| Pembroke Dock to Oswego (Illinois) | 3,792.68 mi (6,103.73 km) |
| Pembroke Dock to Oswego (New York) | 3,247.09 mi (5,225.69 km) |
| Pembroke Dock to Otsego (Minnesota) | 3,829.26 mi (6,162.60 km) |
| Pembroke Dock to Ottawa (Illinois) | 3,826.64 mi (6,158.37 km) |
| Pembroke Dock to Ottawa (Kansas) | 4,205.36 mi (6,767.88 km) |
| Pembroke Dock to Ottumwa (Iowa) | 3,980.67 mi (6,406.27 km) |
| Pembroke Dock to Overland (Missouri) | 4,010.77 mi (6,454.72 km) |
| Pembroke Dock to Overland Park (Kansas) | 4,169.30 mi (6,709.84 km) |
| Pembroke Dock to Overlea (Maryland) | 3,421.45 mi (5,506.29 km) |
| Pembroke Dock to Oviedo (Florida) | 4,119.52 mi (6,629.73 km) |
| Pembroke Dock to Owasso (Oklahoma) | 4,340.83 mi (6,985.89 km) |
| Pembroke Dock to Owatonna (Minnesota) | 3,868.62 mi (6,225.94 km) |
| Pembroke Dock to Owensboro (Kentucky) | 3,926.01 mi (6,318.30 km) |
| Pembroke Dock to Owings Mills (Maryland) | 3,430.67 mi (5,521.14 km) |
| Pembroke Dock to Owosso (Michigan) | 3,571.81 mi (5,748.27 km) |
