 mi (6,550.37 km) |
| Detroit to Olsberg | 4,082.77 mi (6,570.59 km) |
| Detroit to Oranienburg | 4,203.66 mi (6,765.14 km) |
| Detroit to Ortenberg | 4,139.57 mi (6,661.99 km) |
