| Dartford to Oswego (Illinois) | 3,998.94 mi (6,435.67 km) |
| Dartford to Oswego (New York) | 3,460.15 mi (5,568.57 km) |
| Dartford to Otsego (Minnesota) | 4,025.19 mi (6,477.91 km) |
| Dartford to Ottawa (Illinois) | 4,032.89 mi (6,490.31 km) |
| Dartford to Ottawa (Kansas) | 4,409.11 mi (7,095.77 km) |
| Dartford to Ottumwa (Iowa) | 4,184.07 mi (6,733.62 km) |
| Dartford to Overland (Missouri) | 4,218.92 mi (6,789.69 km) |
| Dartford to Overland Park (Kansas) | 4,373.25 mi (7,038.07 km) |
| Dartford to Overlea (Maryland) | 3,638.61 mi (5,855.78 km) |
| Dartford to Oviedo (Florida) | 4,340.68 mi (6,985.64 km) |
| Dartford to Owasso (Oklahoma) | 4,546.75 mi (7,317.28 km) |
| Dartford to Owatonna (Minnesota) | 4,066.81 mi (6,544.90 km) |
| Dartford to Owensboro (Kentucky) | 4,137.81 mi (6,659.16 km) |
| Dartford to Owings Mills (Maryland) | 3,647.65 mi (5,870.33 km) |
| Dartford to Owosso (Michigan) | 3,779.84 mi (6,083.06 km) |
