| Howard to Orbetello | 4,638.58 mi (7,465.07 km) |
| Howard to Oria | 4,975.00 mi (8,006.49 km) |
| Howard to Oristano | 4,646.99 mi (7,478.60 km) |
| Howard to Orta Nova | 4,862.61 mi (7,825.61 km) |
| Howard to Orte | 4,683.10 mi (7,536.72 km) |
| Howard to Ortona | 4,765.29 mi (7,669.00 km) |
| Howard to Orvieto | 4,660.84 mi (7,500.90 km) |
| Howard to Orzinuovi | 4,459.43 mi (7,176.76 km) |
| Howard to Osimo | 4,678.70 mi (7,529.64 km) |
| Howard to Ospitaletto | 4,458.03 mi (7,174.50 km) |
| Howard to Ostuni | 4,961.95 mi (7,985.48 km) |
| Howard to Ottaviano | 4,837.69 mi (7,785.51 km) |
| Howard to Ovada | 4,442.88 mi (7,150.13 km) |
| Howard to Ozieri | 4,633.56 mi (7,457.00 km) |
| Howard to Paceco | 4,894.60 mi (7,877.10 km) |
