| Highland Park to Oerlinghausen | 4,248.15 mi (6,836.74 km) |
| Highland Park to Oestrich-Winkel | 4,298.56 mi (6,917.87 km) |
| Highland Park to Offenburg | 4,355.11 mi (7,008.88 km) |
| Highland Park to Oftersheim | 4,344.50 mi (6,991.80 km) |
| Highland Park to Ohrdruf | 4,365.96 mi (7,026.33 km) |
| Highland Park to Ohringen | 4,385.18 mi (7,057.27 km) |
| Highland Park to Olbernhau | 4,464.87 mi (7,185.52 km) |
| Highland Park to Olching | 4,492.74 mi (7,230.37 km) |
| Highland Park to Oldenburg | 4,188.24 mi (6,740.31 km) |
| Highland Park to Oldenburg in Holstein | 4,236.67 mi (6,818.25 km) |
| Highland Park to Olfen | 4,211.41 mi (6,777.62 km) |
| Highland Park to Olpe | 4,253.89 mi (6,845.97 km) |
| Highland Park to Olsberg | 4,264.88 mi (6,863.66 km) |
| Highland Park to Oranienburg | 4,376.78 mi (7,043.75 km) |
| Highland Park to Ortenberg | 4,323.70 mi (6,958.32 km) |
