| Howard to Oerlinghausen | 4,140.57 mi (6,663.60 km) |
| Howard to Oestrich-Winkel | 4,195.72 mi (6,752.36 km) |
| Howard to Offenburg | 4,255.60 mi (6,848.72 km) |
| Howard to Oftersheim | 4,242.43 mi (6,827.53 km) |
| Howard to Ohrdruf | 4,258.86 mi (6,853.97 km) |
| Howard to Ohringen | 4,282.58 mi (6,892.14 km) |
| Howard to Olbernhau | 4,355.68 mi (7,009.79 km) |
| Howard to Olching | 4,390.36 mi (7,065.61 km) |
| Howard to Oldenburg | 4,078.58 mi (6,563.83 km) |
| Howard to Oldenburg in Holstein | 4,122.49 mi (6,634.50 km) |
| Howard to Olfen | 4,105.48 mi (6,607.13 km) |
| Howard to Olpe | 4,149.04 mi (6,677.24 km) |
| Howard to Olsberg | 4,158.74 mi (6,692.85 km) |
| Howard to Oranienburg | 4,263.68 mi (6,861.72 km) |
| Howard to Ortenberg | 4,219.12 mi (6,790.02 km) |
