| Haverhill to Orbetello | 834.11 mi (1,342.37 km) |
| Haverhill to Oria | 1,140.84 mi (1,836.00 km) |
| Haverhill to Oristano | 926.33 mi (1,490.78 km) |
| Haverhill to Orta Nova | 1,032.85 mi (1,662.21 km) |
| Haverhill to Orte | 866.89 mi (1,395.12 km) |
| Haverhill to Ortona | 935.63 mi (1,505.75 km) |
| Haverhill to Orvieto | 844.22 mi (1,358.65 km) |
| Haverhill to Orzinuovi | 631.55 mi (1,016.38 km) |
| Haverhill to Osimo | 845.85 mi (1,361.26 km) |
| Haverhill to Ospitaletto | 627.72 mi (1,010.22 km) |
| Haverhill to Ostuni | 1,126.80 mi (1,813.40 km) |
| Haverhill to Ottaviano | 1,020.29 mi (1,642.00 km) |
| Haverhill to Ovada | 636.52 mi (1,024.38 km) |
| Haverhill to Ozieri | 891.70 mi (1,435.06 km) |
| Haverhill to Paceco | 1,136.03 mi (1,828.27 km) |
