| Opelika to Oerlinghausen | 4,638.86 mi (7,465.52 km) |
| Opelika to Oestrich-Winkel | 4,668.71 mi (7,513.57 km) |
| Opelika to Offenburg | 4,710.54 mi (7,580.88 km) |
| Opelika to Oftersheim | 4,710.74 mi (7,581.20 km) |
| Opelika to Ohrdruf | 4,752.94 mi (7,649.12 km) |
| Opelika to Ohringen | 4,753.04 mi (7,649.28 km) |
| Opelika to Olbernhau | 4,859.29 mi (7,820.27 km) |
| Opelika to Olching | 4,858.06 mi (7,818.29 km) |
| Opelika to Oldenburg | 4,588.49 mi (7,384.46 km) |
| Opelika to Oldenburg in Holstein | 4,655.21 mi (7,491.83 km) |
| Opelika to Olfen | 4,595.78 mi (7,396.19 km) |
| Opelika to Olpe | 4,633.07 mi (7,456.20 km) |
| Opelika to Olsberg | 4,649.27 mi (7,482.28 km) |
| Opelika to Oranienburg | 4,788.95 mi (7,707.07 km) |
| Opelika to Ortenberg | 4,700.73 mi (7,565.09 km) |
